Question # 1

If temperature of one mole of ideal gas at 273 K and one atmospheric pressure is increased by 1 K, amount of energy absorbed is.

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0.082 dm3 atm

1.987 cal.

8.313 J

All are correct.

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 mass of one mole of electrons is

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1.008 mg

0.55 mg

0.184 mg

1.673 mg

The largest number of molecule are present.

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3.6 g of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

The change in heat energy of a chemical reaction at constant temperature and pressure is called.

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Enthalpy change

Bond energy

Heat of sublimation

Internal energy change

______ Molecule has zero dipole moment.

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CO

H2S

SO2

CH4

If an endothermic reaction is allowed to take place very rapidly in the air, the temperature of the surrounding air

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Remains constant

Increase

Decrease

Increase a bit

When water freezes, its volume increase.

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12%

9%

15%

18%

In silver oxide battery, anode is made of.

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Zinc

Copper

Lead

Graphite

One of the following substances does not undergo sublimation

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KMnO₄

Naphthalene

NH₄CI

Iodine

When water freezes at 0°C, its density decreases due to

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Cubic structure of ice

Empty spaces present in the structure of ice

Change of bond lengths

Change of bond angles

The percentage of s characters in sp3 hybrid orbital is.

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25%

33.3%

50%

75%

In case of non volatile solute, lowering of vapour pressure is proportional to.

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Mass fraction of solute

Mole fraction of solvent

Mole fraction of solute

None of the above

Chemical reactivity of different substance is controlled by

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Atomic number

Electronic arrangement

Mass number

Number of isotope of reactant elements

The diffusion of gases at absolute zero will be

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Unchanged

Zero

slightly decreases

Slightly increases

The effect of temperature on equilibrium was studied by

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Lewis

Van der wall

Arrhenius

Vant hoff

Exceptionally low acidic strength of HF is due to.

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Strong polar bond between H and F

Smaller size of fluorine

Strong hydrogen bonding

electronegativity of fluorine

Acetone and chloroform are soluble in each other due to

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Intermolecualr hydrogen bonding

Dipole-dipole interaction

Instantaneous dipoles

All of the above

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