Question # 1

^{The common oxidation number of halogens is}

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-1

+1

-2

0

Which is trigonal cyrstal

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BaSO₄. 4H₂O

FeSO₄

NaNO₃

None

The volume of a real gas

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is constant

increases with T decrease

becomes zero at absolute zero

never becomes zero

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

A real gas obeying van der Waals equation will resemble ideal gas if

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Both a and b are large

a is large and b is small

Both a and b are small

a is small and b is large

The kinetic energy of three moles of gas is:

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3/2 RT

3 RT

1/2 RT

2 RT

Which of the following gases have maximum root mean square velocity at 25°C:

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SO₂

NH₃

CO₂

H₂S

What will be the pH of 1.0 mol dm-3 of NH4OH, which is 1% dissociated

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2

12

0

2.7

If the reaction "P+Q→R+S' is deseribed as being of zero order with respect to P, it means that

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P is catalyst in this reaction

P molecules do not possess sufficient energy to react

The concentration of P does not change during the reaction

The rate of reaction is independent of the concentration of P

Which forms metallic cyrstals

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Cu

NaCl

Diamond

None

The crystal of diamond is

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ionic

molecular

covalent

metallic

For N2: +3H2<--------> 2NH3, if Kc is 1 than value of Kp at 273K would be

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1/22.414

1/(22.414)2

22.414

11.207

A real gas obeying Vander Waal's equation will resemble ideal gas if

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Both a and b are large

Both a and b are small

a is small and b is large

a is large and b is small

Decomposition of H2O is

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Endothermic reaction

Nuclear reaction

Exothermic reaction

Zero nuclear reaction

Steam causes more seers burns than boiling water. It is due to

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Latent heat of fusion

Latent heat of vaporization

Latent heat of sublimation

All of above

Which one of the following elements is the strongest reducing agent?

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Chlorine

Sodium

Magnesium

Aluminium

Methyl cyanide, on boiling with mineral acids yield

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Acetic acid

Formic acid

Propanoie acid

Butanoic acid

In the formation of NaCl crystals from its aqueous solution, its cubic shape is changed to needle like when 10% urea is present as impurity, this phenomenon is called as

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habit of crystal

polymorphism

anisotropy

cleavage

Which of the following does not give yellow precipitate with I2+ NaOH

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Acetone

Benzaldehyde

Acetildehyde

Acetophenone

If the volume term is present in denominator of Kc expression, then which one is correct

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Increase in pressure will shift the reaction backward

Increase in pressure will shift the reaction forward direction

Decrease in volume will shift the reaction forward direction

Reaction will not effected

The oxidation state of transition elements is usually

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Variable

Single

Constant

Infinite

Electrolytic products of dilute aqueous solution of sodium sulphate is

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Na. SO2

H2. S02

Na. O2

H2,O2

Which of the following metal cannot evolve hydrogen from the acetic acid

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Sodium

Potassium

Magnesium

Copper

The bond angle between any two sp hybrid orbitals is A.109.28°

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107.09°

120°

90°

80°

London forces are more affective at:

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high temperature

low temperature

low pressure

high pressure

NaCI has face centered cubic structure. The Na ion at the face of the unit cell is shared by

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2-unit cells

4-units cells

only one unit cell

8-unit cells

Amount of product formed increases with time, this statement is true for reactions-------with kinetics

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1s order

3rd order

zero order

Any order

Which one increases by common ion effect except?

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Crystallization

Solubility

Association of ions

All of these

Which one of the following is not an alicyclic compound?

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Cyclohexene

Cyclohexane

Benzene

Cyclopentane

The transition temperature of tin is

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95.5 C°

13.2 C°

13.2°C

128.5°

In a closed vessel a gas is heated from 300 K to 600K The kinetic energy becomes remains

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Double

Same

Half

Four times

The value of R is SI units is

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0.0821 dm³. atm. J^-1mole^-1

62.4 dm³torr K^-1mole^-1

8.31 dm³atm. K^-1mole^-1

8.31 JK^-1mole^-1

The pressure of 5dm³gas increase from 250 torr to 500 torr then new volume of gas

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500 cm³

375 cm³

2500 cm³

None of these

If the pressure of gas reduced to one half and temperature is increased twice then density of gas will be

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4 times

2 times

1/2 times

1/4 times

In which of the following molecules, strongest H-bond is shown?

