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🩺 NEET🧪 Chemistry

The S-Block Elements

10 NEET Chemistry previous year questions on The S-Block Elements — options free on every question; 1 include the answer & explanation free, the rest unlock with PYQ Pass.

Q1 FREE PREVIEW

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Lithium halides are some what covalent is nature.
Reason (R): Lithium possess high polarisation capability. In the light of the above statements, choose the most appropriate answer from the options given below:

[JEE Main 2021, 27 Jul (Shift 1)]

a

(A) is true but ( \(R )\) is false

b

Both (A) and (R) are true but (R) is NOT the correct explanation of (A)

c

(A) is false but (R) is true

d

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

✓ Correct answer: d)

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

Explanation

Due to small size of \(Li\), it has more polarizing power due to which its most of the compounds are covalent.

Q2

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Barium carbonate is insoluble in water and is highly stable.
Reason (R): The thermal stability of the carbonates increases with increasing cationic size.
Choose the most appropriate answer from the options given below:

[JEE Main 2021, 26 Aug (Shift 2)]

a

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

b

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

c

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

d

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

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Q3

Assertion (A): An aqueous solution of \(KOH\) when for volumetric analysis, its concentration should be checked before the use.

Reason (R): On aging, \(KOH\) solution absorbs atmospheric \(CO _2\).

[JEE Main 2023, 1 Feb (Shift 2)]

a

(A) is not correct but (R) is correct

b

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

c

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

d

(A) is correct but ( \(R )\) is not correct

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Q4

The magnetic behaviour of \(Li _2 O , Na _2 O _2\) and \(KO _2\), respectively, are

[JEE Main 2023, 29 Jan (Shift 1)]

a

Diamagnetic, paramagnetic and diamagnetic

b

Paramagnetic, paramagnetic and diamagnetic

c

Paramagnetic, diamagnetic and paramagnetic

d

Diamagnetic, diamagnetic and paramagnetic

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Q5

Which of the following reaction is correct?

[JEE Main 2023, 30 Jan (Shift 2)]

a

\(2 LiNO _3 \xrightarrow{\Delta} 2 LiNO _2+ O _2\)

b

\(4 LiNO _3 \xrightarrow{\Delta} 2 Li _2 O +2 N _2 O _4+ O _2\)

c

\(4 LiNO _3 \xrightarrow{\Delta} 2 Li _2 O +4 NO _2+ O _2\)

d

\(2 LiNO _3 \xrightarrow{\Delta} 2 Li +2 NO _2+ O _2\)

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Q6

Reaction of \(BeO\) with ammonia and hydrogen fluoride gives ' \(A\) ' which on thermal decomposition gives \(BeF _2\) and \(NH _4 F\). What is 'A'?

[JEE Main 2023, 24 Jan (Shift 1)]

a

\(\left( NH _4\right)_2 BeF _4\)

b

\(H _3 NBeF _3\)

c

\(\left( NH _4\right) BeF _3\)

d

\(\left( NH _4\right) Be _2 F _5\)

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Q7

On combustion of \(Li , Na\) and \(K\) in excess of air, the major oxides formed, respectively, are:

[JEE Main 2020, 4 Sep (Shift 1)]

a

\(Li _2 O , Na _2 O _2\) and \(K _2 O\)

b

\(Li _2 O , Na _2 O _2\) and \(KO _2\)

c

\(Li _2 O , Na _2 O\) and \(K _2 O _2\)

d

\(Li _2 O , Na _2 O _2\) and \(K _2 O _2\)

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Q8

Identify the incorrect statement from the following

[NEET 2022]

a

The oxidation number of \(\mathrm{K}\) in \(\mathrm{KO}_2\) is +4

b

Ionisation enthalpy of alkali metals decreases from top to bottom in the group.

c

Lithium is the strongest reducing agent among the alkali metals.

d

Alkali metals react with water to form their hydroxides.

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Q9

The correct order of conductivity of ions in water is:

[JEE Main 2021, 17 Mar (Shift 1)]

a

\(Rb ^{+}> Na ^{+}> K ^{+}> Li ^{+}\)

b

\(Cs ^{+}> Rb ^{+}> K ^{+}> Na ^{+}\)

c

\(K ^{+}> Na ^{+}> Cs ^{+}> Rb ^{+}\)

d

\(Na ^{+}> K ^{+}> Rb ^{+}> Cs ^{+}\)

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Q10

Choose the correct statement(s):
(A) Beryllium oxide is purely acidic in nature.
(B) Beryllium carbonate is kept in the atmosphere of \(CO _2\).
(C) Beryllium sulphate is readily soluble in water.
(D) Beryllium shows anomalous behavior.

Choose the correct answer from the options given below:

[JEE Main 2023, 1 Feb (Shift 1)]

a

(A), (B) and (C) only

b

(B), (C) and (D) only

c

(A) and (B) only

d

(A) only

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