Chapter-7 The p-Block Elements

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  • Chapter-7 The p-Block Elements Assignments 1

    On heating compound (A) gives a gas (B) which is a constituent of air. This
    gas when treated with 3 mol of hydrogen (H2) in the presence of a catalyst
    gives another gas (C) which is basic in nature. Gas C on further oxidation in
    moist condition gives a compound (D) which is a part of acid rain. Identify
    compounds (A) to (D) and also give necessary equations of all the steps involved.
    www.tiwariacademy.

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  • Chapter-7 The p-Block Elements Assignments 2

    On heating lead (II) nitrate gives a brown gas “A”. The gas “A” on cooling
    changes to colourless solid “B”. Solid “B” on heating with NO changes to a
    blue solid ‘C’. Identify ‘A’, ‘B’ and ‘C’ and also write reactions involved and
    draw the structures of ‘B’ and ‘C’.

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  • Chapter-7 The p-Block Elements Assignments 3

    An amorphous solid “A” burns in air to form a gas “B” which turns lime water
    milky. The gas is also produced as a by-product during roasting of sulphide
    ore. This gas decolourises acidified aqueous KMnO4 solution and reduces
    Fe3+ to Fe2+. Identify the solid “A” and the gas “B” and write the reactions
    involved.

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  • Chapter-7 The p-Block Elements Assignments 4

    Phosphorus forms a number of oxoacids. Out of these oxoacids phosphinic
    acid has strong reducing property. Write its structure and also write a reaction
    showing its reducing behaviour.

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  • Chapter-7 The p-Block Elements Assignments 5

    Give an example to show the effect of concentration of nitric acid on the
    formation of oxidation product.

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  • Chapter-7 The p-Block Elements Assignments 6

    Phosphorus has three allotropic forms — (i) white phosphorus (ii) red
    phosphorus and (iii) black phosphorus. Write the difference between white
    and red phosphorus on the basis of their structure and reactivity.

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  • Chapter-7 The p-Block Elements Assignments 7

    Name three oxoacids of nitrogen. Write the disproportionation reaction of that
    oxoacid of nitrogen in which nitrogen is in +3 oxidation state.

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  • Chapter-7 The p-Block Elements Assignments 8

    White phosphorus reacts with chlorine and the product hydrolyses in the
    presence of water. Calculate the mass of HCl obtained by the hydrolysis of the
    product formed by the reaction of 62 g of white phosphorus with chlorine in
    the presence of water.

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  • Chapter-7 The p-Block Elements Assignments 9

    Explain why ozone is thermodynamically less stable than oxygen.

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  • Chapter-7 The p-Block Elements Assignments 10

    Explain why the stability of oxoacids of chlorine increases in the order given
    below:
    HClO < HClO2 < HClO3 < HClO4

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  • Chapter-7 The p-Block Elements Assignments 11

    On reaction with Cl2, phosphorus forms two types of halides ‘A’ and ‘B’. Halide
    A is yellowish-white powder but halide ‘B’ is colourless oily liquid. Identify A
    and B and write the formulas of their hydrolysis products.

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  • Chapter-7 The p-Block Elements Assignments 12

    Out of H2O and H2S, which one has higher bond angle and why?

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  • Chapter-7 The p-Block Elements Assignments 13

    Give reason to explain why ClF3 exists but FCl3 does not exist.

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  • Chapter-7 The p-Block Elements Assignments 14

    Why is nitric oxide paramagnetic in gaseous state but the solid obtained on
    cooling it is diamagnetic?

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  • Chapter-7 The p-Block Elements Assignments 15

    Write the structure of pyrophosphoric acid.

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  • Chapter-7 The p-Block Elements Assignments 16

    Ammonia has higher boiling point than phosphine. Why?

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  • Chapter-7 The p-Block Elements Assignments 17

    Why does PCl3 fume in moisture ?

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  • Chapter-7 The p-Block Elements Assignments 18

    What Happens when H3PO3 is Heated ?

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  • Chapter-7 The p-Block Elements Assignments 19

    Why H2S is acidic and H2S is neutral ?

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  • Chapter-7 The p-Block Elements Assignments 20

    Name two poisonous gases which can be prepared from chlorine gas ?

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  • Chapter-7 The p-Block Elements Assignments 21

    Name the halogen which does not exhibit positive oxidation state .

