Question # 1

Amorphous substance show

(i) Short and long range order

(ii) Short range order

(iii) Long range order

(iv) Have no sharp melting point

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(i) and (ii) are correct

(ii) and (iv) are correct

(ii) (iii) and (iv) are correct

(i) and (iv) are correct

When the temperature is raised, the viscosity of the liquid decreases.This is because of

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Decreased volume of the solution

Increase in temperature increases the average kinetic energy of molecules which overcome the attractive force between them

Decreased covalent and hydrogen bond forces

Increased attraction between the moelcules

Low IE is a symbol of

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high electronegativity

small size

High electron affinity

Metallic character

A polymeric substance that is formed in the liquid state and then hardened to a rigid solid is called:

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fiber

plastic

varnish

polyamide resin

Pressure of 1Nm^-2 is equal to

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One bar

1 psi

One pascal

One atmosphere

The rate of reaction between A and B increases by a factor of 100, when the concentration of A is increased 10 folds, the order of reaction with respect to A is

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10

1

4

2

Which of the following reactions are usually slow?

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Neutralization of acids and bases

Displacement Reactions

Organic substitution reaction

Free radical reactions

In the reaction A2 (g) + 4B2 (g) <-----------> 2AB4 (g) such that ∆H < 0, the formation of AB4(g) will be favoured at

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Low temperature and high pressure

Low temperature and low pressure

High temperature and low pressure

High temperature and high pressure

The phenomenon in which sudden expansion of a gas causes cooling is called

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evaporation

cooling

Joule Thomson effect

sublimation

Lithium differs from rest of members of its group due to which of following reasons

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High E.N of Li+1

Small radius

High charge density

All above are correct

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

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AI

Hg

As

Cr(vi)

Pure water does not conduct electricity because it

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Has low boiling point

Is almost unionized

Is neutral

Is readily decomposed

Which is liquid among the following alkenes?

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Ethane

Propene

Butene

Pentene

Shape of CIO₃is

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Triangular pyramidal

Tetrahedral

Triangular planar

Triangular bipyramidal

The conversion of chemical energy into electrical energy requires :

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Electrolytic cell

Galvanic cell

Voltaic cell

Both (b) and (c)

The method used only for the production of symmetrical alkanes

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Kolb's method

Clemmenen

Cannizzaro

Wolf kishner

Gypsum added in the cement is :

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5%

10%

15%

20%

Which functional group is present in glycerol tristearate

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Carboxylic acid

Alcohol

Aldehyde

Ester

The amount of products obtained from the balanced chemical equation is regarded as

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Theoretical yield

Actual yield

% yield

Experimental yield

Which statement is not correct

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Enzymes catalyst a specific reaction

Enzymes show catalytic activity at a specific temperature

The catalytic activity of enzymes is stopped if optimum pH is changed

The catalytic activity is poisoned by a co-enzymes

The rate of reaction determined at a given time is called

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Average rate

Instantaneous rate

Specific rate

Overall rate

Which of all following compound is not possible

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