Question # 1

Buffer action can be explained by except

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Common ion effect

Le-Chatelier's principle

Law of mass action

Solubility product

When equal proportion of DH3_ l and C2H5 ___ l are treated with Na metal in preasence4 of dry ether, the number of possible hydrocarbons obtained will be:

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5

4

3

2

Which of the following polymer has application in paper industry

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Starch

Glycogen

Protein

All

The trade name of polytereafluoroethylene (PTFE) is

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Teflon

PVC

terelene

polyester

Water is made disinfectant during purification of water to the step:

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aeration

coagulation

chlorination

treatment

Amount of fresh water used by agriculture is

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2%

23%

69%

97%

Energy of atom in compound is

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Higher than individual atom

Lower than individual atom

equal to individual atom

Impossible to predict

The most suitable temperature for preparing ammonia gas is

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250℃

450℃

350℃

550℃

Which one of following statement about three about three states of matter is incorrect?

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in solids the particles vibrate about fixed positions

energy is released when a gas turns back to a liquid

particles in gases move in a random manner

the closer particles are together, smaller the force of attraction between them

Activity of the enzyme is reduced by

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temperature

concentration

pH

inhibitors

Which heavy metals do not have any safe limits

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As

Hg

Cr

All of these

The simplest separating unit of a polymer is called:

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Monomer

Dimer

Trimmer

Macromer

Which compound is more soluble in water

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C₂H₅OH

C₆H₅OH

CH₃OCH₃

n-hexanol

Alcohol can be prepared from Grignard's reagent with an aldehyde: If we start with formaldehyde the product alcohol with be

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Primary

Secondary

Territory

Aromatic

The detection of functional group is called:

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Numerical analysis

Qualitative analysis

Quantitative analysis

Combustion analysis

Sulphuric acid generates nitronium ion by reacting with

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Nitric acid

Nitrogen gas

Nitrous acid

Potassium nitrate

I-Chloropropane has two isomers, it is an example of

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Chain isomerism

Position isomerism

Functional group isomerism

Metamerism

Which is used to remove air bubbles form metals?

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B

Be

Mg

Al

It is common observation that rates of chemical reactions differ :

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Greatly.

A little bit.

Moderately.

For which system does the equilibrium constant, KC has units of concentration

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Which of the following does not reflect the periodicity of elements?

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Bonding behaviour

Electronegativity

Ionisation potential

Neutral/proton ratio

The chemical method used for determination of rate of reaction is

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Spectroscopic

Conductiometric

Refractometric

Titration

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