Question # 1

Maximum number of unpaired electrons is in

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O₂

O₂⁺

O₂^-

O₂^2-

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

Most likely product formed when formic acid is dehydrated in the presence of conc. H2SO4 is.

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CO2 and H2O

CO, CO2 and H2O

CO2 and H2

CO and H2O

NH4NO3 on heating at 200 ^oC changes to

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N2O

NO

NO2

N2O4

The reaction between Cu and conc. H2SO4 produces

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SO3

SO2

H2

Cu + ions

The brown gas formed when metal reduces HNO3 is

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N2O5

N2O3

NO2

NO

In group V-A elements the most electronegative elements is

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Sb

N

P

As

Chemical formula of stibnite on.

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BaSO4

Sb2S3

FeS2

ZnS

Which of the following specie has the maximum number of unpaired electrons.

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O2

O2+

O2-

O2^-2

Sulphuric acid acts as dehydrating agent in its reaction with.

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Sodium chloride

Potassium nitrate

Copper

Ethyl alcohol

The most electronegative element of group V-A is

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N

P

Sb

Bi

Which raw material is used for manufacture eof HNO3 by Birkland eyed process

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NH3 and CO2

Air

Air and gypsum

Lime stone and urea

Lowest oxidation state of nitrogen is present in.

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NH3

NO2

NO

HNO3

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

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AuF₃

AuCl₃

AuBr₃

AuI₃

Out of the elements of group VA, the highest energy is possessed by

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N

P

Sb

Bi

Which catalyst is used in contact process.

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Fe2O3

V2O5

SO3

Ag2O

SO2 is not absorbed in water directly to form H2SO4 because.

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The reaction does not go to completion

The reaction is quite slow

The reaction is exothermic

SO3 is insoluble in water

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