Question # 1

Elevated concentration of ______________ is harmful for fish as it clog the gills causing suffocation

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AI

Hg

As

Cr(vi)

Ozone is usually produced in the

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South polar region

North pole region

Tropical region

Thermosphere zone

When liquid solute is dissolved in liquid solvent, then the best unit of concentration is?

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% W/W

% W/V

% V/V

%V/W

Correct statement about Nucleophilic substitution bimolecular is

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Transition state is formed

Inversion take place

It is two step reacticn

Both a &c

NO and NO₂gases in atmosphere are represented by

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NO

NO₄

NO_x

N_xO_y

Which of these is a synthetic polymer

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Polypeptide

Cellulose

Polyester

Starch

Which of the following is addition polymerization

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PVA

Polystyrene

Both

None

At constant volume, for a fixed number of moles of a gas the pressure of the gas increases with size of temperature due to

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increase in average molecular speed

increase in number of moles

increase in molecular attraction

decrease in the distance between the molecules

In which of the following types of reactions are the carbonyl compounds and alkene are similar in behaviour

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Nucleophilic addition

Electrophilic addition

Nucleophilic suhstitution

Catalytic hydrogenation

If internal energy of the system is increased

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Change in state of the system may occur

Temperature of the system may rise

Chemical reaction may take place

All of these

The compound that has zero dipole moment is

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HCl

H₂S

NH₃

CH₄

Of the given alkali metals, the one with smallest size is

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Rb

Cs

K

Na

Which of the following hydrides has the lowest boiling point?

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H₂O

H₂S

H₂S3

H₂Te

Oxidation of ter-alcohol gives:

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Aldehyde

Formaldehyde

Ketone

Alkens

The characteristic reactions of alkanes are

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Addition reactions

Substitution reactions

Condensation reactions

Polymerization reactions

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8 g

16 g

32 g

24 g

Aldelydes are the oxidation product of

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P-alcohols

s-alcohols

ter-alcohols

carboxylic acids

Free radical mechanism of halogenation of alkanes follow step:

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Initiation

Propagation

Termination

All of these

The M.P. of carboxylic acids containing even number of carbon atoms is ______ than the next

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Higher

Low

Equal

None

Balmer's series is in ______ region

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Visible

U V

I. R.

None

Addition of solid NaHCO₃in water causes ionization of NaCHO₃its K_a= 4.7 x 10^-1. Then this solution has character

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Acidic

Very weakly basic

Alkaline

Neutral

17.1 grams sucrose (C₁₂H₂₂O₁₁) dissolved in 250 cm³of solution. This has molarity

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0.1 M

0.2 M

0.01 M

0.02 M

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