Question # 1

Metallic magnesium is obtained by

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Reduction of MgO with Coke

Electrolysis of an aqueous solution of MgCl2

Electrolysis of molten MgCl2

Displacement of magnesium by iron form MgCl2 solution.

The percentage of nitrogen in ammonium sulphate is__________%

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27

21

23

19

When to a solution of weak electrolyte a strong electrolyte with a common ion is added, the dissociation of weak electrolytes is suppressed . This is known as.

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Stark effect

Salt effect

Common ion effect

Zeman effect

Which of the following statement is not correct regarding dissociation constant (Ka)?

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It is a measure of the tendency of an acid to split up into ions

The greater the value of Ka, more is the dissociation

It is determined by conductimetric method

It is not a proper parameter for weak acids

PCl5 is an example of hybridization

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d sp³

d2 sp2

sp2

sp3

1 meter = ___________ nm

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10⁹

10^-9

10¹⁰

10^-10

Attention should be focused on qualitative changes in particle properties as a function of.

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Particle numebrs

Particle mass

Particle size

Particle density

Which of the following carbonates decomposes at the highest temperature.

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Mg CO3

CaCO3

Sr CO3

Ba CO3

Which of the following sets of quantum number is possible.

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n = 4, l = 3, m = -3 ,s = 0

n = 4, l = 0, m = 0, s =+1/2

n = 4, l = 4, m = -4, s = -1/2

None of these

The most electronegative element of the third period is.

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F

P

Br

Cl

A salt solution is treated with chloroform drops.Then it is shaken with chlorine water, chloroform layer become violet solution contains.

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NO2 ion

NO3 ion

Br ion

I- ion

Glass obtained by placing a layer of butyral plastic with a suitable adhesive between two layers of glass and cementing them by heat and pressure is called.

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Glass wool

Safety glass

Optical glass

Jena glass

XeF4 is obtained, when a mixture of Xenon and fluorine in the ratio is heated in a nickle vessel at 400 ^oC

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1 : 3

5 :1

1 :20

1 :5

The electromagevitiy of the following elements increase in the order

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F > Cl > O > S

S > Cl > O > F

F > O > N > C

C > O > N > F

Which of the following statement is incorrect.

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An alloy is a mixture of two or more metals

An alloy is a mixture of two or more metal and non metal elements that have metallic properties

An alloy has a fixed composition

An amalgam is an alloy containing Hg

Which of the following enthalpies is always negative.

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Enthalpy of melting

Enthalpy of combustion

Enthalpy of solution

Enthalpy of formation

Which of the following acid radical is not interfering.

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Phosphate

Borate

Flouride

Sulphate

Which of the following phenomena is not explained by the classical mechanics.

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Black body radiation

Photoelectric effect

Atomic and molecular spectra

Heat capacities of solids

All of the above

The electronic configuration of sodium (Z=11)

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1s2, 2s2, 2p4

1s2, 2s2, 2p6, 3s2 , 2p5

1s2, 2s2, 2p6, 3s1

1s2, 2s2, 2p6, 3s2

Phenol on reaction with ethanoic anhydrides in the presence of sodium ethanoate gives.

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Phenyl benzoate

Ethyl benzoate

Phenyl ethanoate

Phenyl methyl ether

Halogens are coloured because.

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They are strong oxidant

Their molecules are held together by weak van der Waals forces

Their atoms absorb radiations form visible range causing the excitation of valence electrons to higher energy of levels

Their molecules absorb light radiation forming the oxcited state.

Which of the following substance is not weak electrolyte.

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CH3COOH

NH4OH

Oxalic Acid

NaCl

Sodium metal cannot be stored under

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Hexane

Benzene

Kerosene

Ethanol

A molecule the cannot be susperimposed on its mirror image is said to exhibit which of the following.

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Geometrical isomerism

Optical isomerism

Linkage isomerism

Reactive isomerism

Which of the following is capable of shown g optical isomersm.

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CH3COCOOH

CH3CHOHCOOH

Botha a and b

All of these

Vet days are generally applied to the fabric in the form of.

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Mordants

Leuco base

Oxidised base

Dispersed dyes.

A unit cell having dimension , a = b c, alpha, beta, gama = 90^o is known as.

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Cubic

Hexagonal

Orthorhombic

None of them

The number of vibrational degree of freedom for CO2 is

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2

3

4

5

Which of the following equations represent linear free energy relationship.

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Hammett equation

Taft equation

Helmholtz equation

Differential equation

When a large block of silicon wafer is reduced to smaller component and hence non material is formed this approach is called.

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Bottom up

Top down

Left to right

Right to left

Which of the following chloride is soluble in hot water.

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Hg2Cl2

AgCl

PbCl2

All above

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