Question # 1

At which temperature o water shows mxamimum density.

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0 ^oC

100^oC

4^oC

-4^oC

The recombination of O and O₂ in mid stratosphere is an

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Exothermic reaction

Endothermic reaction

Heat absorbing process

None of these

General formula of Alkane is.

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C₁₀H_2n-2

C₆H₂₆

C₁₁H_2n-2

C_nH_2n-2

The water which produces good lather with soap is called:

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soft water

hard water

heavy water

typical water

Coal gas is mixture of

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CO and CH₄

CO . CH₄. CO₂

CO, CH₄, H₂

CO, H₂ and CO₂

The strong heating of coal in the absence of air is called.

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Carbonization

Destructive distillation

Fractional distillation

All

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

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Nitration

Fixing

Oxidation

Reduction

The % age of nitrogen and oxygen in our atmosphere is:

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80

90

95

99

Temporary hardness is due to the presence of bicarbonates of.

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Calcium

Magnsium

Both of them

None of them

Which is Pentahydroxy aldehydes of the following?

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Starch

Glucose

Fructose

Sucrose

Alkanes are also called:

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olefins

Paraffins

aliphatic compound

cyclic compounds

Which disease causes bone and tooth damage?

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Fluorosis

Hepatits

Cholera

Jaundice

Red hair contains compound of.

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Iron

copper

titanium

Molybdenum

Soda lime is a mixture of..

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CaCl, + KOH

NaOH + CaO

NaOH + CaCl₂

Ca(OH)₂ + CaO

How many percentage blister copper is pure?

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95%

75%

98%

100%

The reaction between an acid and a base produces.

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Salts and water

Salt and gas

Salt and an acid

Salt and an base

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