Question # 1

250cm of 0.2 molar potassium sulphate solution is mixed with 250cm of 0.2 molar KCI solution. The molar concentration of K ions is:

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0.2 molar

0.25 molar

0.3 molar

0.35 molar

Two substances that have the same crystal structure are said to be

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isomorphous

anisotropic

isotropic

polymorphous

Chloroform (CHCl3) is?

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Primary alkyl halide

Secondary alkyl halide

Tertiary alkyl halide

a liquid

Which of the following compound shows the geometrical isomerism

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2-butene

2-butyne

2-butanol

Butanol

Which of the following compound is least reactive

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HCHO

CH3CHO

CH3COCH3

C6H5CHO

A compound that has a nucleophilic carbon?

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C2H2

C2H4

C3H8

C6H6

In the presence of hot alkaline potassium permanganate solution 2-butene will give

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Formic acid +acetic acid

Two moles ethanoic acid

Two moles of methanoic acid

Ethylene glycol

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will:

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reduced to 1/4

be double

increases four times

remains unchanged

In aldehydes and ketones carbon of carbonyl group is;

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sp³ hyhridized

sp² hybridized

sp hybridized

un hybridized

The vapour density of a gas is 11.2.The volume occupied by 11.2 g of this gas at N.T.P is

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22.4 litres

11.2 litres

1 litre

2.24 litres

Tertiary alcohols are the easiest to dehydrate because

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They form stable carbocation

They have less hydrogen

They have bigger size

They are polar

The addition of HCI to ethene gives?

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Chloroethane

1,2-dichloroethane

1.1-dichloroethane

2-chloroethane

Which of the following contains maximum of number of molecules?

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100 cc of CO₂ at STP

150 cc of N₂at STP

50 cc of SO₂ at STP

200 cc of NH₃ at STP

Which of the following statement is correct if the intermolecular forces in liquids A,B and C are in the order A < B < C?

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B evaporates more readily than A

B evaporates less readily than C

A and B evaporates at the same rate

A evaporates more readily than C

A reaction A- B is independent of concentration of reactant A. The order of reaction will be

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First order

Second order

Third order

Zero order

At what temperature, would N₂molecules have the same average speed as He-molecules at 300 k?

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1100 K

2100 K

420 K

None

Which type of motion is exhibited by gases?

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Vibrational

Transitional

Rotational

All of them

Fe+2 is the co-factor for

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Chrome oxidase

Glucose-6-phosphatase

Carbonic anhydrase

Hydrolase

When graph is plot between P and 1/V at constant temperature. A straight line obtains which move toward ______ when temperature increase

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Pressure axis

Volume axis

1/V axis

1/P axis

For reaction of methane and chlorine light is not available then

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Reaction will take place rapidly

No Reaction take place

Reaction occurs at double the rate

May all cases occur

Which of the following is a non-crystalline solids pair

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Diamond, wood

Glass, table salt

Wood, glass

Sucrose, glass

The B.P. of compound is mostly raised by

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dipole-induced dipole interactions

london dispersion forces

intramolecular H-bonding

intermolecular H-bonding

The density of a gas is 1.964 g dm-³ at 273K and 76 cm Hg The gas is

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CH₄

CO₂

C₂H₄

Xe

H2O and HF are the hydrides of the second period. Fluorine is more electronegative than oxygen. Anyhow, the boiling point of water is greater than that of HF. This is due to:

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water is more polar than HF

water has a bent structure

HF has a zig zag structure after making hydrogen bonding

the number of hydrogen bonds produced by water are greater than that of HF

The gas which obeys the gas laws at all conditions of temperature and pressure is

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ideal gas

perfect gas

real gas

noble gas

Total heat content of a system is called

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Internal energy

Entropy

Enthalpy

All of these

According to the general gas equation, density of an ideal gas depends upon

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Pressure

Temperature

Molar mass of the gas

All of the above

The smallest unit of a crystal that shows all the characteristic properties of its pattern is called

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cell

electrolyte

unit cell

crystal

The values of ∆H for the process l(g)+e-1--------->
I-1(g) is:

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>0

<0

0

None

pi-bond can be formed by sideways overlap of

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s-orbital

d-orbital

p-orbital

sp orbital

The rate of diffusion of a gas is proportional to

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P /√d

√p/d

P/d

√ P/d

Most of the reactions which give stable products are

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Endothermic

Exothermic

Isothermal

Non of these

Which of the following molecule has zero dipole moment?

