Question # 1

Which of following is NOT use the polyvinylacetate (PVA)

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An adhesive material

Binder for emulsion

Used as gramophone

None as these

Residence time of methane in the atmosphere is

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3 - 7 days

2 -3 days

3 - 7 years

2 - 3 years

The % age of nitrogen in ammonia is:

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80%

92%

90%

50%

Atoms having same mass number but different atomic numbers are called.

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Isotopes

isobars

Isotones

isomers

Fatty acids are:

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Aliphatic mono-carboxylic acids

Di-carboxylic acids

Tri-carboxylic acids

Tetra carboxylic acids

Poly carboxylic acids

The main pollution of leather tanneries in the waste is due to the salt of

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Chromium

Copper

Chromium

Lead

Nucleic acid fist descovered in

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1868

1869

1900

1905

Which forms metallic cyrstals

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Cu

NaCl

Diamond

None

In order to maintain the boiling point of water at 110 C°, the extemal pressure should be

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550 torr

between 500 and 760 tor

between 760 and 1500 torr

any pressure can be maintained

In the atosphere, CO₂is about

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0.01%

0.03%

0.05%

0.09%

lonization of KCIO3. is suppressed by

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Increasing temperatuse

adding KCl

adding NaNO3

Decreasing temperature

Among the following the most reactive towards alcoholic KOH is

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CH₂= CHBr

CH₃COCH₂CH₂Br

CH₃CH₂Br

CH₃CH₂CH₂Br

The correct order of electron affinity among the following is

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F > Cl > Br

Br > Cl > F

Cl > F > Br

F > Br > Cl

In which of the following theories the hybridizationis considered

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Vsepr

Lewis

Molecule orbital

Valence bond

When the 6d orbital is completed the entering electron goes into

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7f

7 s

7 p

7 d

Aspirin is

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Acetyl salicylic acid

Phenyl salicylic acid

Salicylic acid

Benzoic acid

In an ooctahedral crystal field splitting, the number of orbitals pushed down in energy is

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3

2

5

Zero

Which of the following is the repeating monomeric unit in cellulose

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Sucrose

Maltose

Cellobiose

Glucose

The equilibrium constant in a reversible chemical reaction at a given temperature

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Depends on the initial concentration of the reactants

Depends on the concentration of one of the products at equilibrium

Does not depend on the initial concentration of rectants

It is characteristic of the reaction

Which of the following is not present in RNA?

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Uracil

Thymine

Ribose

Phosphate

Ozone is not

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An allotrope

A powerful oxidizing agent

Paramagnetic

A bent molecule

Rate law of an equation is obtained :

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From a balance equation.

Can be calculated theoretically as well as determined experimentally.

It is only calculated theoretically.

Experimentally.

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