${\rm{KN}}{{\rm{O}}_3}$ +Charcoal+S

${\rm{NaN}}{{\rm{O}}_3} + {\rm{KN}}{{\rm{O}}_3} + {\rm{S}}$

${\rm{NaN}}{{\rm{O}}_3} + {\rm{S}}$

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JEE • CHEMISTRY • S-BLOCK ELEMENTS

S-block elements practice · Mixed difficulty

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 151-180 of 303 questions

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151 Easy

151 of 303

Understanding +4 | -1

Which of the following metal carbonates decomposes on heating?

View answer and explanation

Correct option: A

\mathrm{MgC}{\mathrm{O}_3}

Option A (

\mathrm{MgC}{\mathrm{O}_3}

) is correct because magnesium carbonate decomposes upon heating, releasing carbon dioxide.

152 Easy

152 of 303

Remembering +4 | -1

The carbonate of which of the following cation is insoluble in water?

View answer and explanation

Correct option: D

\mathrm{Ca}^{2+}

Option D (

\mathrm{Ca}^{2+}

) is correct because carbonates of alkali metals and ammonium are soluble, while most other carbonates, including calcium carbonate, are insoluble.

153 Easy

153 of 303

Understanding +4 | -1

Salt having maximum lattice energy among the following is

View answer and explanation

Correct option: A

\mathrm{LiF}

Option A (

\mathrm{LiF}

) is correct because lattice energy is inversely proportional to the size of the ions, and LiF has the smallest ions among the given options.

154 Easy

154 of 303

Understanding +4 | -1

Magnesium has polarizing power closer to that of:

View answer and explanation

Correct option: A

Lithium

Option A (Lithium) is correct because Magnesium and Lithium exhibit a diagonal relationship due to similar charge/size ratio.

155 Medium

155 of 303

Remembering +4 | -1

Chlorine reacts with

'X'

to form bleaching powder.

'X'

View answer and explanation

Correct option: A

Dry slaked lime

Option A (Dry slaked lime) is correct because chlorine reacts with dry slaked lime [Ca(OH)₂] to produce bleaching powder [CaOCl₂].

156 Easy

156 of 303

Understanding +4 | -1

Setting of plaster of Paris is

View answer and explanation

Correct option: D

Hydration to yield another hydrate

Option D is correct because the setting of plaster of Paris involves hydration to form gypsum, another hydrate.

157 Medium

157 of 303

Remembering +4 | -1

Sodium carbonate is manufactured by Solvay process. The products those are recycled are:

View answer and explanation

Correct option: A

\mathrm{C}{\mathrm{O}_2}\mathrm{and N}{\mathrm{H}_3}

Option A (

\mathrm{C}{\mathrm{O}_2}\mathrm{and N}{\mathrm{H}_3}

) is correct because carbon dioxide and ammonia are recycled in the Solvay process.

158 Easy

158 of 303

Remembering +4 | -1

The main constituent of egg-shells is:

View answer and explanation

Correct option: A

\mathrm{CaC}{\mathrm{O}_3}

Option A (

\mathrm{CaC}{\mathrm{O}_3}

) is correct because eggshells are primarily composed of calcium carbonate.

159 Medium

159 of 303

Remembering +4 | -1

The conversion of hydroxyapatite occurs due to presence of

{F^ - }

ions in water. The correct formula of hydroxyapatite is

View answer and explanation

Correct option: A

\left[ {3C{a_3}{{\left( {P{O_4}} \right)}_2}Ca{{\left( {OH} \right)}_2}} \right]

Option A ([3Ca3(PO4)2Ca(OH)2]) is correct because the formula for hydroxyapatite is [3Ca3(PO4)2Ca(OH)2], which is a major component of tooth enamel.

160 Medium

160 of 303

Understanding +4 | -1

Which of the following is incorrect for

CaC{O_3}?

View answer and explanation

Correct option: C

When heated to 1200 K, it decomposes to evolve

{O_2}

Option C (When heated to 1200 K, it decomposes to evolve

{O_2}

) is correct because calcium carbonate decomposes to produce calcium oxide and carbon dioxide, not oxygen.

161 Medium

161 of 303

Understanding +4 | -1

Which of the following alkali metal nitrate, on heating decomposes to give

N{O_2}

gas

View answer and explanation

Correct option: C

LiN{O_3}

Option C (

LiN{O_3}

) is correct because Lithium nitrate decomposes to give

NO_2

gas upon heating, unlike other alkali metal nitrates.

162 Easy

162 of 303

Remembering +4 | -1

Chlorophyll contains:

View answer and explanation

Correct option: C

Option C (Mg) is correct because chlorophyll contains a magnesium (Mg) ion at its center, which is essential for its function in photosynthesis.

163 Medium

163 of 303

Understanding +4 | -1

Which of the following is correct regarding first ionization potential?

View answer and explanation

Correct option: A

{E}_{({H})}>{E}_{({Li})}>{E}_{({Na})}>{E}_{({K})}

Option D (Is zero) is correct because at the initial stage of the reaction, the concentration of products is negligible, making the reaction quotient close to zero.

164 Hard

164 of 303

Understanding +4 | -1

A solution of sodium thiosulphate on addition of few drops of ferric chloride gives violet colour due to the formation of

View answer and explanation

Correct option: C

\mathrm{F}{\mathrm{e}_2}{\left( {{\mathrm{S}_2}{\mathrm{O}_3}} \right)_3}

Option C (

\mathrm{F}{\mathrm{e}_2}{\left( {{\mathrm{S}_2}{\mathrm{O}_3}} \right)_3}

) is correct because ferric thiosulphate is formed when ferric chloride reacts with sodium thiosulphate, giving a violet color.

