Daily Practice Problems
Class 11 Chemistry
The p-Block Elements
daily practice problem


Which of the following is used to make semiconductor devices and transistors?

(a) Ultrapure form of germanium

(b) Ultrapure form of silicon

(c) Both (a) and (b)

(d) Neither (a) nor (b)



SiCl62- does not exist but SiF62- exists. Explain.



Assertion: Metal borides are used as protective shields and control rods in nuclear industry.

Reason: The boron-10 (10B) isotope has high ability to absorb neutrons.

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true, but R is not the correct explanation of A.

(c) A is true, but R is false.

(d) A is false, but R is true.



An allotrope of carbon C60 contains

(a) 16 hexagons and 16 pentagons

(b) 20 hexagons and 12 pentagons

(c) 12 hexagons and 20 pentagons

(d) 18 hexagons and 14 pentagons



Correct order of tendency of catenation in group 14 elements is

(a) C > Si > Ge > Sn

(b) C >> Si > Ge Sn

(c) Si > C > Sn > Ge

(d) Ge > Sn > Si > C



B forms only [BF4]- which one of the following is formed by Al?

1) [AlF4]-

2) [AlF6]3-

3) [AlF4]3-

4) [AlF6]-



The element which can be used for measuring high temperature and exists in liquid state for a wide range of temperature is

(a) B

(b) Al

(c) Ga

(d) In



Assertion: Sulphur forms many compounds in which the octet rule is obeyed.

Reason: Due to the absence of d-orbitals in sulphur, it follows the octet rule.

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true, but R is not the correct explanation of A.

(c) A is true, but R is false.

(d) A is false, but R is true.



What happens when Boron trichloride reacts with Hydrogen at high temperature?



(i) Select the member of group 13 that

(a) shows diagonal relation with silicon

(b) is commonly found in +1 oxidation state.

(ii) Select the member(s) of group 14 that

(a) forms the most acidic dioxide.

(b) is commonly found in +2 oxidation state.  



Why Anhydrous AlCl3 is more soluble in diethyl ether?



Although Al is above Hydrogen in the electrochemical series, it is stable in air and water. Why?



Identify (A) to (F) and give chemical reactions for the reactions at steps (i) to (iv).

(i) A white precipitate (B) is formed when a mineral (A) is boiled with Na2CO3 solution.

(ii) The precipitate is filtered and the filtrate contains two compounds (C) & (D). The compound (C) is removed by crystallisation and when CO2 is passed through the mother liquor left, (D) changes to (C).

(iii) The compound (C) on strong heating gives two compounds (D) and (E).

(iv) (E) on heating with cobalt oxide produces blue coloured substance (F).



What is Inorganic benzene? Why it is so called? How will you get it from diborane?



First ionisation enthalpy for the elements of group 13 follows the order

(a) B > Al > Ga > In > Tl

(b) B < Al < Ga < In < Tl

(c) B < Al > Ga < In > Tl

(d) B > Al < Ga > In < Tl



Solid CO2 is known as dry ice. Why?



Write the balanced equation for reaction of Al4C3 & CaNCN with water.



Which silicon compound is used as:

1) Thermal Insulator

2) Lubricant

3) Cation exchanger



What happens when Red lead is treated with Nitric acid?



Starting from SiCl4 prepare Na2SiO3 in three steps (give reactions only).


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