Question # 1

Which of the following transition metal ions will have definite value of magnetic moment?

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Sc³⁺

Ti³⁺

Cu⁺

Zn²⁺

Alum is not used

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As a mordant in dyeing

As an insecticide

In purification of water

In tanning of leather

The acid used in lead storage cells is

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Phosphoric acid

Nitric acid

Sulphuric acid

Hydrochloric acid

Which of the following is acidic?

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SO₃

N₂O

BeO

HgO

Ascorbic acid is chemical name of

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Vitamin D

Vitamin A

Vitamin C

Vitamin B6

Which is not a a colligative property?

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Osmotic pressure

Lowering of vapour pressure

Depression of freezing point

Elevation of boiling point

Which of the following is an example of body centred cube?

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Magnesium

Zinc

Copper

Sodium

Which of the following value ofΔHf represent that product is least stable?

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-94.0 kcal mol^-1

-231.6 kcal mol^-1

+21.4 kcal mol^-1

+64.8 kcal mol^-1

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

Hydrogen chloride molecule contains

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Covalent bond

Double bond

Co-ordinate bond

Electrovalent bond

The halide which is not hydrolysed is

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SiCl₄

SiF₄

CCl₄

PbCl₄

The molal elevation constant is the ratio of the elevation in boiling point to

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Mojarity

Molality

Mole fraction of solute

Mole fraction of solvent

Phosphorus pentoxide finds use as

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An oxidizing agent

A reducing agent

a bleaching agent

A dehydration agent.

Which one is not a pollutant normally?

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Hydrocarbons

Carbon dioxide

Carbon monoxide

Sulphur dioxide

Heating a micture of sodium benzoate and soda lime gives

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Benzene

Methane

Sodium benzoate

Calcium benzoate

Which is the most volatile compound?

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HI

HCl

HBr

HF

Red P can be obtained from white P by

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Heating it with a catalyst in an inert atmosphere

Distilling it in an inert atmosphere

Dissolving it in CS₂and crystallzing

Melting it and pouring the liquid into water

The density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepare by a chemical reaction form a compound of nitrogen due to the presence of the following in aerial nitrogen.

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Argon

CO₂

Some nitrogen molecules analogous to O2

Greater amount of nitrogen molecules derived from N¹⁵isotope.

An endothermic reaction is one in which the reacting substances

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Have more energy than the products

Have less energy than the products

Have the same energy as the products

Are at a higher temperature than the products.

Sodium metal cannot be stored under

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Benzene

Kerosene oil

Alcohol

Toluene

Dehydration of glycerol give

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Propane

Propene

Acrolein

Benzene

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