Question # 1

Water may boil at 120 °C when external pressure is:

Choose an answer

100 mm of Hg

700 mm of Hg

760 mm of Hg

1489 mm of Hg

Only those metals can replace Hydrogen from dilute acids, which have

Choose an answer

High negative reduction potential

Low negative reduction potential

High positive reduction potential

low positive reduction potential

In esterification, the OH of carboxylic acid is replaced by

Choose an answer

OR+

R+

OR

R

Diamond and graphite are

Choose an answer

isomorphous

polymorphous

allotropes

none of these

H₂effuses through a porous pot at a rate of 500 cm³per minute at 0°C.The rate of diffusion of O₂through the same vessel at 0°C per minute is

Choose an answer

500 cm³

250 cm³

1 dm³

125 cm³

NH³ shows a maximum boiling point among the hydrides of V-A group elements due to :

Choose an answer

very small size of nitrogen

lone pair of electrons present on nitrogen

enhanced electronegative character of nitrogen

pyramidal structure of NH³

Which compounds is alicyclic in nature?

Choose an answer

Cyclobutane

Iso-bstand

n-Butane

Toluend

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

Choose an answer

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

If a salt bridge is removed from two half cells the emf is

Choose an answer

Increased

Decreased

Dropped to zero

Electrodes will be reversed

Phosphoprotein comes under the type of proteins

Choose an answer

Simple protein

Derived protein

Conjugated

Both A & B

SHE acts as anode when connected with Cu electrode but act as cathode with Zn electrode

Choose an answer

Zn has less reduction potential than hydrogen and Cu

Zn has high reductionl potential than hydrogen

and Cu

Zn is below electrochemical series than hydrogen and Cu

Zn has least tendency to lose electron

Which is not present as heteroatom in heteroeyclie compounds?

Choose an answer

Sulphur

Nitrogen

Oxygen

Chlorine

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

By increasing temperature,the transition from a gas to an ionized gas gives free electrons called:

Choose an answer

UV radiation

gas phase

plasma

vapour density

Glucose and fructose are isomers

Choose an answer

Chain isomers

Position isomers

Functional group isomers

Metamers

The temperature below which a gas does not exist is called its

Choose an answer

Inversion temperature

Critical temperature

Neutral temperature

Curie point

The density of methane at 2.0 atmosphere pressure at 27°C is

Choose an answer

0.13 gL^-1

0.26 gL^-1

1.30 gL^-1

26.0 gL^-1

Which of the following tests helps to distinguish between alkyne and alkene?

Choose an answer

Lucas test

Tollen's reagent test

Baeyer's test

Fehling's solution test

The destiny of a gas is directly proportional to pressure, inversely proportional to temperature and directly proportional to:

Choose an answer

Viscosity

Molar mass

Momentum

All of above

Acetone reacts with HCN to form a cyanohydrin. It is an example of

Choose an answer

Nucleophilic addition

Electrophilic substitution

Electrophilic addition

Nucleophilic substitution

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

Choose an answer

Double

Same

Half

Four times

Bonding in MgO is an example of

Choose an answer

lonic bond

Polar bond

Covalent bond

Coordination covalent bond

Dehydrohalogenation of secondary butyI bromide will give

Choose an answer

Propene

1-Butene

Butene

2-Butene

Which of the following is the correct equation to calculate relative molecular mass of a gas

Choose an answer

M=mPRTV

M=mPR/VT

M=PV/mRT

M=mRT/PV

Primany aleohols sornally give us aldehyde when oxidized in the presence of acidified Na2Cr2O7, what will be the product, when the secondary alcohols are oxidized in same condition?

Choose an answer

Alkenes

Alkyl halide

Alkynes

Ketones

Dipole-dipole forces are present between:

Choose an answer

non-polar molecules

polar molecules

both polar and non-polar

none pf above

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

Choose an answer

remains unchanged

increases unchanged

reduces to 1/4

increases 4 times

If Cl2 is passed through hot NaOH. NaCIO3 is formed and the oxidation number of CI changes from

Choose an answer

-1 to 0

0 to +5

0 to-1

0 to +1

Estyl butyrate has flavour like

Choose an answer

Banans

Jasmine

Pineapple

Orange

Which one is an isomorphic pair?

