Question # 1

Percentage ionic character of HF is.

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100%

80%

43%

57%

The element nickel has isotopes.

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3

2

5

7

Boiling point of a liquid is high when

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There is no hydrogen bonding

Dipole moment is zero

Inter molecular forces are weak

Hydrogen bonding is present

According to Boyle's law which parameters give a straight line parallel to x -axis when we plot a graph between

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P and V

P and 1/V

P and PV

V and T

The wave number of the light emitted by a certain source is 2 x 10⁶m^-1The wave length of this light is.

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500 nm

500 m

200 nm

600 m

The oxidation number of C in C12H22O11 is

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Zero

- 6

+ 6

12

Dipole moment of CO2 is.

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1.25 D

1.85 D

3.1 D

Zero

Which of the following molecules have unpaired electrons is the bonding molecular orbitals.

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N2

O2

B2

F2

When hot saturated solution is cooled very rapidly, we get

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Medium sized crystals

large sized crystals

Premature crystallization of the substance

Old crops of crystals

Which of the following statement is contrary to the first law of thermodynamics

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An equivalent amount of heart energy can neither be created nor destroyed

One form of energy can be transferred into an equivalent amount of other kinds of energy

In an adiabatic process, the work done is independent of its path

Continuous production of mechanical work without supplying an equivalent is amount of heat possible

An atomic orbital has l =1 , m =+1, 0, -1, n = 3 than which one of the following atomic orbital has such values.

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2s

2p

3p

3d

If the energy of the activated complex lies close to energy of reactants, it means that reaction is

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Slow

Fast

Exothermic

Endothermic

How many moles of CO are present having 12.04 x 10²³molecules of CO2.

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0.5 mol

1.0 mol

1,5 mol

2.0 mol

Which one is not example of a sublimate.

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NH4Cl

I

NaCl

Benzoic Acid

The net change in a chemical reaction is same whether it takes place directly or indirectly is

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Henry's law

Charles's

Hess's lass

Graham's law

In which of the following changes, nitrogen in reduced.

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NH3 to NO

NH3 to NO3

N2 to NH3

N-3 to N2

Splitting of spectral lines when atoms are subjected to strong electric field is called

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Zeeman effect

Stark effect

Photoelectric effect

Compton effect

An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ions in the filtrate

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