Question # 1

The attractive forces which are created due to repulsion of electronic cloud of the molecules are

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dipole-dipole forces

ion dipole forces

instantaneous dipole-induced dipole forces

dipole-induced dipole forces

One of the following is neutral amino acid

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Arginine

Lysine

Glutamine

Valine

Third structure of protein structure refers to

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Number and sequence of amino acids

Three dimensional structure of protein

Proteins formed of more than one monomer

Bending of protein molecule

Which one of the following is an appropriate indication of positive iodoform test?

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Formation of H2O

Brick red precipitate

Release of H2 gas

Yellow precipitate

Fine powder gypsum is mixed with clinker up to:

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4%

6%

5%

7%

If the number of gas molecules are doubled in the certain volume the pressure is:

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Increased to four times

Remains unchanged

Doubeld

Decrease to half

Smaller unit of biosphere is:

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specie

ecosystem

plankton

troposphere

Liquids evaporate at every temperature. When the temperature becomes constant for a liquid, then:

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rate of evaporation is greater than the rate of condensation

the rate of condensation is greater than the rate of evaporation

The rate of condensation and evaporation become equal

it depends upon the nature of the liquid

Which of the following amino acid is named due to its taste

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Alanine

Lysine

Valine

Glycine

Which of the following wast material is not recycled for use again?

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glasses

paper

plastic toys

hides of animals

According to Boyles law, at constant temperature the product of pressure and volume of a given mass of gas is

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whole number

a constant

fraction

a multiple

Which carbonate of alkali metals is insoluble in water

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Na₂CO₃

K₂CO₃

Li₂CO₃

Cs₂CO₃

When formaldehyde is added to Grignard reagent we get

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Aldehyde

Acetone

Primary alcohol

Secondary alcohol

Organic acid without a carboxylic acid group is

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Ascorbic acid

Vinegar

Oxalic acid

Picric acid

Zn does not displace Mg from MgSO₄solution because

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Zn is more electropositive than Mg

Zn is below Mg in electropositive series

Zn is above Mg in electrochemical series

Zn is trivalent Mg is divalent

The toxic organic compounds and heavy metals and metalloids results in contamination of

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Surface water

Ground water

Both surface and ground water

Neither surface nor ground waters

Extent to H₂ + L₂à2Hl can be increased by :

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Increasing temperature.

Increasing product.

Increasing pressure.

Adding a catalyst.

Purification of an impure copper is made by electrolytic cell, in which impure copper is anode and pure copper is cathode, and the electrolyte used is

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H₂SO₄

CuSO₄

ZnSO₄

Na₂SO₄

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

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Phenol

Aldehyde

Ketones

Carboxylic acids

Major component in cement is :

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SiO₂

Lime

Al₂O₃

MgO

The fractions obtained from fractional distillation of petroleum are placed in increasing order of their boiling points. Which order is correct

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Natural gas, petroleum ether, gasoline kerosene

Petroleum ether, kerosene, natural gas, petroleum ether

Gasoline, kerosene, natural gas, petroleum ether

Kerosene, gasoline, petroleum ether, natural gas

In a group form top to bottom, the hardness of alkali metals

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Remains unchanged

Increases

Decreases

None

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