Question # 1

The formula of Borax is.

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Na2B4O7 6H2O

Na2B4O7 8H2O

Na2B4O7 10H2O

Na2B4O7 12H2O

The concentration of OH- ions in a certain household ammonia solution is 0.0025. This ammonia solution is.

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Basic

Acidic

Neutral

None of above

Helium contents in the atmosphere by volume.

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0.0005%

0.0015%

0.0001%

0.00001%

In Ostwald's process of manufacturing nitric acid a mixture of ammonia gas with air is mantained with ratio.

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1 : 4

1 :3

1: 8

1 : 10

The one in which the acceptor atom is of low positive charge, Large size and has several outer electrons which can be easily excited is a.

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Soft base

Hard Base

Soft acid

Hard acid

The noble gas which was discovered first in the sun and then on the earth is.

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Helium

Neon

Argon

Xenon

The dipole moments of the given species are such that.

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BF3 > NF3 > NH3

NF3 > BF3 > NH3

NHE > NF3 >BF3

NH3 > BF3 > NF3

Which of the following is not an alum.

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KAI (SO4)3 12 H2O

NaAI (SO4)2 12 H2O

NH4Fe (SO4)2 12H2O

FeAl (SO4)2 . 12 H2O

Reacts violently with water

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AlH3

AlCl3

Lia IH4

Al2Cl6

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

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C1F3

IF7

PCl5

All the three

Hydrometallurgy of copper involves extraction of copper from poor ores by which process.

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Dry process

Wet process

Both dry and wet process

None of these

The valence shell electronic configuration of group III A is.

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ns1 p2

ns2 p1

ns3p2

ns2p2

Major achievement of CFT is

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Interpreting the color

Adsorption spectra

Both A and B

None of above

The secondary valency of Conc. CoCl3. 6NH3.

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2

4

6

8

Copper is resistant to

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Air

Water

Acid and Alkali

All of the above

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

Which one of the following ions is colourless.

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Cu+

Co2+

Ni2+

Fe3+

Strongest inter molecular hydrogen bond is formed in

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H2O

NH3

HF

H2S

Which of the following has the greatest metallic character.

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Na

Mg

Al

Si

Among the elements A, B,C and D having atomic numbers 7,8,9 AND 12 Respectively, the element with smallest size and highest IE is.

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A

B

C

D

In group theory the triple degenerate set is denoted by

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eg

t2g

e2g

tg

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