Question # 1

The molal boiling point constant is the ratio of elevation of boiling point to

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Molarity

Mole fraction of solvent

Molality

Mole fraction of solute

When atoms are subjected to strong electric field, splitting of spectral lines is called.

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Zeeman effect

stark effect

Photoelectric effect

Compton effect

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Which one of the following substances is not sublime material.

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Iodine

Benzoic acid

Ammonium chloride

Potash alum

A single lead cell provides volts

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2

4

6

8

The rate of reaction

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Increases

Decreases

Remains the same

May decrease of increase

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

Weak intermolecular forces are present in.

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Only gases

Only liquid

Only solids

gases, liquids and solids

In discharge tube, properties of X-rays depend upon the nature of.

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Residual gas

Cathode plate

Anode plate

All of these

Which of the following species has unpaired electrons in anti bonding molecular orbitals

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O2

N2

B2

F2

Which one is not example of a sublimate.

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NH4Cl

I

NaCl

Benzoic Acid

In mass spectrometry, ions are produced by

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Heat at high temperature

Passing gas through high voltage plates

Throwing fast moving electrons on gas molecules

All of them

Two solution of NaCI and KCI are prepared separately by dissolving same moles of them in the fixed amount of solvent. Which of the following statements is true for these solution

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KCI solution will have higher boiling point than NaCI solution

Both the solutions have different boiling point

KCI and NaCI solution possess same vapour pressure

KCI solution possesses lower freezing point than NaCI solution

Quantum number values for 2p orbitals are.

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n = 2, 1 =1

n =1, 1 = 2

n =1, 1= 0

n = 2, 1 = 0

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

Oxidation number of Cr in a C₂CrO₄ is

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+2

+4

+6

+8

Which one of the following orbital will be filled first.

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4f

5d

3d

4s

When a chemical reaction is completed the

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Instantaneous rate > average rate

Instantaneous rate = average rate

Instantaneous rate is zero

Both average and instantaneous rates become zero

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