Question # 1

All acids turn blue litmus.

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Red

Blue

Pinck

White

Incomplete combustion of alkanes produces.

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Carbon dioxide only

Carbon monoxide only

Carbon monoxide and carbon black

Carbon dioxide and carbon black

Permanent hardness can be removed by using .

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Soda lime

Sodium Zeolite

Quick lime

Lime water

Petroleum fraction having composition C₇to C₁₀IS called

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Petroleum gas

Petroleum Ether

Kerosine oil

Gasoline or petrol

What is the colour of hydrogen iodide in product?

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Purple

Yellow

Blue

Colorless

The impurities associated with the minerals are known as:

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Metallurgy

Ores

Gangue

Compounds

Which one is a pentahydroxy ketone?

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sucrose

glucose

fructose

lactose

In smelting process a small amount of coke is required because:

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it is highly endothermic process

it is highly exothermic process

it is very fast process

it is very slow process

Which of the following is the hardest coal?

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Pear

Lignite

Bituminous

Anthracite

The number of carbon atoms present in kerosene oil.

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8-12

9-12

10-12

11-12

Which acid used for food preservation?

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H₂SO₄

HNO₃

HCl

CH₃COOH

Some orchids attracts bees for pollination by producing.

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alkanes

almenes

alkynes

all the above.

Normaily rain water is weakly acidic because.

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SO₃

CO₂

CO₃

NO₂

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