p - Block Elements - II Important Questions

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
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. Which is true regarding nitrogen?

(a)

least electronegative element

(b)

has low ionisation enthalpy than oxygen

(c)

d- orbitals available

(d)

ability to form pπ-pπ bonds with itself

3. An element belongs to group 15 and 3 rd period of the periodic table, its electronic configuration would be

(a)

1s2 2s2 2p4

(b)

1s2 2s2 2p3

(c)

1s2 2s2 2p6 3s2 3p2

(d)

1s2 2s2 2p6 3s2 3p3

4. S-S bond is present in

(a)

H2S2O7.

(b)

H2SO5

(c)

H2S2O6

(d)

H2S2O6

5. Pick the wrong one among the following

(a)

F2 - Yellow

(b)

Br2 - Red

(c)

Cl2 - Colourless

(d)

I2- Violet

6. 5 x 1 = 5
7. AX7

8. (1)

Pentangonal bipyramidal

9. Hydrogen Chlorate

10. (2)

$\beta$ sulphur

11. Plastic sulphur

12. (3)

Pungent smelling gas

13. Monoclinic sulphur

14. (4)

$\gamma$ sulphur

15. Sulphur dioxide

16. (5)

Volcanic eruptions

5 x 2 = 10
17. What are interhalogen compounds? Give examples.

18. Give the uses of helium.

19. How is nitrogen prepared from liquid air?

20. What is phosphoresencer?

21. What is the reaction of Phosphorous with alkali?

22. 5 x 3 = 15
23. Write the molecular formula and structural formula for the following molecules.
a) Nitric acid
b) dinitrogen pentoxide
c) phosphoric acid
d) phosphine

24. Write the valence shell electronic configuration of group-15 elements.

25. Discuss the anomalous nature of fluorine.

26. Write the order of thermal stability of the hydrides of group 16 elements.

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

28. 3 x 5 = 15
29. Complete the following reactions.
1. NaCl + MnO2 + H2SO4
2. NaNO2 + HCl ⟶
3. IO3-+ I- + H+ ⟶
4. I2 + S2O32- ⟶
5. P4 + NaOH + H2O ⟶
6. AgNO3 + PH3 ⟶
7. Mg + HNO3 ⟶
8. KCIO3 $\overset { a }{ \longrightarrow }$
9. $\quad Cu+\overset { Hotconc }{ { H }_{ 2 }SO_{ 4 } }$ ⟶
10. Sb + Cl2 ⟶
11. HBr + H2SO4 ⟶
12. XeF6 + H2O ⟶
13. XeO64- + Mn2+ + H+ ⟶
14. XeOF4 + SiO2 ⟶
15. $Xe+{ F }_{ 2 }\overset { Ni/200atm }{ \underset { 400^{ 0 }C }{ \longrightarrow } }$.

30. Give a detailed account on allotropes of sulphur.

31. Howdoes sulphuric acid react with metals at various conditions