Question # 1

Fungicides are the pesticides which:

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Kill plants

Kill insects

Kill herbs

Control the growth of fungus

The mono atomic gas molecules are ______ gas molecules

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Halogen

Zero

Noble

Both b and c

Formation of Picric acid from phenol needs heating, one possible reason for it is

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acidity of phenol

e- donating nature of-OH

acidity of picric acid

e- with drawing effect of- NO2

Which of the following solids does not have a covalent bond?

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Silica

Copper

Diamond

Graphite

The electrochemical series is based on

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pH scale

Redox scale

Hdrogen scale

Arrhenius scale

Real gases deviate from the ideal behaviour at very

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high pressure

low temperature

low pressure

both a and b

Plasma was introduced by

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Crookes

Soddy

Faraday

Van der Waal

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

Asbestos is commonly used in making

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wall board

black board

soft board

hard board

Why a C- C bond breaks by uv light

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Cl is most electronegative

Cl is volatile

C - Cl bond energy is smaller than that of C - H bond energy

uv light provides energy which is sufficient to break C - Cl bond and not C - H bond

Acetylide can give back ethyne upon treatment with

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water

strong base

dil. Acid

weak base

Wohler synthesized first of all the organic compound:

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Carbohydrates

Urea

Aniline

Toluene

Sodium forms largely

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Normal oxides

Per-oxides

Superoxides

None of these

The formula of esters is

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Nylon, 6,6 is a condensation polymer of

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Adipic acid and glycol

Phthalic acid and glycol

Adipic acid and hexaethylene diamine

Pthalic acid and hexaethylene diamine

In a Galvanic cell, the electrons flow from

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A node to cathode through the solution

Cathode to anode through the external circuit

Anode to cathode through the external circuit

Which of the following undergoes uncleophilic substitution exclusively by S_N1 mechanism?

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Benzyl chloride

Ethyl chloride

Chlorobenzene

Isopropyl choride

Mustard gas is a

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Gas

High boiling speed

High melting liquid

Steam

The principle quantum number describes

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The distance form the nucleus

The shape of the orbital

The orientation of the orbital

The spin of the electron

Acid rain is caused when various atmospheric gases dissolve in rain water. What are the gases that cause rain water

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SO₂

NO₂

CO

A and b only

Which is the derived lipid?

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Common fats

Vitamin-D

Common oils

Spinolipids

The method in which alkanes prepared by alkyle halides in the presence of palladium - charcoal is

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Hydrolysis

Electrolysis

Hydrogenation

Hydrogenolysis

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