Question # 1

ozone depletion (i.e O3--------------> O2 + O) occurs in:

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lower stratosphere

middle stratosphere

upper stratosphere

troposphere

Which one of the following is crystalline solid.

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Glucose

Starch

Cellulose

Glycogen

The color of Fe(OH)₂ ppt is.

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White

Brown

Muddy green

Blue

Concentration of copper are is carried out by process.

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Roasting

Forth floatation

Gravity sepration

Electrostatic separation

By the increase in the concentration of CO₂ in air.

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Decrease in heat energy

Increase in heat energy.

Heat energy remains same

None of them

Petroleum fraction having composition C₇to C₁₀IS called

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Petroleum gas

Petroleum Ether

Kerosine oil

Gasoline or petrol

Night blindness is because of deficiency of:

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Vitamin A

Protein

Vitamin C

Vitamin D

The gas use by plants to perform photosynthesis.

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O₂

CO₂

N₂

CO

Salt makes the water permanently hard.

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CaSO₄

Ca(HCO₃)₂

NaHCO₃

NaCO₃

General formula of Alkyl radical is..

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C₆H_2n-2

C_nH_2n+2

C₁₁H_2n-1

C_nH_2n-2

Formula of soda ash is.

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Na₂CO₃

NaHCO₃

Na₂SO₄

Na₃PO₄

Which one of the following is not a greenhouse Effect?

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Increasing atmosphere temperature.

Increasing food chains

increasing flood risks

Increasing sea-level

The number of carbon atoms present in diesel oil.

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10-15

11-15

12-15

13-15

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