Question # 1

Which of the following is the hardest coal?

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Pear

Lignite

Bituminous

Anthracite

Temporary hardness is due to the presence of bicarbonates of.

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Calcium

Magnsium

Both of them

None of them

Ethyne is oxidized by alkaline KMnO₄ then ....... hydroxyl group add to the triple bond.

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Two

Three

Four

Five

Which base is more corrosive?

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NH₄OH

NaOH

Ca(OH)₂

AL(OH)₂

Specific heat capacity of water is.

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4.2 KJg^-1 K^-1

4.2 Jg^-1K^-1

2.4 KJg^-1K^-1

2.4 Jg^-1K^-1

Formula of Decane is.

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C₁₀H₂₀

C₁₀H₂₂

C₁₀ H₄

C₁₀H₁₆

At which temperature o water shows mxamimum density.

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0 ^oC

100^oC

4^oC

-4^oC

The process by which water rises up from the roots of plants to leaves is called.

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Photosynthesis

Respiration

Surface tension

Capillary action

For a reaction between PCL₃ and Cl₂ to form PCl₅ the units of Kc are:

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Mol dm^-3

Mol^-1 dm^-3

Mol^-1dm³

Mol dm³

When the number of moles of both sides are equal in a reaction then the unit of Kc will be:

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no unit

mol-2 dm6

mol dm3

mo-2 dn

Hookworm is a parasite that infects the:

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large intestine

small intestine

stomach

liver

Methyl butanoate smells like;

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a pine apple

an apple

an orange

a lemon

Number of vitamins in vitamin B complex is.

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10

8

6

12

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