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  • Chapter-7 The p-Block Elements Assignments 22

    Iodine forms I3-   but F2 does not form F3-   ions .why?

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  • Chapter-7 The p-Block Elements Assignments 23

    Phosphorous forms PCl5 but nitrogen cannot form NCl5. Why?

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  • Chapter-7 The p-Block Elements Assignments 24

    Why is HF acid stored in wax coated glass bottles?

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  • Chapter-7 The p-Block Elements Assignments 25

    What is laughing gas? Why is it so called?How is it prepared?

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  • Chapter-7 The p-Block Elements Assignments 26

    Give reasons for the following:

     

    (i) Conc.HNO3 turns yellow on exposure to sunlight.

    (ii) PCl5 behaves as an ionic species in solid state.

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  • Chapter-7 The p-Block Elements Assignments 27

    What happens when white P is heated with conc.NaOH solution in an atmosphere of CO2? Give equation.

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  • Chapter-7 The p-Block Elements Assignments 28

    How is ozone estimated quantitatively?

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  • Chapter-7 The p-Block Elements Assignments 29

    Are all the five bonds in PCl5 molecule equivalent? Justify your answer.

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  • Chapter-7 The p-Block Elements Assignments 30

    NO2 is coloured and readily dimerises.Why ?

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  • Chapter-7 The p-Block Elements Assignments 31

    Account for the following. (i)SF6 is less reactive than.

    (ii) 0f the noble gases only xenon chemical compounds.

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  • Chapter-7 The p-Block Elements Assignments 32

    With what neutral molecule is ClO‐Isoelectronic? Is that molecule a Lewis base?

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  • Chapter-7 The p-Block Elements Assignments 33

    (i) why is He used in diving apparatus?

     

    (ii)Noble gases have very low boiling points.Why? (iii)Why is ICl moe reactive than I2?

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  • Chapter-7 The p-Block Elements Assignments 34

    How is XeOF4 prepared ?Draw its structure.

     

    (ii)When HCL reacts with finely powdered iron, it forms ferrous chloride and not ferric chloride .Why?

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  • Chapter-7 The p-Block Elements Assignments 35

    Account for the following.

     

    (i)Noble gas form compounds with F2&O2 only. (ii)Sulphur shows paramagnetic behavior. (iii)HF is much less volatile than HCl.

    (iv)White phosphorous is kept under water. (v)Ammonia is a stronger base than phosphine. 

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  • Chapter-7 The p-Block Elements Assignments 36

    When Conc. H2SO4 was added to an unknown salt present in a test tube, a brown gas (A) was evolved. This gas intensified when copper turnings were added in to test tube. On cooling gas (A) changed in to a colourless gas (B).

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  • Chapter-7 The p-Block Elements Assignments 37

    List the uses of Neon and argon gases.

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  • Chapter-7 The p-Block Elements Assignments 38

    Why do noble gases have comparatively large atomic sizes?

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  • Chapter-7 The p-Block Elements Assignments 39

    Give the formula and describe the structure of a noble gas species which is isostructural with:

     

    (i) 

    (ii) 

    (iii) 

     

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  • Chapter-7 The p-Block Elements Assignments 40

    Which one of the following does not exist?

    (i) XeOF4 (ii) NeF2

    (iii) XeF2 (iv) XeF6

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  • Chapter-7 The p-Block Elements Assignments 41

    Arrange the following in the order of property indicated for each set:

    (i) F2, Cl2, Br2, I2- increasing bond dissociation enthalpy.

    (ii) HF, HCl, HBr, HI - increasing acid strength.

    (iii) NH3, PH3, AsH3, SbH3, BiH3- increasing base strength.

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  • Chapter-7 The p-Block Elements Assignments 42

    How are XeO3and XeOF4prepared?

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  • Chapter-7 The p-Block Elements Assignments 43

    With what neutral molecule is ClO-isoelectronic? Is that molecule a Lewis base?

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  • Chapter-7 The p-Block Elements Assignments 44

    How are xenon fluorides XeF2, XeF4and XeF6obtained?

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  • Chapter-7 The p-Block Elements Assignments 45

    Write balanced equations for the following:

    (i) NaCl is heated with sulphuric acid in the presence of MnO2.

