Question # 1

One of the following substances is not used as a drying reagent in a desiccator

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Cons. H₂SO₄

P₂O₅

Silica gel

50% KOH

Mass of 22.4 dm3 of N2 at STP is.

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28 gm

14 gm

1.4 gm

2,8 gm

The bond angle in NH3 molecule is

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109.5^o

107.5^o

104.5^o

106^o

The boiling point of water at the top mount Everest is.

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59^oC

69^oC

83^oC

75^oC

A solution of sucrose is 34.2% The volume of solution containing one mole of solute.

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500 cm3

1000 cm3

342 cm3

3420 cm3

Which concentration unit is independent of temperature.

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Molarity

Molality

ppm

both a and b

What happens to the enthalpy change when the coeffficients of a chemical equation are douubled

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It doubles

It becomes half

It does not change

It cannot be predicted

Stronger the oxidizing agent greater is the

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Oxidation potential

Reduction potential

Redox potential

E.M.F of cell

Which one of the following enthalpies is always an exothermic process.

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Enthalpy of atomization

Enthalpy of neutralization

Enthalpy of ionization

Enthalpy of dissociation

In Daniel cell, if salt bridge is removed between the two half cells, the voltage.

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Drops to zero

Does not changes

Increases gradually

Increases rapidly

The bond order of N2 molecule is.

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1

2

3

4

Which of the following solutions will have the highest boiling point

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0.1 M NaCI

0.1 M CaCI₂

0.1 M FeCI₃

0.1 M glucose

Dipole Moment of H2O is.

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1.61 D

1.85 D

0.95 D

1.49 D

Conductivity of metal decreases by increasing temperature because.

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Atoms are converted to ions

Atoms oscillates and hinder the movement of free electrons.

Ions are converted into atoms

Velocity of mobile electrons increases

Which substance is nto a dehydrating agent.

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CaCl3

CdCl2

Silica gel

P2O5

Kw for water at 0 oc is 0.1 x 10^-34 and at 100 ^oC 7.5 x 10^-14, How many times dissociation of water increase from 0 ^oCto 100 ^oC

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7.5 times

50 times

75 times

100 times

Standard hydrogen electrode has an arbitrarily fixed potential

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0.00 volts

1.00 volt

0.10 volt

None of these

27g of Al will react completely with how much mass of O2, to produce Al2O3.

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8 g of oxygen

16 g of oxygen

32 g of oxygen

24 g of oxygen

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