Question # 1

Optimum PH rang for amylases is

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6 - 6.4

6.4 - 6.6

6.4 - 6.9

6.6 - 6.9

Stronger the intermolecular forces

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Lower the Vapour pressure

Greater the Vapour pressure

May be smaller or greater

None

The value of R in term of dm³torr k^-1mol^-1

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62400

62.4

8.313

0.0821

Nihydrin reacts with amino acid to give product of

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Bluish color

Violet color

Bluish violet color

No color

A gas has non-ideal behaviour at:

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high temperature and high pressure

low temperature and low pressure

high temperature and low pressure

low temperature and low pressure

At constant pressure, if the original volume is 546 cm³at which temperature the volume of gas 552 cm³

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1°C

2°C

3°C

4°C

Buffer action can be explained by except

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Common ion effect

Le-Chatelier's principle

Law of mass action

Solubility product

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 heat of hydrogenation of most of the alkene is about

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120 kJ/mol

100 kJ/mol

140 kJ/mol

105 kJ/mol

The three dimensional folding and twisting of a polypeptide chain give rise to

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Primary structure

Secondary structure

Tertiary Structure

All of these tertiary

The main source of natural fibre is

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animal fibres

vegetables fibres

mineral fibres

all of the above

The mass of sulphur which combines with 24 grams oxygen to form SO₂

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32 gram

24 gram

8 gram

12 gram

Which of the following is not a fertilizer

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Nitrophos

Dolomite

Super phosphate of lime

Urea

Polythene is a polymer of

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Ethane

Ethene

Acetone

Propylene

Which gasses are produced from landfills

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NH₃

H₂S

N₂

All of these

Hydrolysis of protein by 6M HCl gives peptides and thenα-amino acids. How manyα-amino acids molecules are obtained on the hydrolysis of a tetrapeptide

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2

3

4

5

Natural fertilizers are materials derived from

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Plants only

Animals only

Both plants and animals

None of these

The cathodic reaction in the electrolysis of dill H₂SO₄with Pt electrodes

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Reduction

Oxidation

Both oxidation and reduction

neither oxidation or reduction

Soil salinity can be measured by

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Calorimeter

Potometer

Porometer

Conducitvity meter

Gypsum is applied to the soil to provide calcium and

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Oxygen

Nitrogen

Phosphorous

Sulphur

The electronegativeities of F,Cl,Br and I are 4.0,3.0,2.8,2.5 respectively.Hydrogen halide with a high percentage of ionic character is

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HF

HCL

HBr

HI

Alkyle magnesium halides are known as

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Simon-smith reagent

Tollen's reagent

Grignard's reagent

Barford's reagent

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