Question # 1

Which gas protects the Earth's surface from ultraviolet radiations?

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CO₂

CO

N₂

O₃

A complete reaction is one is which.

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All the reactants convert into products.

All the reactants do not convert into products.

Half reactants convert into products.

Only 10% reactants convert into products.

When NaHCO₃is heated if forms:

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CO₂

Ca(OH)₂

CaCO₃

CaO

Carbon monoxide is harmful to use because it:

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Paralyses lungs

Damages lungs

Reduce oxygen carrying ability of hemoglobin

Make the blood coagulate

Mesosphere has a temperature range.

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17 ^oC - 58^oC

58^oC - 2^oC

2^oC - 93^oC

- 93^oC

Which gas is used to destroy harmful bacteria in water?

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Iodine

Chlorine

Flourine

Bromine

Which pollutant is responsible for changing weather?

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Air pollutant

Water pollutant

Soil pollutant

All of them

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

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CO₂ and water.

Sunlight

O₂

Chlorophyll

Acid rain damages the building it is due to reaction on.

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Calcium sulphate

Calcium nitrate

Calcium carbonate

Calcium oxilat

Olefins is a Latin word meaning:

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inert

less reactive

oil forming

most reactive

The substance formed during the chemical reaction are called.

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Products

Reactants

Radical

Element

Which acid used for food preservation?

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H₂SO₄

HNO₃

HCl

CH₃COOH

The nitrogen present in urea is used by plants to synthesize.

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Sugar

Proteins

Fats

DNA

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