Question # 1

Which is not use of electrochemical series.

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Feasibility of reaction

Measurement of EMF of cell

Comparison of reactivity with water or acids

Determination of atomic and ionic radii

Isotopes are the atoms of same element with similar chemical properties but different

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Atomic number

Atomic volume

Atomic weight

Atomic structure

When HCl is added to H2S aqueous solution, Its ionization

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Decrease

Increase

Remains constant

First increases than decreases

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

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

BF3 has zero while NH3 has 1.49 D dipole moment because.

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B is less electronegative than N

F is more electronegative than N

BF3 is pyramidal while NH3 is planar

NH3 is pyramidal while BF3 is trigonal planar

Which one of the following substances is used as water absorber in combustion analysis.

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Mg(CIO4)2

50% KOH

Lime water

Dilute solution of NaOH

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

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.

Vapour pressure of liquid depends upon

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Amount of liquid

Surface area

Temperature

Size of container

In which de excitation of electron of hydrogen atom maximum energy is relaeased.

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From n2 to n1

From n3 to n2

From na to n1

From na to n2

An ionic compound A⁺B^-is most likely to be formed when

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The ionization energy of A is high and electron affinity of B is low

The ionization energy of A is low and electron affinity of B is high

Both the ionization energy of A and electron affinity of B are high

Both the ionization energy of A and electron affinity of B are low

Down the VII -A group, polarizability generally.

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Increases

Decreases

Remain constant

Negligible

The boiling point of pure water at 1 atm pressure is.

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98^oC

100^oC

69^oC

120^oC

The shape of diamond crystal is.

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cubic

Hexagonal

Tetragonal

Orthorhombic

NaCI and sand can be separated by one of the following without filtration

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Formation of solution and filtration

Formation of solution and evaporation without filtration

Sublimation

Chromatiograghy

Dilatometer method is useful for the reactions that involve.

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Ionic species

Where reactant absorb U.V. visible or infrared radiations

Small volume changes in solutions

Change in refractive indices

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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