Question # 1

An electrolyte

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Forms complex ions in solution

Gives ions only when electricity is passed

Possesses ions even in solid state

Gives ions only when dissolved in water

When quantity of electricity passed is one faraday then the mass deposited at the electrode is equal to

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One gm. atomic weight

One gm. equivalent weight

Electrochemical equivalent

None of the above

Which of the following is not present in RNA?

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Uracil

Thymine

Ribose

Phosphate

Which one of the following has the lowest boiling point?

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B

Al

Ga

Ti

The credit of discovering neutron goes to

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Rutherford

Langmuir

Chadwick

Austen

Which of the following reagent cannot be used for preparing alkyl chloride from alcohol?

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HCl + anhyd. ZnCl₂

NaCl

PCl₅

SOCl₂

Which one of the following elements occurs free in nature?

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N

P

As

Sb

Which one is not a pollutant normally?

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Hydrocarbons

Carbon dioxide

Carbon monoxide

Sulphur dioxide

The pure crystalline substance on being heated gradually first forms turbid liquid at constant temperature and still at higher temperature turbidity completely disapp-ears. The behaviour is a characteristic of substance forming

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Allotropic crystal

Liquid crystals

Isomeric crystals

Isomorphous crystals

2 g of oxygen contains number of atoms equal to that in

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0.5 g of hydrogen

4 g of sulphur

7 g of nitrogen

2.3 g of sodium

Water (H_2O) is liquid while hydrogen sulphide (H₂S) is a gas because

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Water has higher molecular weight

Hydrogen sulphide is a weak acid

Sulphure has high electronegativity than oxygen

Water molecules associate through hydrogen

The substance used as a smoke screen in warfare is

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SiCl₄

PH₃

PCl₅

Acetylene

The pore size of filter paper depends upon

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Nature of the medium

Temperature of the medium

Size of particles

Mass of the particles

In Friedal-Craft's alkylation besides AlCl₃the other reactants are

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C6H6 + NH3

C6H6 + CH4

C6H6 + CH3Cl

C6H6 + CH3COCl

Inert pair effect plays an important role in case of

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F

Al

Si

Tl

Gooch crucible is used for the filtration of precipitates having

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High Solubility

High concentration

High ignition temperature

Low Temperature

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