165 Easy

165 of 303

Analyzing +4 | -1

Which can undergo both oxidation and reduction?

View answer and explanation

Correct option: C

\mathrm{B}{\mathrm{a}^ + }

The correct answer is C (

\mathrm{B}{\mathrm{a}^ + }

) because it can either gain an electron to become Ba (reduction) or lose an electron to become Ba²⁺ (oxidation).

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166 Easy

166 of 303

Remembering +4 | -1

Li, Na among alkali metals show properties of:

View answer and explanation

Correct option: D

Representative elements

Option D (Representative elements) is correct because alkali metals like Li and Na belong to the s-block, which are representative elements.

167 Hard

167 of 303

Analyzing +4 | -1

Which of the following statement is not correct?

View answer and explanation

Correct option: A

{BeF}_2

forms complex ion with

{NaF}

in which

{Be}

goes with cation

Option A is correct because

{BeF}_2

forms a complex ion with

{NaF}

where

{Be}

goes with the anion, not the cation, forming

{Na}_2[{BeF}_4]

168 Medium

168 of 303

Understanding +4 | -1

The solubility in water of sulphates down the Be group is

\mathrm{Be} > Mg > Ca > Sr > Ba

. This is due to:

View answer and explanation

Correct option: C

Higher co-ordination number

Option D (All of the above) is correct because the solubility of sulphates down the Be group decreases due to a combination of factors, including higher coordination number.

169 Easy

169 of 303

Remembering +4 | -1

An alloy of

\mathrm{Na} + \mathrm{K}

is:

View answer and explanation

Correct option: C

Both (1) and (2)

Option C (Both (1) and (2)) is correct because Na-K alloy is liquid at room temperature and is used in specially designed thermometers.

170 Medium

170 of 303

Understanding +4 | -1

For carbonates of alkali metals as we move down the group what will be the correct order of covalent characters, solubility and thermal stability -

View answer and explanation

Correct option: B

Decrease, Increase, Increase

Option D (Decrease, Increase, Increase) is correct because as we move down the group for alkali metal carbonates, covalent character decreases, solubility increases, and thermal stability increases.

171 Medium

171 of 303

Remembering +4 | -1

A solid is a compound of group 1 element and it gives a bright red colour in the flame test. The solid is

View answer and explanation

Correct option: A

\mathrm{LiBr}

Option A (

\mathrm{LiBr}

) is correct because Lithium salts are known to impart a bright red color to the flame during a flame test.

172 Easy

172 of 303

Remembering +4 | -1

Which compound is used in photography?

View answer and explanation

Correct option: D

\mathrm{N}{\mathrm{a}_2}{\mathrm{S}_2}{\mathrm{O}_3}

Option D (

\mathrm{N}{\mathrm{a}_2}{\mathrm{S}_2}{\mathrm{O}_3}

) is correct because sodium thiosulphate (

\mathrm{N}{\mathrm{a}_2}{\mathrm{S}_2}{\mathrm{O}_3}

), also known as hypo, is used as a fixing agent in photography to remove unexposed silver halide crystals.

173 Easy

173 of 303

Understanding +4 | -1

Which is more basic in character?

View answer and explanation

Correct option: A

RbOH

Option A (RbOH) is correct because basic character increases down the group in alkali metal hydroxides due to decreasing ionization energy.

174 Medium

174 of 303

Remembering +4 | -1

Gun powder is:

View answer and explanation

Correct option: A

\mathrm{KN}{\mathrm{O}_3}

+Charcoal+S

Option A (

\mathrm{KN}{\mathrm{O}_3}

+Charcoal+S) is correct because gunpowder is a mixture of potassium nitrate, charcoal, and sulfur.

175 Easy

175 of 303

Remembering +4 | -1

The metal that forms nitride by reacting directly with

{N_2}

of air, is

View answer and explanation

Correct option: D

Li

Option D (

Li

) is correct because lithium is the only alkali metal that directly reacts with nitrogen to form a stable nitride.

176 Medium

176 of 303

Understanding +4 | -1

The correct order of conductivity of ions in water is

View answer and explanation

Correct option: B

C{s^ + } > R{b^ + }\; > \mathrm{ }{K^ + } > \mathrm{ }N{a^ + }

Option B (

Cs^+ > Rb^+ > K^+ > Na^+

) is correct because smaller hydrated radius leads to higher conductivity, and hydration decreases with increasing ionic size.

177 Easy

177 of 303

Analyzing +4 | -1

Which of the following statement is incorrect ?

View answer and explanation

Correct option: C

Metallic character of alkali metals, decreases down the group

Option A (2) is correct because pent-3-en-2-ol has one chiral carbon, so it has 2 optical isomers.

178 Easy

178 of 303

Remembering +4 | -1

Excess of

N{a^ + }

ions in our system causes

View answer and explanation

Correct option: A

High BP

Option A (High BP) is correct because excess sodium (

N{a^ + }

) ions in the body can lead to high blood pressure (hypertension).

179 Medium

179 of 303

Remembering +4 | -1

The highly efficient method of obtaining beryllium is:

View answer and explanation

Correct option: B

Reduction of beryllium oxide with carbon

Option A (Reduction of beryllium halide with Mg) is correct because it is a highly efficient method for obtaining beryllium.

180 Medium

180 of 303

Remembering +4 | -1

Solvay process is used to prepare

View answer and explanation

Correct option: B

{Na}_2 {CO}_3

Option B (

{Na}_2 {CO}_3

) is correct because the Solvay process is an industrial method for the production of sodium carbonate.

Revision notes and key takeaways

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