Question # 1

Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg toxic

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It attaches to sulphur of the disulphide link

Hg is a heavy metal

Hg is liquid at room temperature

Hg is reactive chemically

The lattice energy of NaCl is

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787 j/ mole

790 kj/mol

780 kJ/ mol

-787 kI / mole

Polymer formed by the combining of three different monomers is called:

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Homopolymer

Copolymer

Ter polymer

Thermoplastic polymers

Which compound is not formed as a result of reaction between acetic acid & HI & red phosphorous

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Ethanol

Water

lodine

Ethane

The nature of crystal of diamond is

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metallic

molecular

covalent

ionic

Equal volume of all gases at same temperature and pressure contain number of molecules

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different

multiples

equal

in fractions

Which is the example of diffusion of gases

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bubbling in soda bottle

vapour condensing on a moist surface

hot air rising above a candle

spreading of smell from a scent bottle

The boiling points of the halogens

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increases down the group

decreases down the group

remains constant

can not be predicted

Ozone gas has boiling point:

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Low

High

Medium

Highest

An example of ion-dipole force is the solution of:

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bromine inbenzene

ethanol is water

NaCl in water

glucose in water

Which of the following alcohol cannot be produced by treatment of aldehydes or ketones with NaBH4

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I-propanol

2-Methyl-2-propanol

2-propanol

Ethanol

When electricity is passed through molten electrolyte consisting of alumina and cryolite, 13.5 g of Al are deposited. The number of faradays of electricity passed must be

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2.0

1.5

1.0

0.5

The Zwitter ion is also called

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International salt

Internal salt

No salt

None of these

At certain temperature, 50% of HI is dissociated into H₂and I₂the equilibrium constant is

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1.0

3.0

0.5

0.25

Among the following polymers, the strongest molecular forces are present in

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Elastomers

Fibres

Thermoplactics

Thermosetting polymers

Reduction of aldehydes with HI and P gives

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Primary alcohols

Secondary alcohols

Alkanes

Tertiary alcohols

The covalent bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

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Diastase

Lipase

Inverters

Zymase

An alkynes having Carbon count of 20 is

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gas

liquid

Solid

None

In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled then the equilibrium constant will

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Also be doubled

Be halved

Becomes one fourth

Remains the same

A sequence of how many nucleotides in massenger RNA makes a codon for an amino acid

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Three

Four

One

Two

The most acidic of the following compounds is

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P₂O₃

Sb₂O₃

B₂O₃

As₂O₃

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