Question # 1

More abundant isotope of an element is the one with.

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Even atomic number

Odd atomic number

Even mass number

Odd mass number

The temperature of natural plasma is about.

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200000 ^oC

10000^oC

5000^oC

1000^oC

The number of electrons in one mole of hydrogen gas is.

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6.02 x 10²³

12.04 x 10²³

Only two

Indefinite

When fast neutron carries nuclear reaction with nitrogen it ejects aprticles.

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Alpha

Gamma

Beta

Nil

Isomorphic crystals show

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Same chemical properties

Same physical properties

Same crystalline form

Same melting point

Quantum number values for 3p orbitals are.

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n = 0, l = 3

n = 3 , l = 1

n = 2, l = 1

n = 2 , l = 3

The net heat change in a chemical reaction is same whether it is brought about in two or more different ways in one or several steps. It is knnown as

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Henry's law

Hess's law

Joule's principle

Law of combustion

One mole of CH₃OH and one mole of C₂H₅OH have

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Equal number of atoms

Equal number of molecules

Equal number of electrons

Equal number of protons

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

Which of the following value of heat of formation indicates that the product is least stable.

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-94 KJ

-231.6 KJ

+21.4 KJ

+70 KJ

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

In case of non volatile solute, lowering of vapour pressure is proportional to.

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Mass fraction of solute

Mole fraction of solvent

Mole fraction of solute

None of the above

The vapour pressure of an aqueous solution of glucose is.

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Equal to vapour pressure of water

Independent of temperature

More than vapour pressure of pure water

Less than vapour pressure of pure water

Under which conditions of temperature and pressure will a real gas behave most like an ideal gas.

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Low temperature and how pressure

High temperature and high pressure

Low temperature and high pressure

High temperature and low pressure

One mole of SO2 contains

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6.02 x 10²³atoms of oxygen

18.1 x 10²³atoms of SO2

6.02 x 10²³atoms of Sulphur

4 g atoms of SO2

One mole of ethanol and one mole of ethane have an equal

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Masses

Number of atoms

Number of electrons

Number of molecules

The shape of diamond crystal is.

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cubic

Hexagonal

Tetragonal

Orthorhombic

Colligative properties are used to determine the

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Freezing points

Boiling point

Atomic mass of an element

Molar mass of solute

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