Question # 1

Maximum number of unpaired electrons is in

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O₂

O₂⁺

O₂^-

O₂^2-

The composition of oleum is.

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H2SO4

H2S2O3

H2S2O7

H2S3O7

Gold dissolves in "Aqua Regia" due to formation of Halide. Point out correct halide

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AuF₃

AuCl₃

AuBr₃

AuI₃

Which of the following is a reddish brown gas

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N₂O₃

NO₂

N₂O₃

N₂O₅

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

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N2O

NO

NO2

N2O5

Which statement is incorrect about H2SO4

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Dehydration agent

dibasic acid

Oxidizing agent

Reducing agent

The reaction between concentrated H2SO4 and glucose give carbon and water. In this reaction H2SO4 acts as.

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An acid

An oxidising agent

Dehydrating agent

A reducing agent

Sulphuric acid acts as dehydrating agent in its reaction with.

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Sodium chloride

Potassium nitrate

Copper

Ethyl alcohol

Which one of the following does not react with dilute sulphuric acid.

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Mg (OH)2

Mg

MgO

Mg(NO3)2

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.

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

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Oxygen

sulphur

Carbon

Nitrogen

Chemical formula of stibnite on.

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BaSO4

Sb2S3

FeS2

ZnS

Laughing gas is chemically

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NO

NO₂

N₂O

N₄O₄

Which catalyst is used in contact process.

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Fe2O3

V2O5

SO3

Ag2O

Which form of phosphorus is more stable.

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White

Red

Black

Both a and b

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

In aqua regia, the ratio of conc. HCl to Conc. HNO3 is

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1 : 1

2 :1

1:2

3 : 1

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