Question # 1

Ultraviolet radiations can causes.

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Hepatitis

Asthma

Skin cancer

Night blindness

Which one of the following salts makes the water permanent hard.

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NaCO₃

NaHCO₃

Ca(HCO₃)₂

CaSO₄

Wood contain the amount of carbon.

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70%

80%

60%

40%

The rate of reverse reaction in the beginning.

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Slow

moderate

Very fast

Low

The formula of ozone is.

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O₂

O₃

O

CO

When the magnitude of Kc is very large in indicates.

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Reaction never go to completion

Reaction is in equilibrium state

Reaction will complete after some time

Reaction has almost to completion

Formula of soda ash is.

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Na₂CO₃

NaHCO₃

Na₂SO₄

Na₃PO₄

Out of twenty how many amino acids can by synthesized by human body?

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Five

Ten

Seven

Twelve

When acids react with metals which gas is evolved?

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H₂

O₂

Cl₂

N₂

Which acid is used for etching glass?

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HF

HCl

HBr

HI

Phenolphthalein produces red colour in

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Acid

Base

Both a and b

None of these

Chemical formula for urea is:

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NH4CNO

NH4CH

NH2CONH2

NH4CI

Which salt cause permanent hardness in water is:

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Ca(HCO₃)₂

Mg(HCO₃)₂

CaCl₂

KCl

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