    (ii) Chlorine gas is passed into a solution of NaI in water

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  • Chapter-7 The p-Block Elements Assignments 46

    What are the oxidation states of phosphorus in the following:

    (i) H3PO3 (ii) PCl3 (iii) Ca3P2

    (iv) Na3PO4 (v) POF3?

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  • Chapter-7 The p-Block Elements Assignments 47

    What inspired N. Bartlett for carrying out reaction between Xe and PtF6?

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  • Chapter-7 The p-Block Elements Assignments 48

    How can you prepare Cl2from HCl and HCl from Cl2? Write reactions only.

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  • Chapter-7 The p-Block Elements Assignments 49

    Write the reactions of F2and Cl2with water.

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  • Chapter-7 The p-Block Elements Assignments 50

    Why are halogens coloured?

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  • Chapter-7 The p-Block Elements Assignments 51

    Write two uses of ClO2.

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  • Chapter-7 The p-Block Elements Assignments 52

    Explain why inspite of nearly the same electronegativity, oxygen forms hydrogen bonding while chlorine does not.

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  • Chapter-7 The p-Block Elements Assignments 53

    Explain why fluorine forms only one oxoacid, HOF.

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  • Chapter-7 The p-Block Elements Assignments 54

    Why are halogens strong oxidising agents?

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  • Chapter-7 The p-Block Elements Assignments 55

    How is SO2an air pollutant?

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  • Chapter-7 The p-Block Elements Assignments 56

    Describe the manufacture of H2SO4by contact process?

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  • Chapter-7 The p-Block Elements Assignments 57

    Which aerosols deplete ozone?

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  • Chapter-7 The p-Block Elements Assignments 58

    Knowing the electron gain enthalpy values for O → O-and O → O2-as -141

    and 702 kJ mol-1respectively, how can you account for the formation of a

    large number of oxides having O2-species and not O-?

    (Hint: Consider lattice energy factor in the formation of compounds).

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  • Chapter-7 The p-Block Elements Assignments 59

    Why is dioxygen a gas but sulphur a solid?

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  • Chapter-7 The p-Block Elements Assignments 60

    Justify the placement of O, S, Se, Te and Po in the same group of the periodic table in terms of electronic configuration, oxidation state and hydride formation.

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  • Chapter-7 The p-Block Elements Assignments 61

    Can PCl5act as an oxidising as well as a reducing agent? Justify.

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  • Chapter-7 The p-Block Elements Assignments 62

    Give the disproportionation reaction of H3PO3.

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  • Chapter-7 The p-Block Elements Assignments 63

    Why does nitrogen show catenation properties less than phosphorus?

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  • Chapter-7 The p-Block Elements Assignments 64

    Write main differences between the properties of white phosphorus and red phosphorus.

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  • Chapter-7 The p-Block Elements Assignments 65

    Nitrogen exists as diatomic molecule and phosphorus as P4. Why?

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  • Chapter-7 The p-Block Elements Assignments 66

    Explain why NH3is basic while BiH3is only feebly basic.

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  • Chapter-7 The p-Block Elements Assignments 67

    Why does R3P=O exist but R3N=O does not (R = alkyl group)?

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  • Chapter-7 The p-Block Elements Assignments 68

    The HNH angle value is higher than HPH, HAsH and HSbH angles. Why? [Hint: Can be explained on the basis of sp3hybridisation in NH3and only s-p bonding between hydrogen and other elements of the group].

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  • Chapter-7 The p-Block Elements Assignments 69

    Give the resonating structures of NO2 and N2O5.

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  • Chapter-7 The p-Block Elements Assignments 70

    Illustrate how copper metal can give different products on reaction with HNO3.

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  • Chapter-7 The p-Block Elements Assignments 71

    How is ammonia manufactured industrially?

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  • Chapter-7 The p-Block Elements Assignments 72

    How is nitrogen prepared in the laboratory? Write the chemical equations of the reactions involved.

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  • Chapter-7 The p-Block Elements Assignments 73

    Why does NH3form hydrogen bond but PH3does not?

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  • Chapter-7 The p-Block Elements Assignments 74

    Discuss the trends in chemical reactivity of group 15 elements.

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  • Chapter-7 The p-Block Elements Assignments 75

    Why does the reactivity of nitrogen differ from phosphorus?

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  • Chapter-7 The p-Block Elements Assignments 76

    Discuss the general characteristics of Group 15 elements with reference to their electronic configuration, oxidation state, atomic size, ionisation enthalpy and electronegativity.

