Question # 1

In group V-A elements the most electronegative elements is

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Sb

N

P

As

Which one is metaphosphoric acid

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HPO3

H3PO3

H3PO4

H4P2O7

When concentrated H2SO4 and solid sodium chloride react together at room temperature the product are.

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Two salts only

A salt and a base

A salt and an acid

A salt and water

Role of H2S in the given chemical reaction is H2S + I2--------------- 2HI+S

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Oxidising agent

Reducing agent

Dehydrating agent

As an acid

An element has oxidation state -2, +4, +6 in its compounds. In which group in the periodic table is this element likely to be.

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Grooup III A

Group IV A

Group V A

Group VI A

Lowest oxidation state of nitrogen is present in.

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NH3

NO2

NO

HNO3

Which metal is redered passive by HNO₃due to formation of a film of metal oxide over the metal

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Pt

Sn

CO

Mn

What is %age of calcium phosphate in bone ash

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20

40

80

60

Oxidation of NO in air produces

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N₂O

N₂O₃

N₂O₄

N₂O₅

The brown gas formed when metal reduces HNO₃

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N₂O₅

N₂O₃

NO₂

NO

Which element does not have allotropic form

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Nitrogen

Phosphorous

Arsenic

Antimony

Which catalyst is used in contact process

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Fe₂O₃

V₂O₅

SO₃

Ag₂O

P2O5 is usually used as

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Drying agent only

Reducing agent

Both drying and reducing agent

Both drying agent and oxidizing agent.

Arsenic impurities in contact process are removed.

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By prolong heating the gases

By treatment with Fe(OH)3

In scrubbing tower

In absorption tower

The element which is present in earth crust about 50% is

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Oxygen

sulphur

Carbon

Nitrogen

The reaction between Cu and conc. H2SO4 produces

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SO3

SO2

H2

Cu + ions

The most electronegative element of group V-A is

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N

P

Sb

Bi

When Cu reacts with conc. HNO3 , which one of the following gases is evolved

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N2O

NO

NO2

N2O5

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