Some S Block Elements - Inorganic Chemistry - Chemistry Previous Year Questions

1

2017 · Chemistry · Inorganic Chemistry · Some S Block Elements

WB JEE 2017

Which of the following solutions will turn violet when a drop of lime juice is added to it?

A

A solution of NaI

B

A solution mixture of KI and NaIO₃

C

A solution mixture of NaI and KI

D

A solution mixture of KIO₃ and NaIO₃

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2

2017 · Chemistry · Inorganic Chemistry · Some S Block Elements

WB JEE 2017

During electrolysis of molten NaCl, some water was added. What will happen?

A

Electrolysis will stop

B

Hydrogen will be evolved

C

Some amount of caustic soda will be formed

D

A fire is likely

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3

2018 · Chemistry · Inorganic Chemistry · Some S Block Elements

WB JEE 2018

Which of the following is least thermally stable?

A

MgCO₃

B

CaCO₃

C

SrCO₃

D

BeCO₃

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4

2019 · Chemistry · Inorganic Chemistry · Some S Block Elements

WB JEE 2019

The compound, which evolves carbon dioxide on treatment with aqueous solution of sodium bicarbonate at 25\(^\circ\)C, is

A

C₆H₅OH

B

CH₃COCl

C

CH₃CONH₂

D

CH₃COOC₂H₅

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5

2019 · Chemistry · Inorganic Chemistry · Some S Block Elements

WB JEE 2019

The reactive species in chlorine bleach is

A

Cl₂O

B

OCl^\(-\)

C

ClO₂

D

HCl

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6

2020 · Chemistry · Inorganic Chemistry · Some S Block Elements

WB JEE 2020

In the extraction of Ca by electro reduction of molten CaCl₂ some CaF₂ is added to the electrolyte for the following reason :

A

To keep the electrolyte in liquid state at temperature lower than the m.p. of CaCl₂

B

To effect precipitation of Ca

C

To effect the electrolysis at lower voltage

D

To increase the current efficiency

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7

2021 · Chemistry · Inorganic Chemistry · Some S Block Elements

WB JEE 2021

The white precipitate (Y), obtained on passing colorless and odourless gas (X) through an ammoniacal solution of NaCl, losses about 37% of its weight on heating and a white residue (Z) of basic nature is left. Identify (X), (Y) and (Z) from following sets.

A

(X)	(Y)	(Z)
\({N_2}\)	\({(N{H_4})_2}C{O_3}\)	\(N{H_4}Cl\)

B

(X)	(Y)	(Z)
\({O_2}\)	\(NaN{H_4}C{O_3}\)	\(NaHC{O_3}\)

C

(X)	(Y)	(Z)
\(C{O_2}\)	\(N{H_4}HC{O_3}\)	\({(N{H_4})_2}C{O_3}\)

D

(X)	(Y)	(Z)
\(C{O_2}\)	\(NaHC{O_3}\)	\(N{a_2}C{O_3}\)

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8

2021 · Chemistry · Inorganic Chemistry · Some S Block Elements

WB JEE 2021

Indicate the products (X) and (Y) in the following reactions

Na₂S + nS(n = 1 \(-\) 8) \(\to\) (X)

Na₂SO₃ + S \(\to\) (Y)

A

(X)	(Y)
\(N{a_2}{S_2}{O_3}\)	\(N{a_2}{S_2}\)

B

(X)	(Y)
\(N{a_2}{S_{(n + 1)}}\)	\(N{a_2}{S_2}{O_3}\)

C

(X)	(Y)
\(N{a_2}{S_n}\)	\(N{a_2}{S_2}{O_3}\)

D

(X)	(Y)
\(N{a_2}{S_5}\)	\(N{a_2}{S_2}{O_4}\)

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9

2022 · Chemistry · Inorganic Chemistry · Some S Block Elements

WB JEE 2022

To a solution of colourless sodium salt, a solution of lead nitrate was added to have a white precipitate which dissolves in warm water and reprecipitates on cooling. Which of the following acid radical is present in the salt?

A

Cl^\(-\)

B

SO\(_4^{2 - }\)

C

S^2\(-\)

D

NO\(_3^{ - }\)

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10

2022 · Chemistry · Inorganic Chemistry · Some S Block Elements

WB JEE 2022

A sample of MgCO₃ is dissolved in dil. HCl and the solution is neutralized with ammonia and buffered with NH₄Cl / NH₄OH. Disodium hydrogen phosphate reagent is added to the resulting solution. A white precipitate is formed. What is the formula of the precipitate?

A

Mg₃(PO₄)₂

B

Mg(NH₄)PO₄

C

MgHPO₄

D

Mg₂P₂O₇

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11

2022 · Chemistry · Inorganic Chemistry · Some S Block Elements

WB JEE 2022

The correct statement(s) about B₂H₆ is /are :

A

All B atoms are sp³ hybridised.

B

It is paramagnetic.

C

It contains 3C - 4C bonding.

D

There are two types of H present.

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12

2023 · Chemistry · Inorganic Chemistry · Some S Block Elements

WB JEE 2023

Na\(_2\)CO\(_3\) is prepared by Solvay process but K\(_2\)CO\(_3\) cannot be prepared by the same because

A

K\(_2\)CO\(_3\) is highly soluble in H\(_2\)O

B

KHCO\(_3\) is sparingly soluble

C

KHCO\(_3\) is appreciably soluble

D

KHCO\(_3\) decomposes

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