Question # 1

The movement of gas molecules from a region of high pressure to vacuum is called:

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Evaporation

Effusion

Conduction

Diffusion

The energy produced by a carbohydrate is:

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3 kcal/gm

2kcal/gm

6kcal/gm

4kcal/gm

Choose an addition polymer among the following

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Terylone

Nylon 6, 6

Polystyrene

Epoxy resin

Vapour pressure of a substance does not depend upon:

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physical state of matter

temperature

intermolecular forces

surface area

Butyric acid was named from butyrum means:

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Red out

Vinegar

Butter

Milk

what is it difficult to cook food at high as compared to at sea level? Choose the correct reason.

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H-bonding in H₂O changes with height

temperature at the top of mountain is low

density of water decreases at the mountain

boiling point of water decreases at the mountain

Which of the following is NOT thermoplastic

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PVC pipes

Plastic toys

Varnish

Both A and B

The unit of pressure ______ is commonly used by meteorologists

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mm of Hg

Kilopascal

Millibar

Pound per square inch

H2O and HF are the hydrides of the second period. Fluorine is more electronegative than oxygen. Anyhow, the boiling point of water is greater than that of HF. This is due to:

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water is more polar than HF

water has a bent structure

HF has a zig zag structure after making hydrogen bonding

the number of hydrogen bonds produced by water are greater than that of HF

Amino acids react together to form the primary structure of proteins which is accompanied by

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addition of water

addition of ammonia

removal of ammonia

removal of water

The gases 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 from the atmosphere

To help to clean the atmosphere

To help in fixing of bacteria

Which of the following has magnesium?

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Carbonic anhydrase

Haemocyanin

chlorophyll

Vitamin B₁₂

Alkene general formula :

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C_nH_2n+2

C_nH_2n

C_nH_2n-2

C_nH_2n+1

Each molecule of haemoglobin is 68000 times heavier than one atom of

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C

H

N

O

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

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Cathode rays are material particles

Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place

Cathode rays are absorbed by the nucleus

Cathode rays become heated

Electronegativity values of the elements F, CI and Br vary

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F > CI > Br

Br > CI > F

Cl > Br > F

CI > F > Br

A limiting reactant is one which according to the stoichiometric equation

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Has excess mass

Has least mass

Has excess number of moles

Has least number of moles

To get DDT, chlorobenzene has to react with one of the following compound in the presence of conc.H₂SO₄

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Trichloroethane

Dichloroacetone

Dichloroacetaldehyde

Trichloroacetealdehyde

Electrochemistry is concerned with the conversion of electrical energy into chemical energy in :

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Galvanic cell

Electrolytic cell

Voltaic cell

Both (a) and (c)

For what value ofK_{c almost forward reaction is complete :}

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K_{c =}10³⁰

K_{c =}10^-30

K_{c =}0

K_{c =}1

Solubility of a substance in water decreases with rise in temperature except

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CaCI₂. 6H₂O

Pb(NO₃)₂

K₂Cr₂O₇

Ce₂(SO₄)₃

Potable water is considered to be

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Safe for human consumption

Not safe for human consumption

The surface water

The ground water

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