Question # 1

The hexagonal closed packing is associated with

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Ag, Cu, Au

Zn, Cd, Hg

Li, Na, K

NaCl, KBr

The ozone depletion in the stratophere is mainly due to the reaction of ozone with

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Freons

CFCs

Both A and B

None

The best concentration unit used for K⁺ ions present in potable water is

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ppm

Mole fraction

Molarity

Molality

Enzymes consist of

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proteins only

proteins and non-protein parts

fats only

futs and non-fatty components

Denaturation of protein means the structure of protein is disrupted indicate which factor does not denature protein

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oxidizing agent

heat protein

keeping pH 7.35

pH changes

Aniline is the derivative of the benzene containing the

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Hydroxyl group

Amino group

Amido group

Imido group

which of the following d blocks element can showthe highest oxidation number is its ompound

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Chromium

iron

Copper

Manganese

Stronger the intermolecular forces

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Lower the Vapour pressure

Greater the Vapour pressure

May be smaller or greater

None

Which of the following is pure substance

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Distilled water

, Sea water

, NaCl (aq)

Brass

The temperature in the incineration of industrial and hazardons waster process had a range:

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950 to 1300°C

500 to 900°C

250 to 500°C

900 to 1000°C

Formation of PVC form vinyl chloride is an example of

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substitution reaction

addition polymerization

condensational reaction

Aldol condensation

The color of ppts formed by Fehling's test is

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Brick red

Red

Yellow

Orange

The process of electrical coating of one metal on another to protect, decorate or to have greater resistance to corrosion is called

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Electroplating

Electrolysis

Conduction

Induction

Which is liquid among the following alkenes?

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Ethane

Propene

Butene

Pentene

General formula of alcohol is:

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ROH

Ar-OH

R-O-R

Ph-OH

Substances that render enzymes catalytically inactive are called

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Conenzymes

Substrates

Inhibitors

Apoezymes

Which compound contains - OH in their molecule

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Alcohol

Phenol

Alcohol and phenol

Ether

The number of electrons in the M shell of the element with atomic number 24 is

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24

12

13

8

Sodium should be stored in

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Air free from moisture

Air free form carbon dioxide

Under water

Under kerosene oil

Silk is an example of

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Animal fiber

Vegetable fibre

Mineral fibre

None of these

The natural fertilizers consist of

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Plants

Animals

Both plants and animals

Microorganisms

The quantum number which describes the shape of the orbital is

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Principle quantum number

Spin quantum number

Azimathal quantum number

Magnetic quantum number

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