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

1

2016 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2016

Which of the following statement(s) is (are) correct when a mixture of NaCl and K₂Cr₂O₇ is gently warmed with conc. H₂SO₄?

A

A deep red vapour is evolved

B

The vapour when passed through NaOH solution, gives a yellow solution

C

Chlorine gas is also evolved

D

Chromyl chloride is formed

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2

2016 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2016

The acid in which O\(-\)O bonding is present is

A

H₂S₂O₃

B

H₂S₂O₆

C

H₂S₂O₈

D

H₂S₄O₆

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3

2016 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2016

Nitrogen dioxide is not produced on heating

A

KNO₃

B

Pb(NO₃)₂

C

Cu(NO₃)₂

D

AgNO₃

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4

2016 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2016

In the solid state, PCl₅ exists as

A

[PCl₄]^\(-\) and [PCl₆]⁺ ions

B

covalent PCl₅ molecules only

C

[PCl₄]⁺ and [PCl₆]^\(-\) ions

D

covalent P₂Cl₁₀ molecules only

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5

2017 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2017

When BaCl₂ is added to an aqueous salt solution, a white precipitate is obtained. The anion among CO\(_3^{2 - }\), SO\(_3^{2 - }\) and SO\(_4^{2 - }\) that was present in the solution can be

A

CO\(_3^{2 - }\) but not any of the other two

B

SO\(_3^{2 - }\) but not any of the other two

C

SO\(_4^{2 - }\) but not any of the other two

D

Any of them

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6

2018 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2018

Which of the set of oxides are arranged in the proper order of basic, amphoteric, acidic?

A

SO₂, P₂O₅, CO

B

BaO, Al₂O₃, SO₂

C

CaO, SiO₂, Al₂O₃

D

CO₂, Al₂O₃, CO

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7

2018 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2018

Cl₂O₇ is the anhydride of

A

HOCl

B

HClO₂

C

HClO₃

D

HClO₄

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8

2018 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2018

White phosphorus P₄ has the following characteristics

A

6P \(-\) P single bonds

B

4P \(-\) P single bonds

C

4 lone pair of electrons

D

P \(-\) P \(-\) P angle of 60\(^\circ\)

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9

2018 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2018

Which of the following is present in maximum amount in 'acid rain'?

A

HNO₃

B

H₂SO₄

C

HCl

D

H₂CO₃

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10

2019 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2019

Which of the following chemicals may be used to identify three unlabelled beakers containing conc. NaOH, conc. H₂SO₄ and water?

A

NH₄NO₃

B

NaCl

C

(NH₄)₂CO₃

D

HCOONa

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11

2020 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2020

Which of the following statement(s) is/are incorrect?

A

A sink of SO₂ pollutant is O₃ in the atmosphere

B

FGD is a process of removing NO₂ from atmosphere

C

NO_x in fuel gases can be removed by alkaline scrubbing

D

The catalyst used to convert CCl₄ to CF₄ by HF is SbF₅

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12

2020 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2020

SiO₂ is attacked by which one/ones of the following?

A

HF

B

Conc.HCl

C

Hot NaOH

D

Fluorine

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13

2021 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2021

Cyclo [18] carbon is an allotrope of carbon with molecular formula C₁₈. It is a ring of 18 carbon atoms, connected by single and triple bonds. The total number of triple bonds present in this cyclocarbon are

A

9

B

10

C

12

D

6

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14

2021 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2021

Reaction of silver nitrate solution with phosphorus acid produces

A

silver phosphite

B

phosphoric acid

C

metallic silver

D

silver phosphate

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15

2022 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2022

The correct order of acidity of the following hydra acids is

A

HF > HCl > HBr > HI

B

HF < HCl < HBr < HI

C

HF < HCl > HBr > HI

D

HF > HCl < HBr > HI

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16

2024 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2024

The number(s) of \(-\mathrm{OH}\) group(s) present in \(\mathrm{H}_3 \mathrm{PO}_3\) and \(\mathrm{H}_3 \mathrm{PO}_4\) is/are

A

3 and 3 respectively

B

3 and 4 respectively

C

2 and 3 respectively

D

1 and 3 respectively

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17

2024 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2024

How many \(\mathrm{P}-\mathrm{O}-\mathrm{P}\) linkages are there in \(\mathrm{P}_4 \mathrm{O}_{10}\)

A

Six

B

Four

C

Five

D

One

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18

2025 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2025

The number of terminal and bridging hydrogens in $\mathrm{B}_2 \mathrm{H}_6$ are respectively

A

4 and 2

B

2 and 4

C

2 and 2

D

4 and 4

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19

2025 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2025

The number of lone pair of electrons and the hybridization of Xenon ( Xe ) in $\mathrm{XeOF}_2$ are

A

$1, \mathrm{sp}^3$

B

$1, \mathrm{dsp}^2$

C

$3, \mathrm{dsp}^3$

D

$2, \mathrm{sp}^3 \mathrm{~d}$

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20

2026 · Chemistry · Inorganic Chemistry · Some P Block Elements

WB JEE 2026

Borazole is prepared by heating the product isolated by reacting

A

boron with dinitrogen.

B

diborane with ammonium nitrate.

C

diborane with ammonia.

D

boron with ammonia.

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