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  • Chapter-7 The p-Block Elements Assignments 77

    Why has it been difficult to study the chemistry of radon?

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  • Chapter-7 The p-Block Elements Assignments 78

    Balance the following equation: XeF6+ H2O → XeO2F2+ HF

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  • Chapter-7 The p-Block Elements Assignments 79

    Why is helium used in diving apparatus?

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  • Chapter-7 The p-Block Elements Assignments 80

    Why is ICl more reactive than I2?

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  • Chapter-7 The p-Block Elements Assignments 81

    Name two poisonous gases which can be prepared from chlorine gas.

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  • Chapter-7 The p-Block Elements Assignments 82

    Give the reason for bleaching action of Cl2.

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  • Chapter-7 The p-Block Elements Assignments 83

    Sea is the greatest source of some halogens. Comment.

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  • Chapter-7 The p-Block Elements Assignments 84

    Give two examples to show the anomalous behaviour of fluorine.

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  • Chapter-7 The p-Block Elements Assignments 85

    Considering the parameters such as bond dissociation enthalpy, electron gain enthalpy and hydration enthalpy, compare the oxidising power of F2and Cl2.

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  • Chapter-7 The p-Block Elements Assignments 86

                                                                                                                                                                                                                                                                Why is  for H2SO4in water?

     

                                                    

     

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  • Chapter-7 The p-Block Elements Assignments 87

    Write the conditions to maximize the yield of H2SO4by Contact process.

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  • Chapter-7 The p-Block Elements Assignments 88

    Mention three areas in which H2SO4plays an important role.

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  • Chapter-7 The p-Block Elements Assignments 89

    How is the presence of SO2detected?

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  • Chapter-7 The p-Block Elements Assignments 90

    Comment on the nature of two S-O bonds formed in SO2molecule. Are the two S-O bonds in this molecule equal?

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  • Chapter-7 The p-Block Elements Assignments 91

    What happens when sulphur dioxide is passed through an aqueous solution of Fe(III) salt?

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  • Chapter-7 The p-Block Elements Assignments 92

    How is O3estimated quantitatively?

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  • Chapter-7 The p-Block Elements Assignments 93

    Why does O3act as a powerful oxidising agent?

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  • Chapter-7 The p-Block Elements Assignments 94

    Complete the following reactions:

    (i) C2H4 + O2 →

    (ii) 4Al + 3O2 →

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  • Chapter-7 The p-Block Elements Assignments 95

    Which of the following does not react with oxygen directly?

    Zn, Ti, Pt, Fe

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  • Chapter-7 The p-Block Elements Assignments 96

    Why is H2O a liquid and H2S a gas?

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  • Chapter-7 The p-Block Elements Assignments 97

    Write the order of thermal stability of the hydrides of Group 16 elements.

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  • Chapter-7 The p-Block Elements Assignments 98

    List the important sources of sulphur.

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  • Chapter-7 The p-Block Elements Assignments 99

    What happens when H3PO3is heated?

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  • Chapter-7 The p-Block Elements Assignments 100

    What is the basicity of H3PO4?

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  • Chapter-7 The p-Block Elements Assignments 101

    Write a balanced equation for the hydrolytic reaction of PCl5in heavy water.

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  • Chapter-7 The p-Block Elements Assignments 102

    What happens when PCl5is heated?

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  • Chapter-7 The p-Block Elements Assignments 103

    What happens when white phosphorus is heated with concentrated NaOHsolution in an inert atmosphere of CO2?

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  • Chapter-7 The p-Block Elements Assignments 104

    Bond angle in is higher than that in PH3. Why?

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  • Chapter-7 The p-Block Elements Assignments 105

    What is the covalence of nitrogen in N2O5?

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  • Chapter-7 The p-Block Elements Assignments 106

    How does ammonia react with a solution of Cu2+?

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  • Chapter-7 The p-Block Elements Assignments 107

    Mention the conditions required to maximise the yield of ammonia.

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  • Chapter-7 The p-Block Elements Assignments 108

    Why is N2less reactive at room temperature?

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  • Chapter-7 The p-Block Elements Assignments 109

    Why is BiH3the strongest reducing agent amongst all the hydrides of

    Group 15 elements?

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  • Chapter-7 The p-Block Elements Assignments 110

    Why are pentahalides more covalent than trihalides?

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