Question # 1

The Complete oxidation of ethanol produces first Ethanal than

Choose an answer

Ethanal

Propanone

Ethanoic acid

Benzoic acid

Esters have fruity smell and are used as artificial favours. Amyl acetate gives flavour of

Choose an answer

Banana

Jasmine

Pineapple

Orange

pH of an aqueous solution is 3.0 at 25°C. The hydrogen ion concentration in the solution would be

Choose an answer

0.001

0.01

0.0001

10(-5)

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

Choose an answer

Low temperature and high pressure

Low temperature and low pressure

High temperature and low pressure

High temperature and high pressure

Based on the physico-chemical properties, proteins may be classified into the following types

Choose an answer

Simple proteins

Compound proteins

Derived proteins

All of the above

The crystals formed due to London forces of interaction are

Choose an answer

ionic

covalent

molecular

metallic

In solid, the temperature is the measure of:

Choose an answer

Rotational kinetic energies.

Translational kinetic energies.

Vibrational kinetic energies.

None of above.

During oxidation process, oxidation number of an element

Choose an answer

Decreases

Increases

Remains constant

Both a and b

The molarity of 2% W/V NaOH solution is

Choose an answer

2

0.25

0.05

0.5

A substances has M_r74.5, a melting point of 772°C and a boiling point of 1407°C. It conducts electricity only when in the liquid state.What is the bonding present in this substances?

Choose an answer

covalent

ionic

metallic

hydrogen bonding

Enthalpy of neutralization (∆H°n) per mole of H2SO4/ Ba(OH)2 is

Choose an answer

+57.4 kJmol-1

-114.8 kJmol-1

-57.4 kJmol-1

For gases obeying Boyle's law, if pressure is quadrupled, the volume becomes

Choose an answer

Double

One half

One fourth

Remains constant

The crystal system which has all cell angles equal, but not 90°and less than 120° , the system is

Choose an answer

orthorhombic

monoclinic

hexagonal

rhombohedral

Which statement is incorrect

Choose an answer

pH and [OH-] are inversely related to cach other

pOH and [OH-] are inversely related to each other

pH and [OH-] are directly related to each other

pOH means potential of hydroxyl ion concentration

The rate diffusion of H₂is 4 times than the of an unknown gas at same temperature and pressure, the molecular mass of unknown gas is

Choose an answer

32

16

4

64

What s the boling point of H2O at the peak of Mount Everest?

Choose an answer

101 C°

69°C

100 C°

98° C

Which of the following has isomorphous structure with MgO

Choose an answer

NaF

S

Sn

N

Instantaneous dipole-induced dipole forces are also known as:

Choose an answer

dipole-dipole interactions

hydrogen bonds

covlent bonds

Van der Waals forces

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

Choose an answer

Hydrolysis

Oxidation

Reduction

Redox

Which is most acidic?

Choose an answer

H2O

C2H5OH

C4H9OH

CH3-CH2-CH2OH

According to the kinetic theory of gases,in an ideal gas,between two successive collisions a gas molecule travels

Choose an answer

Ina circular path

In a wavy path

In a straight line path

With an accelerated velocity

At constant temperature, volume of given mass of gas in inversely proportional to pressure on it. This statement is according to:

Choose an answer

Hook's law

Graham's law

Bolye's law

Charle's law

The ionization energy

Choose an answer

generally increases from left to right in a period

increases from top to bottom in a group

does not change in a period

does not change in a group

Propanone does not undergo

Choose an answer

Oxime formation

Reduction of Fehling solution

Hydrazone formation with hydrazine

Reaction with HCN

As the number of carbon atoms increases the number of isomers also increase. The 5 C compound pentane has as many as

Choose an answer

3 isomers

5 isomers

6 isomers

10 isomers

Gas is enclosed in a container of 20cm3 with the moving piston. According to kinetic theory of gases, what is the effect on freely moving molecules of the gas if temperature is increased from 20°C to 100C.

Choose an answer

Colliding capability of molecule will become lower

Pressure will become one half

Temperature has no effect on freely moving molecules

Volume will be increased

Critical temperature of argon's gas is low. the reason is that

Choose an answer

it contains four lone pairs

it is mono atomic gas

it has as smell signed

its polarizability is low

Which one of the followings is resistant to oxidation under normal conditions

Choose an answer

Methyl alcohol

Acetaldehyde

Ethyl alcohol

Acetone

what is it difficult to cook food at high as compared to at sea level? Choose the correct reason.

Choose an answer

H-bonding in H₂O changes with height

temperature at the top of mountain is low

density of water decreases at the mountain

boiling point of water decreases at the mountain

Which of the following is not heterocyclic compound?

