${\rm{N}}{{\rm{a}}_2}{{\rm{B}}_4}{{\rm{O}}_7}.10{{\rm{H}}_2}{\rm{O}}$

${\rm{N}}{{\rm{a}}_2}{\rm{C}}{{\rm{O}}_3}.10{{\rm{H}}_2}{\rm{O}}$

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NEET • CHEMISTRY • 13 TH GROUP ELEMENTS (P-BLOCK)

13 th group elements (p-block) practice · Easy

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Showing 1-30 of 52 questions

1 Easy

1 of 52

Understanding +4 | -1

Which one of the following does not exist in the free state

View answer and explanation

Correct option: D

B{H_3}

Option D (

B{H_3}

) is correct because Borane (

B{H_3}

) exists as a dimer (

B_2H_6

) due to its electron deficiency.

2 Easy

2 of 52

Remembering +4 | -1

Tincal is

View answer and explanation

Correct option: C

\mathrm{N}{\mathrm{a}_2}{\mathrm{B}_4}{\mathrm{O}_7}.10{\mathrm{H}_2}\mathrm{O}

Option C (

\mathrm{N}{\mathrm{a}_2}{\mathrm{B}_4}{\mathrm{O}_7}.10{\mathrm{H}_2}\mathrm{O}

) is correct because Tincal is the mineral name for hydrated sodium tetraborate, which is borax.

3 Easy

3 of 52

Analyzing +4 | -1

Incorrect statement in the following is

View answer and explanation

Correct option: D

Oxides of boron are amphoteric in nature

Option D (Oxides of boron are amphoteric in nature) is correct because boron oxides are acidic, not amphoteric.

4 Easy

4 of 52

Understanding +4 | -1

The chloride that cannot be hydrolyzed is

View answer and explanation

Correct option: B

CC{l_4}

Option B (

CC{l_4}

) is correct because carbon tetrachloride (

CC{l_4}

) does not have any d-orbitals to accept electrons from water, making it unable to be hydrolyzed.

5 Easy

5 of 52

Analyzing +4 | -1

Fluorine is more electronegative than either boron or phosphorus. What conclusion can be drawn from the fact that

\mathrm{B}{\mathrm{F}_3}

has no dipole moment but

\mathrm{P}{\mathrm{F}_3}

has?

View answer and explanation

Correct option: D

The

\mathrm{B}{\mathrm{F}_3}

molecule must be planar triangular

Option D (The

\mathrm{B}{\mathrm{F}_3}

molecule must be planar triangular) is correct because the absence of a dipole moment in

BF_3

indicates a symmetrical, planar triangular structure, while

PF_3

has a dipole moment due to its pyramidal shape.

6 Easy

6 of 52

Application +4 | -1

An element

'X'

which occurs in the first short period has an outer electronic structure

{s^2}{p^1}

. What is the formula and acid-base character of its oxides?

View answer and explanation

Correct option: C

{X_2}{\mathrm{O}_3}

, acidic

Option C (

{X_2}{\mathrm{O}_3}

, acidic) is correct because the element X is Boron (B), and its oxide,

B_2O_3

, is acidic.

7 Easy

7 of 52

Analyzing +4 | -1

Which of the following is not a protonic and?

View answer and explanation

Correct option: A

\mathrm{B}(\mathrm{OH})_3

Option A (

\mathrm{B}(\mathrm{OH})_3

) is correct because boric acid,

\mathrm{B}(\mathrm{OH})_3

, acts as a Lewis acid by accepting a hydroxide ion, not by donating a proton, thus it is not a protonic acid.

8 Easy

8 of 52

Remembering +4 | -1

Which of the following is called inorganic benzene

View answer and explanation

Correct option: A

Borazine

Option A (Borazine) is correct because borazine (

B_3N_3H_6

) has a structure similar to benzene and is thus called inorganic benzene.

9 Easy

9 of 52

Analyzing +4 | -1

Which species does not exist?

View answer and explanation

Correct option: A

{\left[ {\mathrm{B}{\mathrm{F}_6}} \right]^{3 - }}

Option A (

{\left[ {\mathrm{B}{\mathrm{F}_6}} \right]^{3 - }}

) is correct because boron, due to its small size and lack of d-orbitals, cannot expand its coordination number to six.

10 Easy

10 of 52

Remembering +4 | -1

Colemanite is a mineral of:

View answer and explanation

Correct option: B

Option B (B) is correct because Colemanite is a hydrated calcium borate mineral, hence a mineral of Boron.

11 Easy

11 of 52

Understanding +4 | -1

Diborane readily reacts with water forming –

View answer and explanation

Correct option: C

Boric acid and

{H_2}

Option C (Boric acid and

{H_2}

) is correct because diborane reacts with water to form boric acid and hydrogen gas.

12 Easy

12 of 52

Remembering +4 | -1

Hardest element of III A group of gp.13 is:

View answer and explanation

Correct option: A

Option A (B) is correct because Boron is a non-metal and exists as a giant covalent structure, making it the hardest element in Group 13.

13 Easy

13 of 52

Understanding +4 | -1

Aluminium becomes passive in nitric acid because it:

View answer and explanation

Correct option: B

Forms a thin film of oxide

Option B (Forms a thin film of oxide) is correct because aluminum forms a passive layer of aluminum oxide (

Al_2O_3

) on its surface when exposed to nitric acid, protecting it from further reaction.

14 Easy

14 of 52

Remembering +4 | -1

In diborane, the banana bond is formed between

View answer and explanation

Correct option: A

2 electrons, 3 atoms

Option A (2 electrons, 3 atoms) is correct because in diborane, the banana bond involves 2 electrons shared between 3 atoms (B-H-B).

