Question # 1

Most harmful of biosphere is

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Deforestation

Nuclear fail out

Salinity

Water logging

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

The gasses in the atmosphere are essential for sustaining life on earth; Thus oxygen is required for breathing, What for is carbon dioxide required?

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to help plant to under go photosynthesis

to destroy nitrogen oxide form the atmosphere

to help to clean to atmosphere

to help in fixing of bacteria

Air at sea level is dense.This is a practical application of

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Boyle's law

Charle's law

Avogadro's law

Dalton's law

In which of the following processes are small organic molecules made into macromolecules

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The cracking of petroleum fractions

The fractional distillation of crude oil

The polymerization of ethene

The hydrolysis of protein

Which of the following bond is responsible for joining the amino acids in proteins?

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Metallic Bond

Di sulfide bond

Peptide Bond

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

In elimination reaction i.e, in the formation of alkene, the reactivity of alkyl halide is in the order:

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CI>Br>I

I>Br>Cl

Br>CI>I

I>CI> Br

What will be the shape of a molecule which containstwo sigma bond pairs and one lone pair?

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Linear

V shape

Tetragonal

Triangular

The electrochemical series is based on

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pH scale

Redox scale

Hdrogen scale

Arrhenius scale

Which one is a non-polar compound?

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SnCl2

PH3

Gecl4

H2O

The electrode through which the electrons enter the electrolytic solution is electrolytic solution is

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Anode

Cathode

May be anode or cathode

None of these

Charge to mass ratio of electron was discovered by:

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Millika.

Rutherford.

J.J. Thomson.

Chadwick.

Polymer formation from monomers starts by

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Condensation reaction between monomers

Coordination reaction between monomers

Conversion of monomer to monomer ions by protons

Hydrolysis of monomers

Which of the following is an electrophile

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Bromine

KBr

NH₃

Benzene

Cracking done at low pressure and with a catalyst is called _______ cracking

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Thermal

Catalytic

Steam

None of them

Which is a reagent for Lucas test

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ZnCl₂+ Conc. HCl

Zn

Na

Br

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

Which is used as an antifreeze?

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Glycol

Ethyl alcohol

Water

Methanol

Silk is an example of

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Animal fiber

Vegetable fibre

Mineral fibre

None of these

An organic compound 'X' on treatment with acidified K₂Cr₂O₇gives a compound 'Y' which reacts with I₂and sodium carbonate to form Triodomethane. The compound 'X' is

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CH₃OH

CH₃CHO

CH₃CH(OH)CH₃

CH₃COCH₃

Monosaccharides belong to the group

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Lipids

Fats

Proteins

Carbohydrates

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