Question # 1

Argon is used in filling of.

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Discharge tubes

Luminous tube

Fluorescent tubes

None of above

The coordination number of closely packed hexagonal is.

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4

6

8

12

Which of the following steps are involved in the extraction of copper.

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Roasting

Smelting

Refining

All

Which one of the following statements regarding BF3 is not correct.

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It is an ionic compound

It is an electron deficient compound

It is a Lewis acid

It forms adducts

Which of the following generally increases on going from top to bottom in a group.

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Metallic charcter

Electronegativity

Oxidising behaviour

Raducing behaviour

Of the following an amphoteric hydroxide is.

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Ca(OH)2

NaOH

Be (OH)2

Li OH

Among group IA elements, melting point

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Increases down the group

Decreases down the group

Do not show any regular trend

Remains constant

What is the following is incorrect.

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Water is more polar than H2S

H2O2 is a planar molecule

Heavy water is produced by the exhauative electrolysis of water made acidic

H2O2 act both as oxidising as well as reducing agent in acidic medium

Principal constituents of noble gases is

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Argon

Neon

Xenon

Helium

Atomicity of which of the following pair of elements is not same as hydrogen.

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Phosphorus, Nitrogen

Nitrogen, Argon

Nitrogen, iodine

Iodine, sulphur

Which of the following trihalides of nitrogen behaves as the weakest base.

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NF3

NCl3

NBr3

NI3

The geometry of Xe F2 is

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Triangular planar

Square planar

Linear

Trigonal bipyramidal

Increasing oxygen contents in oxyacids leads to.

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An increase in thermal stability

An increase in acid strength

A decrease in oxidizing power

All above

Inter halogens are of types.

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3

4

5

6

CFT was originally applied to.

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Ionic crystal

Liquid crystal

Solid crystal

All above

Which is incorrect statement for Xe F2.

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It has linear structure.

It is hydrolyzed rapidly in aqueous solution of a base

It oxidizes Cl and I to Cl2 and I 2 respectively

It cannot act as F donor

Which number of halogen family does not show positive oxidation state.

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Fluorine

Chlorine

Bromine

Iodine

A molecule MX4 has a square planar shape, The number of non bonding pairs of electrons around M is .

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2

1

0

3

Finely divided iorn combines with CO to give

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Fe(CO)3

Fe2 (CO)9

F33(CO)12

Fe(CO)6

Chlorine gas acts as a bleaching agent only in presence of.

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dry air

Moisture

Sunlight

Pure oxygen

The central metal atom or ion and the ligands that are directly attached to it are enclosed in a square bracket called.

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Coordiantion complex

Coordination sphere

Coordination number

Coordination compounds

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