Question # 1

Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25

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3.0 BM

4.9 BM

5.9 BM

6.9 BM

An aqueous solution is neutral when its

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pH = 14

pH = zero

pH = 7

Kw = 10^-7

The simplest separating unit of a polymer is called:

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Monomer

Dimer

Trimmer

Macromer

What is the nature of Al₂O₃

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Acidic

Basic

Amphoteric

Neutral

In physical and chemical properties, transition elements show

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Similarities

Dissimilarities

Both of these

Somestimes similarities, sometimes dissimilarities

In a group of periodic table, atomic radii is:

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Remains some.

Increases.

First decreases then increases.

Decreases.

The region of earth capable of supporting life is

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

Which of the following will have the highest boiling point?

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Methanal

Ethanal

Propanal

2-Hexanone

Which statement is true about a free radical

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An atom with a positive charge

An atom with a negative charge

An atom with a lone pair of electrons

An atom with unpaired electron

If 5.85 g of NaCl are dissolved in 90 g of water, the mole fraction of NaCl is

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0.1

0.01

0.2

0.0196

An element of the third period (Na to S) is heated in chlorine. The product is purified and then added to water. The resulting solution is found to be neutral. What is the element

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Sodium

Aluminium

Silicon

Phosphorus

A single benzene ring can have ______ ortho position maximally

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One

Two

Three

Four

The experimental relationship between a reaction rate and the concentration of reactants is called

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Order or reaction

Rate law

Activated complex

Molecularity

Which of the following represents elements in order of increasing atomic size?

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I, Br, Cl

Na, Mg, C

C, N, O

Li, Na, K

Which is a mixture of low boiling hydrocarbon

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Natural gas

Petroleum

Wood

Graphite

On heating glycerol with conc. Sulphuric acid a compound with unpleasant odour is obtained. The compound is

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Methyl alcohol

Formic acid

Prop-2-enal

Glycerol sulphate

Sintered glass is a porous material use for :

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Absorpton

Decoration.

Filtration.

All of above.

Hybridzation explain the --------- of orbitals

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Type of bonding

Shapes

Shape and type of bonding

None of above

Aspirin is

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Acetyl salicylic acid

Phenyl salicylic acid

Salicylic acid

Benzoic acid

From the following values of dissociation constants of four acids which value represents the strongest acid?

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2 x 10^-2

0.02 x 10^-1

3 x 10^-4

2 x 10^-4

In a Galvanic cell

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Chemical energy is converted into electricity

Chemical energy is converted into heat

Electrical energy is converted into heat

Electrical energy is converted into chemical energy

The nature of interparticle forces in benzene is

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Dipole-dipole interaction

Dispersion force

Ion-dipole interaction

H-bonding

The quality of petroleum is determined by

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Decane number

Octane number

Nexane number

None of these

Preparation of vegetable ghee involves:

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Halogenation

Hydrogenation

Hydroxylation

Dehydrogenation

In thermal decomposition of N₂O the half life period for two different initial concentrations of N₂O are

(i) 255 second for initial N₂O 290 mm Hg

(ii) 212 second for initial N₂O 360 mm Hg then it is

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Zero order

First order

Second order

Third order

The total number of inner transition elements in the periodic table is

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10

14

28

30

Which one of the following does not belong to alkaline earth metals

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Be

Ra

Ba

Rn

In which of these processes are smell organic molecules made into macromolecules?

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The cracking of petroleum fractions

The fractional distillation of crude oil

The polymerization of ethane

The hydrolysis of proteins

The theory of chemical bonding has been a major problem of:

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Modern Physics.

Modern Chemistry.

Modern Biology.

Mechanics.

Acetic Acid reacts with PCl₅ giving:

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Acetamid

Acetyl chloride

Alcohol

ether

which enzyme is not involved in the fermentation of starch ?

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Diastase

Zymase

Urease

Invertase

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