p - Block Elements - II Book Back Questions

12th Standard EM

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5
  1. In which of the following , NH3 is not used?

    (a)

    Nessler’s reagent

    (b)

    Reagent for the analysis of IV group basic radical

    (c)

    Reagent for the analysis of III group basic radical

    (d)

    Tollen’s reagent

  2. P4O6 reacts with cold water to give

    (a)

    H3PO3

    (b)

    H4P2O7

    (c)

    HPO3

    (d)

    H3PO4

  3. The molarity of given orthophosphoric acid solution is 2M. its normality is

    (a)

    6N

    (b)

    4N

    (c)

    2N

    (d)

    none of these

  4. The correct order of the thermal stability of hydrogen halide is

    (a)

    HI > HBr > HCl > HF

    (b)

    HF > HCl > HBr > HI

    (c)

    HCl > HF > HBr > HI

    (d)

    HI > HCl > HF > HBr

  5. Most easily liquefiable gas is

    (a)

    Ar

    (b)

    Ne

    (c)

    He

    (d)

    Kr

  6. 3 x 2 = 6
  7. What is inert pair effect?

  8. Why fluorine is more reactive than other halogens?

  9. What is the hybridisation of iodine in IF7? Give its structure?

  10. 3 x 3 = 9
  11. Give the balanced equation for the reaction between chlorine with cold NaOh and hot NaOH.

  12. Give a reason to support that sulphuric acid is a dehydrating agent.

  13. Give the uses of argon.

  14. 2 x 5 = 10
  15. Give two equations to illustrate the chemical behaviour of phosphine.

  16. What happens when PCl5 is heated?

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