Question # 1

Tertiary structure of proteins involves EXCEPT

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Domains

Globular

Fibrous

Beta sheets

Reactivity of carbonyl compounds is due to

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Electrophilic carbon

Less stearic hindrance

Unsaturation of Co

Polarity of bond

All the following statements are incorrect except:

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all of the gases cannot be liquefied

increase of pressure will not decrease the inter molecular distance in a gas

gas molecules do not attract each other at very low temperature

actual volume of a gas is not negligible at very pressure

One degree on Celsius scale is ______ time greater then Fahrenheit scale

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9/5

5/9

6/5

5/6

Heat balance of earth is maintained by sphere:

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Hydrosphere

atmosphers

lithosphere

biosphere

At compromise distance the forces dominating between atoms are

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repulsive forces

attractive forces

Dipole induced dipole force

H-bonding

Born-Haber cycle is an application of

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Hess's law

1" law of thermodynamics

Avogadro's law

1law of thermochemistry

In SO-²4 the oxidation number of sulphur is

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-8

-6

+8

+6

One kilo calorie is equal to

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4.184J

1000J

4184J

1kJ

A large hole in the ozone layer over antarctica region was discovered in:

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1960s

1970s

1980s

1990s

Rusting of iron metal Fe occurs when Fe gets converted into Fe2O3 What happen with Fe?

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F'e is neutralized

Fe is sublimed

Fe is reduced

Fe is oxidized

At certain temperature, 50% of HI is dissociated into H₂and I₂the equilibrium constant is

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1.0

3.0

0.5

0.25

Which compound on reaction with hydrogen cyanide produces a compound with a chiral centre

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Ch₃CHO

CH₃CH₂COCH₂CH₃

CH₃CO₂CH₃

HCHO

N₂3H₂⇌ 2NH₃

_{Which of the following change will favorthe formation of more}NH₃at equilibrium in above reaction :

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By adding NH_3.

By removingH_2.

By decreasing pressure.

By increasing pressure.

Peat contains about

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60% carbon

80% carbon

78% carbon

50% carbon

A double bond consists of:

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Two sigma bonds

One sigma and one pi bonds

One sigma and two pi bonds

Two pi bonds

The disaccharide present in milk is

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Sucrose

Maltose

Lactose

Cellobiose

Enzymes catalyse all biological reactions occurring in the cell. What is true about an enzyme

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Enzyme is a small molecule

Enzyme is acidic in nature

Enzyme is a protein

Enzyme is a lipid

Formula of acetone is:

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HCHO

CH₃CHO

CH₃OCH₃

CH₃OC₂H₅

The organic compounds containing Ph--OH group are called:

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Phenol

Aldehyde

Ketones

Carboxylic acids

In passage of electricity through aqueous solution of AgNO₃silver dissolves at anode to form Ag⁺, the electrodes are

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Silver metal

Pt metal

Graphite

Copper metal

When methane reacts with Cl₂in the presence of diffused light the products obtained are

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Chloroform only

Carbon tetrachloride only

Chloromethane and dichloromethane

Mixture of a, b, c

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