Question # 1

The lightest value of lattice energy is for which one of these ionic compounds.

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NaI

NaF

NaBr

NaCl

Chromatographic technique is very useful for

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Isolation

Purification

separation

All of them

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

Which of the following molecules has a co-ordinate covalent bond

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NH₄CI

NaCI

HCI

AICI₃

Solvent extraction method is a particularly useful technique for separation when the product to be separated is.

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Non volatile or thermally unstable

Volatile or thermally stable

Non volatile or thermally stable

Volatile or thermally unstable

Which of the following has coordinate covalent bond.

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NH4

NaCl

HCl

AlCl3

Which statement is incorrect about Dempster's mass spectrometer.

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Solid sample can be used in this mass spectrometer

Ions are detected on the basis of mass to charge ratio

Atoms or molecules are ionized with beam of electron.

This spectrometer work at one atmospheric pressure.

In gas occupies a volume of 2 dm³at 27°C and I atm pressure. The expression for its volume at S.T.P. is

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A chemical reaction A ---------- B is said to be in equilibrium when

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Complete conversion of A to B has taken place

Conversion of A to B is 50% complete

Rate of transformation of A to B is equal to B to A

50% Reactant have been changed to B

pKa of CH3COOH is 4.74. The pKb value of CH3COO- ions will be

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7

14

9.26

zero

Gas equation is derived by combining

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Avogadro's and Charles's Law

Boyle's and Charles's Law

Avogadro's and Boyle's Law

Avogadro's, Boyle's and Charles's Law

In endothermic reactions, the heat content of the

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Products is more then that of reactants

Reactants is more than that of products

Both a and b

Reactant and products is equal

The electrode reaction of a voltaic cell can be reversed when

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Concentrations of solutions are changed

Temperature is increased

Electrodes are interchanged

Electric circuit is employed to supply the source of electricity

The cell in which a non spontaneous redox reaction takes place as a result of electricity is known as.

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Voltaic cell

Denial cell

dry Cell

Electrolytic cell

How should the conditions be changed to prevent the volume of a give gas from expanding when its mass is increased.

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Temperature is lowered and pressure is increased.

Temperature is increased and pressure is lowered

Temperature and pressure both are lowered

Temperature and pressure both are increased

When 5d orbital is completed them entering electron goes into.

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6s

6p

6d

6f

In the ground state of an atom, the electrons is present.

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In the nucleus

In the second shell

Nearest to the nucleus

Farthest form the nucleus

Equal masses of methane and oxygen are mixed in an empty container at 25°C, the fraction of total pressure exerted by oxygen is

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1/3

8/9

1/9

16/17

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