Question # 1

Which molecules is 100% covalent

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H2

H2O

HF

NH3

Which one of the following salts dissolved in water to form a solution with a pH greater than 7

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NaCl

CuSO4

Na2CO3

NH4Cl

Which of the following represents electronic configuration of the most electropositive elements

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He [ 2s^-1]

Xe [6s¹]

He [2s²]

Xe [6s²]

Safe and reliable method of drying crystals is through.

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Pressing it between folds of filter paper

Drying it in oven

Evaporation of solution

Vacuum desiccator

The paper at which separation of solute have been taken place is called.

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Retardation factor

Chromatogram

Base line

Solvent front

Keeping the temperature constant of the gas is expanded.

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Pressure will decrease

Temperature will increase

Kinetic energy of molecules will increase

No. of gas molecules increases

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

Actual yield is mostly less than the theoretical yield due to the reason that

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Rates of reactions are slow

Loss of the product during handling

Reactions are never completed 100%

Law of conservation of mass is not true

Which one of the following correctly describe the shape of NH3 molecules.

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tetrahedral

Pyramidal

Angular

Square planar

Quantum number values for 2p orbitals are

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n = 2, l = 1

n =1, 1 = 2

n =1, l = 0

n = 2, l = 0

One of the following statements about Born-Haber cycle is correct. Which is that statement

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Born-Haber cycle is different from Hess's law

The energy change in a cyclic process is not zero

The lattice energy of the crystalline substances can be calculated easily

Heat of formation of the product and the lattice energy of the substance can be calculated simultaneously

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 molarity of 2% w/v NaOH solution is

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2

0.25

0.05

0.5

Nickel has isotopes

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3

5

6

11

Which has greater reduction potential

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Na

H2

Zn

F2

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

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500 nm

5000 nm

200 nm

5 x10⁷ m

Rate of a chemical reaction generally increase rapidly even for small increase in temperature because of rapid increase in the

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Collisions frequency

Activation energy

Average KE of molecules

Fraction of molecules with energies more than activation energy

Which of the following is psuedo solid

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CaF2

Glass

NaCl

All

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