15 Easy

15 of 52

Understanding +4 | -1

Boron compound behave as Lewis acids because of their

View answer and explanation

Correct option: C

Electron deficient nature

Option C (Electron deficient nature) is correct because boron compounds act as Lewis acids due to their electron-deficient nature, having an incomplete octet.

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16 Easy

16 of 52

Remembering +4 | -1

Which is used as antiseptic for eyes

View answer and explanation

Correct option: A

aq.{H_3}B{O_3}

Option A (

aq.{H_3}B{O_3}

) is correct because boric acid in aqueous solution is commonly used as a mild antiseptic, especially for eyes.

17 Easy

17 of 52

Remembering +4 | -1

Aluminium appears like gold when it is mixed with:

View answer and explanation

Correct option: A

90% Cu

Option A is correct because a mixture of 90% Copper and 10% Aluminum creates an alloy that resembles gold in appearance.

18 Easy

18 of 52

Understanding +4 | -1

Due to inert pair effect in 13th group

View answer and explanation

Correct option: B

Tl shows +1 oxidation state

Option B (Tl shows +1 oxidation state) is correct because thallium (Tl) exhibits a stable +1 oxidation state due to the inert pair effect.

19 Easy

19 of 52

Analyzing +4 | -1

Assertion: Boron is a good conductor of electricity.

Reason: Boron has a low ionization energy and a high electron affinity.

View answer and explanation

Correct option: D

Assertion is false, but Reason is true

Option D is correct because Boron is a semiconductor, not a good conductor, and the reason provided is true concerning ionization energy and electron affinity.

20 Easy

20 of 52

Understanding +4 | -1

The ratio of

\mathrm{F}{\mathrm{e}_2}{\mathrm{O}_3}

and Al, in thermite is

View answer and explanation

Correct option: C

3:1

Option C (3:1) is correct because the thermite reaction involves a mixture of iron(III) oxide (

Fe_2O_3

) and aluminum (Al) in a 3:1 ratio by mass.

21 Easy

21 of 52

Remembering +4 | -1

Which of the following is most abundant in the earth crust?

View answer and explanation

Correct option: D

Option D (Al) is correct because Aluminum is the most abundant metal and the third most abundant element in the Earth's crust.

22 Easy

22 of 52

Remembering +4 | -1

Alums are used for

View answer and explanation

Correct option: D

All of these

Option D is correct because Alums are used in tanning leather, coagulating blood, and purifying water due to their ability to precipitate impurities.

23 Easy

23 of 52

Application +4 | -1

A non-metallic element of group 13 , used in making bullet proof vests is extremely hard solid of black colour. It can exist in many allotropic forms and has unusually high melting point. Its trifluoride acts as

View answer and explanation

Correct option: B

Lewis acid

Option B (Lewis acid) is correct because boron trifluoride (

BF_3

) is electron deficient and can accept a pair of electrons.

24 Easy

24 of 52

Analyzing +4 | -1

Which one of the following compounds, is not a protonic acid?

View answer and explanation

Correct option: C

\mathrm{B}{\left( {\mathrm{OH}} \right)_3}

The correct answer is C (B(OH)3) because it acts as a Lewis acid by accepting OH- ions from water, rather than donating protons (H+).

25 Easy

25 of 52

Remembering +4 | -1

Which of the following is non-metallic?

View answer and explanation

Correct option: A

Option A is correct because Boron (B) is a metalloid, exhibiting properties intermediate between metals and nonmetals, and is generally considered non-metallic.

26 Easy

26 of 52

Application +4 | -1

Oxidation state of boron in magnesium boride

\left( {M{g_3}{B_2}} \right)

View answer and explanation

Correct option: A

- 3

Option A (

-3

) is correct because magnesium is +2 and the overall compound is neutral, leading to a -3 oxidation state for boron.

27 Easy

27 of 52

Remembering +4 | -1

Borazole is obtained by reacting

{B_2}{H_6}

with

View answer and explanation

Correct option: A

N{H_3}

in the ratio

1:2

Option A (

N{H_3}

in the ratio

1:2

) is correct because borazole is formed by the reaction of diborane (

{B_2}{H_6}

) with ammonia (

N{H_3}

) in a 1:2 ratio.

28 Easy

28 of 52

Analyzing +4 | -1

Assertion: The solubility of aluminum hydroxide in water decreases at higher temperatures.

Reason: This is due to the decrease in the solubility product of aluminum hydroxide at higher temperatures.

View answer and explanation

Correct option: C

Assertion is true, but Reason is false

The correct answer is C (Assertion is true, but Reason is false) because the solubility of aluminum hydroxide decreases at higher temperatures, but this is due to its endothermic dissolution, not a decrease in the solubility product.

29 Easy

29 of 52

Remembering +4 | -1

The liquid field metal expanding on solidification is

View answer and explanation

Correct option: B

\mathrm{Ga}

Option B is correct because Gallium (Ga) is known to expand upon solidification, a property it shares with water and bismuth.

30 Easy

30 of 52

Remembering +4 | -1

Borax glass of a mixture of

View answer and explanation

Correct option: A

NaB{O_2} + {B_2}{O_3}\,

Option A (

NaB{O_2} + {B_2}{O_3}\,

) is the correct composition of borax glass, which is formed upon heating borax.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 52 single-correct-answer MCQs on 13 TH GROUP ELEMENTS (P-BLOCK).
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