Question # 1

The Avogadro constant is the number of.

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Atoms in 1 g of helium ga

Molecules in 35.5 g of chlorine gas

Atoms in 6 h graphite

Atoms in 24 g of magnesium

Compound which undergo sublimation is

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KMnO4

CaCO3

NH4Cl

Na2CO3

After 3 half life of a chemical reaction, amount of reactant un reactive will be.

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50%

25%

12.5%

6.25%

In endothermic reactions, the heat content of the.

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Products is more than that of reactants.

Reactants is more than that of products

Both a and b

Reactants and products are equal

The relative lowering of vapour pressure is equal to the mole fraction of the solute. This law is known as

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Ostwald dilution law

Raoult's law

Vant hoff's law

Henry's law

The power of which the concentration of a substance appears in the rate expression is known as

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order of reaction with respect to that substance

Rate of reaction

Order of reaction

Molecularity of reaction

Borax has the chemical formula.

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KNO3

Na2B3O7.10H2O

Na2CO3

NaNO3

From which quantum number is the shape of an orbital determined.

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Principal

Magnetic

Azimuthal

Spin

Which is not is state function

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Enthalpy

Entropy

Pressure

work

The number of moles of acid or base required by one dm³of buffer to alter its pH by one unit is called

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Buffer efficiency

Buffer capacity

Buffer action

None

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 known as

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Henry's law

Hess's law

Joule's principle

Law of conservation of energy

The sum of pH and pOH is

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0

7

14

10

Observed pressure is less than ideal pressure for any gas due to

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Intermolecular forces

Size of molecules

Boiling point of molecules

Both a and c

Almost forward reaction is complete when value of Kc is

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very high

Very small

Neither large nor very small

No correlation

Heat of solution of an ionic compound is equal to.

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Hydration energy

Lattice energy

Slum of both 'a' and 'b'

Difference of both a and b

Which one of the following gases diffuse more rapidly.

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Cl2

CO2

CH4

N2

Solubility curve of CaCl26H2O shows

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Decrease in solubility with increase of temperature

Increase in solubility with increase of temperature

Discontinuous increase in solubility with temperature

No effect of temperature on solubility

Cathode rays strike alumina and produce a ..........colour.

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Red

Blue

Yellow

Green

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