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Chemistry 9th Class English Medium Unit 7 Online Test MCQs With Answers

Question # 1

While baking which gas is responsible for raising the bread and making it soft?

Choose an answer

Oxygen

Carbon monoxide

Carbon di oxide

Nitrogen

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Question # 2

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

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Question # 3

Whcih acid is present in our stomach.

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Nitirc Acid

Hydrochloric acid

Sulphuric acid

All of the above

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Question # 4

Milk of magnesia contains Mg(OH)2 It is used as antacid It neutralizes excess stomachaacid. Which salt is formed in this reaction.

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MgCl2

MgSO4

MgCO3

MgO

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Question # 5

Which acid is not used as a food or mixed with food?

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Tartaric Acid

Formic Acid

Ascorbic acid

Citric Acid

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Question # 6

When acids react with metal with carbonates and bicarbonates which gas is produced.

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Cl2

CO2

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Question # 7

Acids means

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Bitter

Salty

Sweet

Sour

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Question # 8

Alkalis react with ammonium salts to librate.

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CO2

SO2

NH3

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Question # 9

Which one is not an Arrhenius base.

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KOH

NaOH

NH3

Ca(OH)2

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Question # 10

According to Bronsted and Lowry concept, an acid is a substance that can donate.

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Proton

Electron pair

Neutron

Electron

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Question # 11

A base is a substance which neutralizes an acid. Which of these substances is not aa base.

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Aqueious ammonia

Calcium oxide

sodium Chloride

Sodium carbonate

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Question # 12

How many hydroxide ions, calium hydroxide will release in water.

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zero

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