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PCI3

BF3

NH3

H2O

Evaporation causes

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High temperature

High pressure

Cooling

Vapour

The oxidation state of transition elements is usually

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Variable

Single

Constant

Infinite

which of the following is a typical transition metal?

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Sc

Y

Ra

Co

Correct order for the reactivity ofalkyl halide in S, reactions

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R-I>R-F>R-CI

R-F>R-CI>R-I

R-I>R-CI>R-F

R-CI>R-I>R-F

What is the reason of ionic solids for not conducting electricity?

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free electrons are less

ions don't have translatory mention.

ions don't have translatory mention

the coordination number of the ion is very high.

The vapour pressure of a liquid depends upon

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amount of the liquid

surface area

temperature

size of container

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

What can be deduce about two gases which have the same molecular mass:

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They have same numbers of atoms in a molecule

They have same rate of diffusion

They have same boiling points

They have equal solubility in water at room temprature

The mass of 8.5 dm³of oxygen gas at 0.0821 atm and -1°C is

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100 g

10 g

1 g

0.1 g

The boiling point of radon (211k)id higher than boiling point of helium (4.4k). This is due to the reason that:

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the atomic mass Rn is larger than that of He

the dispersion forces between Rn atoms are more prominent than between he atoms

rn atomic number of Rn is larger than that of He

The order of reaction provides valuable information about of reaction

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Condition

Concentration

Mechanism

Parameters

Observed pressure of gas on the walls of container is less than actual pressure due to

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Hephazard motion

Inter molecular attractive forces

Elastic collision

Repulsive forces

Which one of the following is not true relationship

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The rate of reaction for a reaction is 30 mol dm-3sec-1 if the product of concentration of 10.reactant is unity the specific rate constant is

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25

2.5

30

15

Kinetic energy of one mole of an ideal gas at 300 K in kJ is

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34.8

3.48

3.74

348

The boiling point of H2O is 100°C while that of C2H5-OH is 78.5C°. The reason is that:

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H2O molecules are small-sized

the bond angles at oxygen atom are different

C2H5-group is electron donating

the number of H-bonds are greater in H20, than C2H5-OH

Mostly ionic compounds are produced between elements of group

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IA and IIA

IB and VIB

IA. IIA and VII-A

IA and IB

All are examples of different classes of enzymes except

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Hydrolases

Isomerases

Oxido-reductases

Mutases

Compared with alkaline earth metals, the alkali metals exhibit.

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lower ionization energies

greater hardness

high boiling point

smaller ionic radii

At constant pressure, if the original volume is 546 cm³at which temperature the volume of gas 552 cm³

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1°C

2°C

3°C

4°C

An example of ion-dipole force is solution of

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NaCl in water

Glucose in water

Bromine in benzene

Ethanol in water

Which alkaline earth metal makes peroxide?

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Ba

Be

Mg

Ca

How many grams of NaOH are present in 250 cm3 of its 0.2M solution

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,4 g

, 0.4 g

, 10 g

, 2 g

.Both aldehydes and ketones are planar to the neighborhoods of carbonyl (C-0) group. Which one of the following bonds is distorted towards the oxygen atoms?

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pi-bond of C and O

Sigma bond of C and O

Sigma bond of C and H

Sigma bond of C and C

Mg(s) + 2HCI(aq). ------------ MgCl2(aq)+ H2(g)

Given that; Mg=21g and HCI=21g, the excess reactant is

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Mg

HCI

Both are in stoichiometric amounts

None of these

At ordinary temperature, the most nearly ideal gases are

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N₂

He

H₂

all these

The oxidation state of carbon in C2O-²4 is

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+4

-4

+3

+2

Mass spectrometry is used to determine the

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Number of isotopes of an element

Relative abundance of isotopes

Relative isotopic masses

All of these