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hydrogen fluoride

water

hydrogen sulphide

ammonia

Which of the statement is applicable for both ideal and real gases molecules?

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Have no forces of attraction

Collisions between the molecules is elastic

Molecules are in random movement

The actual volume of gas is negligible as compared to the volume of gas

Final product of hydrolysis of nitrile is

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Ketone

Alcohol

Aldehyde

Carboxylic acid

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

If the concentration of salt is greater than the acid in buffer solution, then the

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pH = pKa

pH = pKb

pH > pKa

pH < pKb

The decomposition of N2O4 to NO2 is carried out at 280°C in chloroform. When quilibrium is reached. 0.2 moles of N2O4 and 0.02 mole of NO2 are present in 1:1 ratio The equilibrium constant for the reaction N2O4------> 2NO2 is

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0.01

0.001

0.02

0.002

In Boyle's law which of the following pair remains constant:

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Temperature and quality of a gas.

Pressure and quality of a gas.

Temperature and pressure.

Temperature and quantity of a gas.

The number of molecules in 22.4 dm3 of gas at 0°C and 1 atm are

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6.02×10(23)

6.02× 10(25)

6.02×10(22)

6.02×10(21)

Water has high boiling point which is due to:

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high electric constant

weak dissociation

high specific heat

H-bonding between its molecules

Haemoglobin molecule is how many times heavier than helium atom

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68000 times

17000 times

,34000 times

, 1700 times

The elements of group I-A react violently with water and make the solution

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neutral

amphoteric

acidic

alkaline

Which of the following statements is false?

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Avogadro number = 6.02 x 10²¹

The relationship between average velocity (v) and root mean square velocity (u) is v = 0.9213 u

The mean kinetic energy of an ideal gas is independent of the pressure of the gas

The root mean square velocity of the gas can be calculated by the formula (3RT/M)^1/2

The reaction which is responsible for the production of electricity in the voltaic cell is

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Hydrolysis

Oxidation

Reduction

Redox

If the temperature is inereased of following reaction, then will go in N2 +3H2 <---------> .2NH3, ∆H= -Ve

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Forward direction

Reverse direction

Remain constant

Cannot be predicted

Which of the following is not heterocyclic compound?

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Naphthalene

Furan

Pyridine

Pyrrole

According to Avogadros law 1 mole of gas at S.T.P has a volume of

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22.4 dm³

24 dm³

24000 cm³

2m³

Which of the following is a limitation of balanced chemical equation

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Conditions and rate of reactions

Physical state and mechanism

Reactants and products and their coefficients

Both (a) and (b)

The energy difference of d-orbitals varies from

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Atom to atom

lon to ion

Electron to electron

proton to proton

Van der Waals equation explains the behaviour of

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Real gases

Mixture of gases

Ideal gas

Diatomic gases

Which of the following bond is responsible for joining the amino acids in proteins?

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Metallic Bond

Di sulfide bond

Peptide Bond

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

The relationship which describes the variation of vapour pressure with temperature is called

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Hess's law

Arrhenius equation

Kirchhoff's law

Clausius-Clapeyron equation

For a gas the isotherm is the graph between

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V and T

T and P

n and T

P and V

Which one of the following is an aromatic compound?

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Benzene

Thiophene

Furan

All of them

The sole produets of combustion analysis are

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CO2 and NH3

H2O and Mg(CIO4)2

CO2 and KOH

CO2 and H2O

In a cubic lattice a unit cell is shard equally by how many unit cells?

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4

2

6

8

Amorphous solids

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have sharp melting points

undergo clean cleavage when cut with knife

have perfect arrangement of atoms

can possesses small regions of orderly arrangements of atoms