The p-Block Elements Test

Result

The p-Block Elements Test - 71

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following element does not show inert pair effect?

A
$$Tl$$

B
$$Pb$$

C
$$Bi$$

D
$$Al$$
Question 2
1 / -0

In which of the following element +1 oxidation state is more stable ?

A
$$B$$

B
$$Al$$

C
$$Ga$$

D
$$Tl$$

Solution
Question 3
1 / -0

Carbon black is obtained when methane is :

A
heated in absense of air

B
heated in presence of nitrogen

C
heated in presence of ammonia

D
heated with steam

Solution
Question 4
1 / -0

Single Correct Answer Type
Consider the given sequence of reaction and identify
P and Q:
Q (Green colored)

A
$$P=Na_3,BO_3,Q=Cr(BO_2)_3$$

B
$$P=B_2O_3,Q=CrBO_3$$

C
$$P=Na_2B_4O_7,Q=Cr(BO_2)_3$$

D
$$P=B_2O_3,Q=Cr(BO_2)_3$$

Solution
Question 5
1 / -0

Aqueous solution of a salt (Y) is alkaline to litmus. On strong heating, it swells-up to give a glassy material. When conc. $$H_2SO_4$$ is added to a hot concentrated solution of (Y), white crystals of a weak acid separates out. Hence, the compound (Y) is:

A
$$Na_2SO_4.10H_2O$$

B
$$Ca_2P_6O_{11}.10H_2O$$

C
$$Na_2B_6O_{11}$$

D
$$Na_2B_4O_7.10H_2O$$

Solution

$$H_3BO_3$$ is weak acid.

Option D is correct.
Question 6
1 / -0

Among $$Al_2O_3, SiO_2, P_2O_3$$, and $$SO_2$$, the correct order of acid strength is:

A
$$Al_2O_3 < SiO_2 < SO_2 < P_2O_3$$

B
$$SiO_2 < SO_2 < Al_2O_3 < P_2O_3$$

C
$$SO_2 < P_2O_3 < SiO_2 < Al_2O_3$$

D
$$Al_2O_3 < SiO_2 < P_2O_3 < SO_2$$

Solution

Acidinc strength depends upon non-metallic character of atom. As we move left to right in a period non-metallic character increases and hence acidity increases.
So correct order is: $$ Al_2O_3 < SiO_2 < P_2O_3 < SO_2 $$
Question 7
1 / -0

Which element exhibits both $$+1$$ and $$+3$$ oxidation numbers in its compounds?

A
$$B$$

B
$$Be$$

C
$$Sn$$

D
$$Tl$$

Solution
Question 8
1 / -0

The blue coloured mineral 'Lapis Lazuli' which is used as a semi-precious stone is a mineral of the following class:

A
sodium alumino silicate

B
zinc cobaltate

C
basic copper carbonate

D
prussian blue

Solution

Lapis Lazuli, a semi-precious stone is a "Sodium Alumino Silicate" class of mineral.

Hence, Option "A" is the correct answer.
Question 9
1 / -0

The correct order of atomic radii of group $$13$$ elements is

A
$$B < Al \sim Ga > In$$

B
$$B < Al < Ga<In$$

C
$$B < Al < Ga \sim In$$

D
$$B < Ga < Al \sim In$$

Solution

Hint: There is some exception in the atomic radius of group 13 elements.
Step 1: Atomic radii of group 13 elements
$$B$$: Boron has the smallest atomic radius among group 13 elements.
$$Ga$$: In $$Ga$$, the $$d$$ orbital does not shield the nucleus effectively. So the effective nuclear charge is higher for the outermost electrons. So, the atomic radius is smaller.
$$Al$$: Down the group, the effective nuclear charge decreases as the number of shells increases, So the atomic radius of $$Al$$ is larger.
$$In$$: In $$In$$, the $$d$$ orbital does not shield the nucleus effectively. So the effective nuclear charge is higher for the outermost electrons. But down the group, the effective nuclear charge decreases as the number of shells increases. So, these two effects result in the atomic radius of $$In$$ similar to the atomic radius of $$Al$$.
Step 2: Atomic radius order
$$B<Ga<Al\mathtt{\sim}In$$

Final Step: Correct option is (D) $$B<Ga<Al\mathtt{\sim}In$$
Question 10
1 / -0

The number of $$OH$$ units directly linked to boron atoms in $$Na_2B_4O_7 \cdot 10H_2O$$ are:

A
$$2$$

B
$$3$$

C
$$4$$

D
$$10$$

Solution