Question # 1

Which one of the pollutants of automobile exhausts affects the nervous system or produces mental diseases?

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NO₂

SO₂

Hg

Pb

How is the secondary structure of protein stabilized

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Through hydrogen bonding

Through ionic bonding

Through van der wall forces

Through covalent bonding

All of the following are simple proteins except

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Histones

Albumin

Keratins

Glycoprotein

Purines include

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Adenine

Guanine

Both a and b

None

2,5-dimethyl-1-hexene has

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Two sp2 hybridized carbons

Six sp2 hybrid carbons

Two double bonds

Four pi electrons

Two or more similar monomers combine to form:

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Homopolymer

Copolymer

Ter polymer

Thermoplastic polymer

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

One mole of SO2 contains

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6.022 x 10(23) atoms of oxygen

6.022x 10 ê23 atoms of sulfur

18.1x 10 (23) molecules of SO2

4 g molecule of SO2

Cyclonite is a powerful:

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explosive

antiseptic

analgesic

anti-inflammatory

What is not correct about ∆HF

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It is always negative

Ìts value gives an idea about the relative stability of reactants and the products.

Its value can be greater or less than zero

Value depends upon nature of bonds

The substance used in the soil to provide element.Which are essential for plant growth are known as:

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manures

fertilizers

pesticides

additive

Purines include

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Adenine

Guanine

Both a and b

None

Isotopes differ in the

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Number of neutrons

Number of protons

Number of electrons

Number of atoms

When H₂and I₂are mixed and equilibrium is attained, then

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Amount of HI formed is equal to the amount of H₂dissociated

HI dissociation stops

The reaction stops completely

None of these

Which of the following is not present in nucleotide?

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Guanine

Cytosine

Adenine

Tryoxine

Organic compounds containing halogen atom are called:

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R---OH

R----X

R----NH₂

R----COH

Reaction of Griganard's reagent with CO₂gives:

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Aldehyde

Pri-alcohol

Sec-alcohal

Carboxylic acid

Any substance under going physical or chemical change is said to be

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Surrounding

System

Losphere

Lithosphere

Ultraviolet radiation from sun causes a reaction that produces

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Fluorides

Carbon monoxide

Sulphur dioxide

Ozone

Which of the following compounds does not react with NaHSO₃?

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C₆H₅CHO

Acetophenone

Acetone

Acetaldehyde

What element is not essential the growth of plants and is not required in the fertilizers

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Nitrogen

Potassium

Phosphorus

Barium

The substances which soften the polymer are called

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Stabilizers

Plasticizers

Retarders

Pigments

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