Choose an answer

Naphthalene

Furan

Pyridine

Pyrrole

The study of which one of the followings guides to the mechanism of the reaction

Choose an answer

Order of reaction

Rate of reaction

Half-life period of reaction

Rate determining step

In an elimination reaction a more substituted alkene is formed due to the stability associated with

Choose an answer

Free radical

transition state

Activated complex

Carbocation

Fe+2 is the co-factor for

Choose an answer

Chrome oxidase

Glucose-6-phosphatase

Carbonic anhydrase

Hydrolase

Elimination unimolecular reactions involve

Choose an answer

Second order kinetics

First order kinetics

Third order kinetics

Zero order kinetics

Proteins loose their ability to work

Choose an answer

by slight heating

by change in structure

by slight cooling

when inside the body

The maximum possible number of hydrogen bonds in which a H₂O molecule can participate is

Choose an answer

1

2

3

4

Esterification of CH3COOH isreaction

Choose an answer

Acid base

Electrophilic

Redox

Nucleophilic

Vapour pressure of a liquid is more if

Choose an answer

the intermolecular forces between the molecules of the liquid are strong

the intermolecular forces between the molecules of the liquid are weak

more liquid is present in a container

liquid has more surface area to evaporate

The highest melting point is observed by

Choose an answer

Butanoic acid

Propanoic acid

Pentanoie acid

HCI

Dipole-dipole forces are present between:

Choose an answer

non-polar molecules

polar molecules

both polar and non-polar

none pf above

Which of the following reagents reaet in same manner with HCHO, CH3CHO andCH3COCH3

Choose an answer

HCN

Cu2(OH)2/ NaOH

Ammonical AgNO3

Cu(OH)2 only

Enzymes are

Choose an answer

simple proteins

derived proteins

compound proteins

conjugated proteins

If the volume of 2 moles of an ideal gas at 540 K is 44.8 litre then its pressure will be

Choose an answer

1 atmosphere

2 atmosphere

3 atmosphere

4 atmosphere

The process of effusion is best understood by law

Choose an answer

Grahams

Boyle s

Charles s

Avogadro s

NH₃gas is liquefied more easily than N₂Hence

Choose an answer

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)

How should the conditions be changed to prevent the volume of a given gas from expanding when its mass increased?

Choose an answer

temperature and pressure both ara increased

temperature and pressure both are lowered

temperature is lowered and pressure is increased

temperature is increased and pressure is descreased

R = 0.08205:

Choose an answer

atm dm³mol^-1k^-1

J mole^-1k^-1

Nm mol^-1k^-1

cal. mol^-1k^-1

The boiling point of higher alkanes are greater than those of lower alkanes due to reason that

Choose an answer

higher alkanes have greater number of atoms

the polarizabilities of higher alkanes are greater

higher alkanes have greater hydrogen bonding

higher alkanes have zig-zag structures

Naphthalene has two fused aromatic ring of carbon atom the molecular formula

Choose an answer

C10H8

C10H14

C10H10

C12H12

One statement of isomorphism is incorrect

Choose an answer

they have different chemical properties

they have same physical properties

they have same atomic ratio

they have definite geometric shape

Which compound gives carbon when heated with conc. H2SO4.

Choose an answer

Starch

Ethyl alcohol

Oxalic acid

Formic acid

The intramolecular forces in gases are:

Choose an answer

Weak.

Normal.

Very weak.

Strong.

Which of the following salts would give the same products irrespective of whether its molten form or concentrated aqueous solution is electrolysed?

Choose an answer

Magnesium bromide

Magnesium sulphate

Copper sulphate

Copper chloride

When vapour pressure is equal to atmospheric pressure than it is called

Choose an answer

Evaporation

M.P

B.P

Freezing point

The pH of neutral water is 6.8 then the temperature of H2O is

Choose an answer

25°C

More than 25°C

less than 25 C°

Not predicted

Which of the following liquid has higher boiling point?

Choose an answer

HCl

HBr

H₂O

Br₂

Whenever a reaction is endothermic, then it means that

Choose an answer

Heat is transferred system to the surrounding

Heat is transferred from surrounding to the system

Heat content of the products is less than that of reactants

Heat content of the reactants is greater than the products

Formalin contains-------% alcohol.

Choose an answer

37

80

8

52

For a chemical reaction in which one of the reactant also act as solvent, the order will be

Choose an answer

First order

Third order

Second order

pseudo-first order

Which of the following may be called London dispersion forces

Choose an answer

dipole-dipole forces

ion-dipole forces

dipole-induced dipole forces

instantaneous dipole-induced dipole forces

If volume of an ideal gas at 0C° 536cm3, what is volume at 1°C

Choose an answer

373 cm3

646 cm3

Becomes 0cm3

746 cm3