Question # 1

The polymers which can not be re-softened again and again are called

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Thermoplastic

Thermosetting

Both a and b

None

Separation of low molecular weight protein from high one is

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Dialysis

Cromotography

Electrophoiesis

Ultracentrifugation

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

The incineration may reduce volume of wastes upto:

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1/4th

1/2nd

2/3rd

3/4th

In many countries plastic waste is collected separetaly and sorted.Some of this is incinerated to provide heat for power stations.
Why is pvc polyvinylchloride,removed from any waste that is to be incinerated?

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It can be melted down and re-used

its combustion products are harmful

it destroys the ozone layer

it does not burn easily

At equilibrium rate of evaporation and rate of condensation

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Become very high

Become very low

Become equal

Can never be equal

NH₃gas is liquefied more easily than N₂Hence

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Van der Waals constants a and b of NH₃> that of N₂

Van der Waals constants a and b of NH₃< that of N₂

a(NH₃) > a (N₂) but b (NH₃) < b(N₂)

a (NH₃) < a (N₂) but b (NH₃) > b (N₂)

Global warming is mainly caused by ______ radiations

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UV

I.R

gama

X-rays

What are the conditions under which the relation between volume (V) and number of moles (n) of gas is plotted? (Pressure; T-temperature)

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constant P and T

constant P and V

constant T and V

constant n and v

Which of the following metal does not liberate hydrogen on reaction with acid?

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Mg

Pt

Zn

Ca

Which thermometer will have its reading 273 degrees greater than that of thermometer C?

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A

B

B has 273 degrees greater than A

C has greater reading than all other thermometers

Which of the following is non-typical transition element?

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Cr

Mn

Zn

Fe

A carboxylic acid with one caboxyl group:

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Monocarboxylic acid

Dicarboxylic acid

Tricarboxylic acid

Polycarboxylic acid

It rate law of an equation is written asdx/dt=K[A][B] ?

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Reaction is independent of the concentration of A and B.

Product is decreasing with passage of time.

Reactant in increasing with passage of time.

Reactant is increasing with passage of time.

When hydrogen cyanide is added to an Aldehyde in the presence of ammonia it is called

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Strecker synthesis

Cory house synthesis

Williamson;s synthesis

None of these

The total number of possible values of magnetic quantum number for the value of l=3 is

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3

1

5

7

Which three elements are needed for the healthy growth of plants?

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N,S,P

N,Ca, P

N,P,K

N,K,C

Elimination bimolecular reactions usually obey

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First order kinetics

Second order kinetics

Third order kinetics

Zero order kinetics

To determine the rate of reaction chemically a graphical method is applied. A graph is plotted between the amount or reactant decomposed or product formed against the time. The rate d_x/d_tat any time is equal to

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k

Tangentθ

1/a, a is initial conc.

1/a²

Phosphide ion has the electronic structure similar to that of

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Nitride ion

Fluoride ion

Sodium ion

Chloride ion

The relative abundance of Pb isotopes is 1.5% Pb²⁰⁴, 23.6% Pb²⁰⁶, 22.6% Pb²⁰⁷, 52.3% Pb²⁰⁸The relative atomic mass of Pb is

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207.94

208.24

206.94

207.24

Phenols are derivative of:

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Alkanes

Alkenes

Alkynes

Benzene

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