S-Blocks Elements - Chapter No 11

Right Answers have been shown below in red color.

1. In the Solvay process good yield of sodium bicarbonate is obtained at the temperature of.

a) 15ºC
b) 20ºC
c) 25ºC
d) None of the above

2. Sodium is prepared by electrolysis of?

a) NaOH
b) Na2CO3
c) NaCL
d) None of the above

3. In the alkali metal series which of the following is most reactive?

a) Li
b) Na
c) K
d) None of the above

4. Caustic soda is manufactured by.

a) Lechlanche cell
b) Nelson cell
c) Downs cell
d) None of the above

5. How many electrons are there in the valence orbital(s) of alkali metals?

a) Zero
b) One
c) Two
d) One or two

6. Sodium forms.

a) Super oxide
b) Peroxide
c) Normal oxide
d) None of the above

7. On the basis of atomic number alkali metal elements can be arranged in order.

a) Li, Na, K, Rb, Cs, Fr
b) Li, Na, K, Cs, Rb, Fr
c) Li, Na, K, Fr, Rb, Cs
d) Li, Na, K, Cs, Fr, Rb

8. Which of the following most abundant alkali metal combines state in nature?

a) CaSO4
b) CaSO4 .H2O
c) CaSO4. 2H2O
d) CaSO4 .3H2O

9. Baking soda is.

a) Na2CO3
b) K2CO3
c) NaH CO3
d) None of the above

10. Calcium hydro oxide is called _______.

a) Slaked lime
b) Un slaked lime
c) Lime stone
d) None of the above

11. The elements in which electrons enter the s-orbital are called _______.

a) S-block element
b) P- block element
c) F- block element
d) D- block element

12. The element of the I-A and II-A groups belong to?

a) P- block element
b) F- block element
c) D- block element
d) S-block element

13. Which of the following is the electronic configuration of sodium?

a) 1s2, 2s1 or [He] 2s1
b) 1s2, 2s2p6 3s1 or [Ne] 3s1
c) 1s2, 2s2p6, 3s2p6, 4s1 or [Ar] 4s1
d) 1s2, 2s2p6

14. The solvent used in the extraction of aluminum from its ore is _______.

a) Bauxite
b) Chromite
c) Cryolite
d) Anhydrite

15. Alkali metals are_______ conductors of heat and electricity.

a) Good
b) Bad
c) Slow
d) Fast

16. Which two of the following elements have wide application in the transistor industry?

a) Silicon and germanium
b) Tungsten and platinum
c) Iridium and platinum
d) Carbon and germanium

17. The brown gas is formed when metals reduce HNO3 is?

a) NO2
b) N2O5
c) N2O4
d) N2O3

18. In Oswald’s process which substance is used to oxidize NH3?

a) O2
b) NO2
c) P4O10
d) P4N6

19. Which of the following is paramagnetic?

a) NH2OH
b) NO2
c) N2O3
d) N2H6C12

20. Which one of the following elements does not show allotropy?

a) Sb
b) Bi
c) As
d) P

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