Question # 1

Inert pair effect is that

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When an element shows incertness in chemical combination

When higher oxidation state is more stable than lower oxidation state

When an elecrron pair is present on the atom of an element

When two s -electrons or outermost shell remain paired and do not participate in bonding.

Which of the following is an example of super octet molecules.

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C1F3

IF7

PCl5

All the three

Example of inter molecular H-bonding is

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NH3 and H2O

HF

CH3COOH

All of abvoe

Which of the following is a pseudohalide.

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I3-

IF7

CN-

ICI

Which of the following is the most abundant alkaline earth metal.

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Be

Mg

Ca

Sr

What element is the most abundant by mass in the Earth's crust.

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Fe

H

O

K

In which of the following compounds does hydrogen bonding occur.

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CCl4

NaH

HI

NH3

Group IV A consist of elements.

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3

4

5

6

The noble gas used or treatment of cancer is

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Helium

Argon

Radon

Krypton

Colour in transition metal compounds in attributed to

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Small sized metal ions

Absorption of light in UV region

Complete ns sub shell

incomplete (n-1) sub shell

Group VII A of periodic table consist of elements.

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4

5

6

7

Which of the following pentahalides is not formed.

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NF5

PF5

AsF5

BiF5

Which among the following hydride is ionic in nature.

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Ammonia

Protium oxide

Calcium hydride

Sulphane

CFSE for d⁷ ion is.

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0.8

-0.8

-1.8

1.8

Metals are

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Transparent

Tranalucant

Opaque

None of above

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

Which of the following element has six electrons in the valence shell but cannot exhibit a maximum co valency of six.

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Sulphur

Oxygen

Selenium

Both A and B

The major role of Flurospar which is added in small quantities in the electrolytic reduction alumina dissolved in fused cryolite is.

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As a catalyst

To make the fused mixture very conducting

To lower the temperature of the melt

To decreases the rate of oxidation of carbon at the anode

Which trihalide is not hydrolysed by water

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NF3

NCl3

PCl3

AsCl3

Which of the following is not known.

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KrF6

XeF6

XeO3

KrF2

The element having electronic configuration 1s2, 2s2, 3s2, 3p3 is.

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Trivalent only

Tetravalent only

Trivalent and pentavalent

Pentavalent only

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