Choose an answer

NaNO3, CaCO3,

NaF, MgO

K2SO4 ,K2Cr2O7

Zn, Cd

If a graph is plotted between temperature on x-axis and volume on Y-axis for 1 mole of gas,then we get straight line which cuts the temperature axis at

Choose an answer

-300°C

300 K

-273.15 K

273.15°C

The actual volume of gas molecules is considered negligible at following pressures

Choose an answer

2atm

4atm

6 atm

8 atm

which one of the following statements bout negative ions is incorrect?

Choose an answer

they are also know as anions

they are formed when atoms gain electrons

they are large than the atom from which they were formed

they are smaller than the atom from which they were formed

At ordinary temperature, the most nearly ideal gases are

Choose an answer

N₂

He

H₂

all these

If rate of diffusion of A is 5 times that of B,what will be the density ratio of A and B?

Choose an answer

1/25

1/5

25

5

Higher the surface area available for reaction

Choose an answer

slower the reaction

faster the reaction

constant the reaction

lower the Ea

Which if the following will have the same number of molecules at S.T.P?

Choose an answer

280cm³ of CO₂ and 280cm³ of N₂O

11.2dm³ of O₂and 32g of O₂

44g of CO₂and 11.2dm³ of CO

28g of N₂and 5.6dm³ of oxygen

The transition temperature of KNO3, is

Choose an answer

13.2°C

95.5°C

128°C

32.02°C

What is true for a molecule with standard geometry

Choose an answer

It lacks a Ip

It can't be a donor

It can be an acceptor

All

Which one of the following is not true relationship

Choose an answer

Which is not true in case of an ideal gas?

Choose an answer

It cannot be converted into a liquid

There is no interaction between the molecules

All molecules of the gas move with same speed

At a given temperature P'V is proportional to the amount of the gas

A mixture of 1-chloropropane and 2-chloro-propane when treated with alcoholic KOH, gives

Choose an answer

Prop-2-ene

Isopropy lene

Propene

A mixture of prop-l-ene

Two moles of an ideal gas at 1 atm are compressed to 2 atm at 273 K.The enthalpy change for the process is

Choose an answer

2 litre atm

1 litre atm

Zero

3 litre atm

The nature of crystal of diamond is

Choose an answer

metallic

molecular

covalent

ionic

What is the formula of talc or soapstone?

Choose an answer

Na2B4O7.10H2O

H2Mg3(SiO3)4

Cu2S

NaNO3

On the basis of intermolecular forces diamond is a

Choose an answer

ionic solid

covalent solid

metallic solid

molecular solid

The change in enthalpy of a system when one mole of the substance is completely burnt in excess of air or oxygen is called

Choose an answer

Heat of reaction

Heat of formation

Heat of atomization

Heat of combustion

The volume of a real gas

Choose an answer

is constant

increases with T decrease

becomes zero at absolute zero

never becomes zero

Which one of the following statements about sodium chloride is incorrect?

Choose an answer

it has a high melting point

it conducts electricity at room temperature

it is soluble in water

it is brittle

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

Choose an answer

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

Butane has isomeric forms

Choose an answer

3

4

2

1

The instrument that is used to measure the pressure of a gas is called

Choose an answer

viscometer

photometer

barometer

stalagmometer

Low IE is a symbol of

Choose an answer

high electronegativity

small size

High electron affinity

Metallic character

Which of the following is electrophile for alkylation?

Choose an answer

NO+2

SO3

R+

Both a & b

The product of pressure and volume remains constant when temperature and quantity of gas is:

Choose an answer

Zero

Variable

Kept constant

None of above

Which of the following is not a property of crystalline solid

Choose an answer

geometric shape

cleavage plane

anisotropy

isomerism

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 there are weak intermolecular forces in a liquid, it will be

Choose an answer

more volatile

less volatile

more dense

less heavy

Slight oxidation of primary alcohol eives

Choose an answer

Ketone

Aldehyde

-Organic acid

An ester

Ethene can give all of the following reactions except

Choose an answer

Addition

Free radical substitution

Hydrohalogenation

Hydration

In which one of the following does the central atom not possess an 'octet' in its outer shell?

Choose an answer

BH₃

CH₄

NH₃

H₂O