Question # 1

Which of the elements of group II A has the highest value of IE.

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Mg

Be

Ca

Sr

The purification of Bauxite can be carried out.

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Baeyer's process

Hall's process

Serpek's process

Any of above

Transition elements, in general, exhibit the following properties, except one, Name that property.

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Variable oxidation state

Natural radioactivity

Tendency to form complexes

Formation of alloys

The most electronegative element of the third period is.

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F

P

Br

Cl

The process in which ore is heated generally in the presence of air, at temperature below their melting points is called.

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Calcination

Roasting

Fourth floatation

besemerization

Oxygen and sulphur exist in state

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Free

Combined

_{Both free & combined}

None of above

Bryllium salts on hydrolysis give.

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Basic solutions

Acidic solutions

Neutral solutions

Amphoteric solutions.

Co ordinate compounds are

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Polar

Non polar

Dem polar

None of above

The inert gasses AR, Ka, and Xe form solid compounds with certain organic molecules under pressure..

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Halides

Hydrates

Clathrates

All of above

Un-like s -block elements d-block elements form which compounds as well

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ionic compounds

Co valent compound

Co ordinate compounds

None of above

Which of the following compounds has highest boiling point.

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HI

HF

HBr

HCl

With which one of the following configurations, the lowest value of first IE is associated.

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Is2, 2s2, 2p6, 3s1

1s2, 2s2, 2p5

1s2, 2s2, 2p6

1s2, 2s2, 2p6, 3s2, 3p2

The structure of SO2

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Linear

Angular

V-shaped

Planner

The most convenient and has nearest approach to a universal pH measurement

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pH strips

pH indicator

The emf method

The colorimetric

Which of the following has maximum number of unpaired electrons.

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Fe3+

Fe2+

Co2+

CO3+

All halogens exist as covalent molecules.

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Monoatomic

Daitomic

Triatonic

Tetra atomic

The specific gravity of H2SO4 is

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1.37

1.84

1.17

1.57

The element having highest ionization energy and least electron affinity belong to

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Period 1 , group 18

Period 2, group 17

Period 2, group 1

Period 2, group 2

The pH of the tears is

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7.0

7.4

7.8

8.2

A type of a chemical bond which is formed by the mutual sharing of electrons between combining atoms of the same or different elements is called.

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Ionic bond

Covalent bond

Co ordinate Covalent bond

Metallic bond

The role of the mineral cryolite Na2AlF6 in the Hall process for aluminum production is.

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It is the source of aluminum

it is a chemical reducing agent

It forms a slag to remove impuriteis

In the molten state, it is a solvent for alumina Al2O3

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