Question # 1

Alkanes do not react in

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Diffused sunlight

Dark

Bright sunlight

None of these

Water become hard because of:

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Ca+2

Mg+2

SO-24

all of these

Which gas is also known as life gas for plants.

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CO

CO₂

O₂

NO₂

Which element do not causes toxicity in water?

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Lead

Arsenic

Sodium

Mercury

Concentration is a separating technique in which mineral is separated from.

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Gangue

Silicates

Aluminates

All

Acidic solutions have pH value.

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Less than 7

Greater than 7

equal to 7

None of these

K_c is always equal to

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Rf/Rr

Kf /Kt

Kf/Kr

Rr/Rt

Oxidation of Ethene with KMnO₄ produces.

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Oxalic acid

Glyoxal

Ethene Glycol

Propene glycol

Water which produces good lather with soap is called.

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Soft water

Hard water

Heavy water

All of them

Which one of the following statements is not correct about active mass?

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Rate of reaction is directly proportional to activ emass.

Active mass is taken in molar concentration

Active mass is represented by square brackets

Active mass means total mass of substances.

Water is a;

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strong electrolyte

non-electrolyte

weak electrolyte

natural compound

Which process is responsible for ascending of water in roots:

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evaporation

transpiration

condensation

capillary action

Dynamic means, reaction is:

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In forward direction

Stop

In reverse direction

Still continuing.

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