Question # 1

Period nuebr tells abou the

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No. of valance electrons

No. of electronic shells

Both a and b

None of the above

According to Arrhenius concept base is a substance which dissociates in aqueios solution to give

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Hydroxide ions

Hydrogen ions

Pair of Electrons

Proton

Predict themain characteristics of the reactions of metals with acids.

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Metals are dissolved

Hydrogen gas is envolved

Metals are coverted into salts

All the above mentioned characteristics are true

Aerobic respiration releases........energy than anaerobic respiration.

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Equal

Less

More

None of these

Which of the following cannot be classified as Arrhenius acid

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CO2

HNO3

H2CO3

H2SO4

Number of neurtons in ²⁷M₁₃are

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13

14

27

15

Ammonia is a base, because it

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Ionizes in water to give OH- Ions

Can accept proton

Contains OH group

Can accept an election pair

Which acid is used in he preparation of soaf.

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Oxalic Acid

Citric Acid

Stearic Acid

Tartaric Acid

The branch of chemistry that helps to treat dseases and synthesize new medicines.

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Physical Chemistry

Environmental Chemistry

Organic chemistry

Inorganic chemistry

When a chemical reaction is carried out with a substancZ; a gas is produced which turns red litmus paper blue. What is the reaction?

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Reaction of an acid with a meal carbonate

Reactin of an alkali with ammonium salt

Reaction of an acid with ammonium salt

None of these

If the Delta H value is negative then reaction witll be

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Endotermic

Exothermic

May or may not be exothermic or endothermic

None of these

A reaction between an acid and a base produces

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Salt and an acid

Sald and base

Salt and water

Salt and gas

Following are state of matter.

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Liquid

Solid

Gas

All of these

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Chemistry 9th Class English Medium Online Test MCQs With Answers

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