Question # 1

Which element among the following belongs to Group IV-A of the periodic table?

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Barium

Iodine

Lead

Oxygen

Which is used in navigational equipments?

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B

Be

Mg

Al

Which of the following compounds is explosive in nature?

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Phosphorus trichloride

Nitrogen trichloride

Hyponitrous acid

Nitrosyl chloride

Baking powder has which one of the following formula

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Na₂CO₃

Na₂SO₄

NaHCO₃

K₂CO₃

Borax is a common mineral of alkali metal sodium. Its formula is

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Na₂B₄O₇

Na₂,B₄O₇. 10H₂O

Na₂B₃O₆. 10H₂O

Na₂B₄O₇- 5H₂O

The alkaline earth elements have in their s-orbital

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One electron

Two electron

No electron

Three electron

Which element forms an iron with charge 3+?

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Berylium

Aluminium

Carbon

Silicon

Potassium superoxide has a use in breathing equipment in space crafts. The balanced equation for the reaction is

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Borax is hydrated:

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Penta

Deca

Hepta

Octa

Orthophosphoric acid is

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Monobasic

Dibasic

Tribasic

Tetrabasic

Down's cell is used to prepare

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Sodium carbonate

Sodium bicarbonate

Sodium metal

Sodium hydroxide

P₂O₅is heated with water to give

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Hypophosphorus acid

Phosphorus acid

Hypophosphorus acid

Orthophosphorus acid

BiCl₃on hydrolysis forms a white precipitate of

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Bismuthio acid

Bismuth oxychloride

Bismuth pentachloride

Bismuth hydroxide

Which on of the following compounds does not exist?

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NCl₅

AsF₅

SbCl₅

PF₅

The number of unpaired electrons in the p-subshell of oxygen atom

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1

2

3

4

The element caesium bears resemblance with

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Ca

Cr

Rubidium

None of the above

On alkali and alkaline earth metals down the group, there is decreasing trend in

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m.p.

b.p.

Ionization potentiall

All of these

CaC₂on hydrolysis form

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CH₄

C₂H₄

C₂H₂

C₆H₆

Corrundam is ore of:

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Li

Be

B

Al

Phosphide ion has the electronic structure similar to that of

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Nitride ion

Fluoride ion

Sodium ion

Chloride ion

Sodium is never found free in nature because of its

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Chemical reactivity

Small ionic size

Small atomic volume

None of these

Which colour is imparted by sodium

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Yellow

Violet

Red

Crimson

______ is called milk of magnesia

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NaOH

KOH

LiOH

None

Sodium should be stored in

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Air free from moisture

Air free form carbon dioxide

Under water

Under kerosene oil

Which of the following is a tetrabasic acid?

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ORthophosphoric acid

Hyposphosphorus acid

Metaphosphoric

Pyrophosphoric acid

Silicon atom is hybridized:

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sp

sp²

sp³

dsp²

Bond angle is minimum for

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H₂O

H₂S

H₂Se

H₂Te

The acid which has a peroxy linkage is

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Sulphurous acid

Pyrosulphuric acid

Dithionic acid

Caro's acid

Which of the following is not the reactions of lithium

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Sodium forms largely

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Normal oxides

Per-oxides

Superoxides

None of these

Solvay process is used in the manufacture of

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Na₂CO₃

NaHCO₃

CaCl₂

All

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