Question # 1

When small amount of acid or base is added to buffer, its pH.

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Remain same

Always increases

Always decreases

slightly increases or decreases

Isotopes differ in.

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Properties which depend upon mass

Arrangement of electrons in orbitals

Chemical properties

None of these

The net heat change in a chemical reaction is same whether it is brought about in two or more different ways in one or several steps. It is knnown as

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Henry's law

Hess's law

Joule's principle

Law of combustion

Which of the following is psuedo solid

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CaF2

Glass

NaCl

All

Gas molecules show more deviation from ideal behaviour at high pressure because.

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Velocity of molecules increases

Velocity of molecules decreases

Force of attraction between molecules increases

Force of collision per unit area increases

The number of bonds in nitrogen molecule is

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One o and oneπ

One o and twoπ

Three sigma only

Two o and twoπ

Which one of the following molecules is paramagnetic.

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H2

He

N2

O2

Which pair of molecule have Debye forces in them

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Ar and Ar

Argon and water

Na+ ions and water

water and water

Those elements whose electronegativities are 1.2 and 3.2, react to form

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Ionic bond

Covalent bond

Gaseous substance

Definiting a liquid substance

Density of a gas is usually expressed in

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kg m-3

kg dm-3

g dm-3

g cm-3

Standard enthalpy change when one mole of compound is formed from their elements at standard state is.

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Heat of formation

Standard heat of formation

Heat of combustion

Standard Heat of neutralization

The born Haber cycle is the best application of law.

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Boyle's

Dalton's

Hess's

Graham's

If the number of gas molecules are doubled in a certain volume of a gas, the pressure is.

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Decreased to half

Doubled

Increased to four time

Remains unchanged

If the electron in a hydrogen atom drops from n = 6 to n =4 level, the radiation emitted is in which series of lines in the spectrum of atomic hydrogen.

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Lyman

Balmer

Paschen

Brackett

How many moles of AgCI are produced by combination of 1.0 mole of AgNO₃and 2.0 mole of NaCI

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1.0

2.0

3.0

4.0

That cell in which electrical energy is converted into chemical energy is called

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Galvanic cell

Electrolytic cell

Fuel cell

Daniel cell

Vapour pressure of liquid depends upon

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Amount of liquid

Surface area

Temperature

Size of container

The rate of reaction

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Increases as the reaction proceeds

Decreases as the reaction proceeds

Remains the same as the reaction proceeds

May decrease or increase as the reaction proceeds

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