Question # 1

When CaCO_3,.is heated in an open flask, it decomposes to form calcium oxides and .

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O₂

CO

CO₂

CO₃

A group of gases that maintains temperature of atmosphere is.

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Carbon dioxide and water vapours

Nitrogen and carbon dioxide

Thermosphere

Troposphere

Chemical formula of Stearic acid.

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C₁₅H₃₁COOH

C₁₇H₃₅COOH

C₁₅H₃₇COOH

None of them

Which of the following gas is used in warfare?

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Methane

Ethane gas

Mustard gas

None of these

Ozone is an allotropic form of

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Carbon

Oxygen

Sulphur

Phosphorous

Dehalogenation of Tetrahalides takes place in the presence of .

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K

Mg

Na

Zn dust

Salt makes the water permanently hard.

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CaSO₄

Ca(HCO₃)₂

NaHCO₃

NaCO₃

Dextrose is a crystallized:

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sucrose

lactose

glucose

fructose

Carbohydrates are synthesized by plants through photosynthesis process which requires the following except.

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CO₂ and water.

Sunlight

O₂

Chlorophyll

About 99% of atmospheric mass lies in.

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35 km

30 km

15 km

16 km

The process by which atmospheric nitrogen is turned into nitrates in the soil is called.

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Nitration

Fixing

Oxidation

Reduction

Which one of the following is a synthetic fibre?

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Cotton

Wool

nylon

silk

Natural source of citric acid is:

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Rancid butter

Fats

Lemon

Sour milk

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