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Some pBlock Elements

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Q 1. Lead pencil contains

{tex} \mathrm { Pb } {/tex}

{tex} \mathrm { FeS } {/tex}

Graphite

{tex} \mathrm { PbS } {/tex}

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Q 2. A gas that cannot be collected over water is

{tex} \mathrm { N } _ { 2 } {/tex}

{tex} \mathrm O _ { 2 } {/tex}

{tex} \mathrm { SO } _ { 2 } {/tex}

{tex} \mathrm { PH } _ { 3 } {/tex}

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Q 3. Concentrated {tex}\mathrm {HNO} _ { 3 } {/tex} reacts with iodine to give

{tex} \mathrm { HI } {/tex}

{tex} \mathrm { HOI } {/tex}

{tex} \mathrm { HOIO } _ { 2 } {/tex}

{tex} \mathrm { HOIO } _ { 3 } {/tex}

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Q 4. The material used in solar cells contains

{tex} \mathrm { Cs } {/tex}

{tex} \mathrm { Si } {/tex}

{tex} \mathrm { Sn } {/tex}

{tex} \mathrm { Ti } {/tex}

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Q 5. A gas {tex} ' \mathrm { X }' {/tex} is passed through water to form a saturated solution. The aqueous solution on treatment with silver nitrate gives a white precipitate. The saturated aqueous solution also dissolves magnesium ribbon with evolution of a colourless gas {tex} '\mathrm {Y } ' {/tex}. Identify {tex} '\mathrm { X } ' {/tex} and {tex} '\mathrm { Y } ' {/tex}

{tex} \mathrm { X } = \mathrm { CO } _ { 2 } , \mathrm { Y } = \mathrm { Cl } _ { 2 } {/tex}

{tex} \mathrm { X } = \mathrm { Cl } _ { 2 } , \mathrm { Y } = \mathrm { CO } _ { 2 } {/tex}

{tex} \mathrm { X } = \mathrm { Cl } _ { 2 } , \mathrm { Y } = \mathrm { H } _ { 2 } {/tex}

{tex} \mathrm { X } = \mathrm { H } _ { 2 } , \mathrm { Y } = \mathrm { Cl } _ { 2 } {/tex}

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Q 6. Which of the following isomers of phosphorus are thermodynamically least and most stable?

White (least), Red (most)

Yellow (least), Red (most)

Red (least), White (most)

White (least), Black (most)

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Q 7. Extra pure {tex} \mathrm { N } _ { 2 } {/tex} can be obtained by heating

{tex} \mathrm { NH } _ { 3 } {/tex} with {tex} \mathrm { CuO } {/tex}

{tex} \mathrm { NH } _ { 4 } \mathrm { NO } _ { 3 } {/tex}

{tex} \left( \mathrm { NH } _ { 4 } \right) _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } {/tex}

{tex} \mathrm { Ba } \left( \mathrm { N } _ { 3 } \right) _ { 2 } {/tex}

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Q 8. The reaction of white phosphorus with aqueous {tex}\mathrm {NaOH}{/tex} gives phosphine along with another phosphorus containing compound. The reaction type, the oxidation states of phosphorus in phosphine and the other product, respectively, are

redox reaction, {tex} - 3 {/tex} and {tex} - 5 {/tex}

redox reaction, {tex} 3 {/tex} and {tex} + 5 {/tex}

disproportionation reaction, {tex} - 3 {/tex} and {tex} + 5 {/tex}

disproportionation reaction, {tex} - 3 {/tex} and {tex} + 3 {/tex}

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Q 9. The element with the highest first ionization potential is

boron

carbon

nitrogen

oxygen

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Q 10. Moderate electrical conductivity is shown by

silica

graphite

diamond

carborundum

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Q 11. Chlorine acts as a bleaching agent only in presence of

dry air

moisture

sunlight

pure oxygen

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Q 12. Bromine can be liberated from potassium bromide solution by action of

iodine solution

chlorine solution

sodium chloride

potassium iodide

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Q 13.

Which of the following is arranged in the increasing order of enthalpy of vaporization?

Most least

volatile volatile due to

H-bonding

Electrons

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Q 14.

The number of bonds in cyclic metaphosphoric acid is

Zero

Two

Three

Four

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Q 15.

Phosphorus trichloride, undergoes hydrolysis to produce an oxoacid. It has the formula

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Q 16.

Principal cause of ozone depletion is the

Presence of fluorocarbons

Acid rain

Photochemical smog

Green-house effect

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Q 17.

Following are neutral oxides except

NO

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Q 18.

Thermodynamically most stable form of carbon is

Graphite

Diamond

Ionsdaleite

Chaoite

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Q 19.

In making casting of metal, silicon is used as

Oxidizer

Semiconductor

Deoxidizer

None of these

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Q 20.

Reactivity of borazole is greater than that of benzene because

Borazole is polar compound

Borazole is non-polar compound

Borazole is electron deficient compound

Of localized electros in it

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Q 21.

Cold solution of barium nitrite on mixing with sulphuric acid produces

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Q 22.

Borax is used

As a flux in brazing and in silver soldering

In making enamel

In leather tanning

In all given above

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Q 23.

Which is the incorrect statement about silicones?

They are repeating units in silicates

They are synthetic polymers containing repeated units

They are formed by hydrolysis of

All the above are incorrect statements

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Q 24.

can be used as

Reducing agent

Oxidizing agent

Catalyst in Friedel Crafts reaction

A base

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Q 25.

In aqueous solution disproportionates to

and

by by

reduction oxidation

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