Question # 1

According to charles law there will be a change in the volume of a given mass of a gas by 1/273 of its original volume at 0°C if the temperature of the gas is changed by

Choose an answer

10°

1°C

100°C

2°C

The nature of crystal of diamond is

Choose an answer

metallic

molecular

covalent

ionic

In which of the following Equilibria will Kc and Kp have not the same value

Choose an answer

2HI <--------> H2+I2

2SO2 + O2 <--------> 2SO3

N2 + O2 <---------> 2NO

All of these

Calorie is equivalent to

Choose an answer

0.4184J

4.184J

418.4J

40.18J

If a strip of Cu metal is placed in a solution of FeSO4

Choose an answer

Cu will be deposited

Cu and Fe both dissolve

Fe is precipitated out

No reaction take place

Active sulphonating agent during sulphonation of benzene is

Choose an answer

SO2

SO3

SO3H

SO3+

The weight of 11.2 liters of CO₂ at S.T.P would be

Choose an answer

88 g

44 g

32 g

22 g

In dilatometric method is directly proportional to extent of reaction

Choose an answer

Change in concentration

Change in pressure

Chang in volume

Change in temperature

A compound that has a nucleophilic carbon?

Choose an answer

C2H2

C2H4

C3H8

C6H6

The protein component of enzyme ls called

Choose an answer

apoenzyme

proenzyme

holoenyme

co-enzyme

The diffusion of gasses at absolute zero will be:

Choose an answer

Slightly decrease

unchanged

Slightly increased

Zero

Half-lives required to convert 100% reactant to produet for a first order reaction are

Choose an answer

10

1000

100

Infinity

Greater shielding effect corresponds to ionization potential value

Choose an answer

greater

lesser

remain same

no effect

Equal volume of all gases at same temperature and pressure contain number of molecules:

Choose an answer

multiples

equal

different

in fractions

which one pair has the same oxidation state of-Fe?

Choose an answer

FeSO4 and FeCl4

FeCl4and FeCl3

FeSO4 and FeCl2

Fe2(SO4)3 and FeSO4

Sudden expansion of gas molecule cause cooling because

Choose an answer

Expansion release some amount of energy

During expansion new force of attraction are developed and energy is released

During expansion force of attraction between closest molecules break and energy is used

Kinetic energy of gas molecules increases

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

Choose an answer

habit of crystal

polymorphism

anisotropy

cleavage

The ideal gas law holds best under the conditions of

Choose an answer

high pressure and high temperature

low pressure and high temperature

low pressure and low temperature

high pressure and low temperature

The reagent for alkaline hydrolysis of ethyl bromide to form ethyl alcohol is

Choose an answer

water at room T

Alcoholic KOH+heat

Ethanol + heat

dil. NaOH+ heat

In gasses and liquid, temperature is the measure of:

Choose an answer

Average transnational kinetic energies of molecules.

Average vibrational kinetic energies of molecules.

Average rotational kinetic energies of molecules.

None of above.

The number of atoms or molecules whose concentrations determines the rate of a chemical reaction is called the

Choose an answer

Molecularity of the reaction

specific activity of the reaction

Order of the reaction

rate constant of the reaction

Buffer solutions are used in except

Choose an answer

Clinical analysis

Nutrition

Soil science

Qualitative analysis

The number of molecules in one dm³of water is close to:

Choose an answer

6.02/22.4 x10²³

12.04/22.4 x10²³

18/22.4x 10²³

55.6x6.02x10²³

The question vapour cause by heating a liquid is due to:

Choose an answer

increase of intermolecular interactions

increase of K.E of molecules

decrease of surface tension

increase in potential energy of molecules

The amount of heat required to vaporize one mole of liquid at its boiling point without change in temperature is called

Choose an answer

molar heat of vaporization

molar heat of sublimation

molar heat of fusion

none of these

If allowed to expand, the gases suddenly

Choose an answer

heat up

move randomly

react

cool down

Methyl cyanide, on boiling with mineral acids yield

Choose an answer

Acetic acid

Formic acid

Propanoie acid

Butanoic acid

A gas is heated in such a way that its volume and absolute temperature both are doubled. the pressure of gas:

Choose an answer

Becomes 4 time

Becomes half

Becomes 2 time

Remains same

Zn has

Choose an answer

Zero unpaired electrons

Three unpaired electrons

Five unpaired electrons

One paired electrons

Number of moles present in 0.6 gram of silica is (Atomic mass Si = 28, O=16)

Choose an answer

0.01 mole

0.064 mole

0.044 mole

0.054 mole

Which is the example of diffusion of gases

Choose an answer

bubbling in soda bottle

vapour condensing on a moist surface

hot air rising above a candle

spreading of smell from a scent bottle

The Complete oxidation of ethanol produces first Ethanal than

Choose an answer

Ethanal

Propanone

Ethanoic acid

Benzoic acid

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

Stronger the oxidizing agent, higher is

Choose an answer

Redox potential

Standard reduction potential

Reduction potential

_{Oxidation potemial}

A teacher told his student that air is a mixture. This is due to the reason that suddenly a student raised his hand and said:

Choose an answer

it has different properties from its constituents

oxygen can be removed from it

it is colourless

its composition is different at different altitudes.

Van der Waal's forces exist in

Choose an answer

Polar compounds

Non-polar

Covalent

All types of atoms and molecules

Rusting of iron metal Fe occurs when Fe gets converted into Fe2O3 What happen with Fe?

Choose an answer

F'e is neutralized

Fe is sublimed

Fe is reduced

Fe is oxidized

The largest number of molecules are present in

Choose an answer

3.6 g of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

The maximum hydrogen bonding is in:

Choose an answer

diethyl ether

ethanol

water

benzene

London forces are more affective at

Choose an answer

low temperature

high temperature

low pressure

low temperature and high pressure

Which of the following element has high m.p and b.p, it acts as a reducing agent, and can react with bases?

Choose an answer

Sr

Ca

Be

Mg

CH3CH2CH2OH--------A---------B Here B is

Choose an answer

Propyne

Propanal

Propene

Propane

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

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

Choose an answer

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

The best concentration unit used for K⁺ ions present in potable water is

Choose an answer

ppm

Mole fraction

Molarity

Molality

Esterification of CH3COOH isreaction

Choose an answer

Acid base

Electrophilic

Redox

Nucleophilic

Temperature required for the dehydration of ethanol into ethene in the presence of HaSOu is

Choose an answer

130°C

170°C

175°C

180°C

The angle between the unhybridized 2pz orbital and the three sp2 hybrid orbitals in ethene is

Choose an answer

180°

120°

90°

60°

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

Choose an answer

Banana

Jasmine

Pineapple

Orange

The formation of ester from acetic aciad in presence of acid and ethanol is a

Choose an answer

Nucleophilic substitution reaction

Nucleophilic addition reaction

Electrophilic substituion reaction

Electrophilic addition reaction

A certain buffer solution contains equal cone. of X- and HX. Ka for HX is 10(-8). The pH of buffer is

Choose an answer

3

11

8

14

Which one of the following elements is not an alkali metal?

Choose an answer

Na

Sr

Cs

Rb

SiO₂ is an example of:

Choose an answer

metallic crystals

lonic crystals

a crystal whose structure depending upon the temperature

covalent crystals

The general electronic configuration of group IV-A elements is

Choose an answer

ns2, np6

ns2, np4

ns2, np3

ns2, np2

The reaction takes place among the molecules when they have:

Choose an answer

Activation energy

Properly oriented

Concentrated

Activation energy and proper orientation

Compressibility factor for an ideal gas is

Choose an answer

1.5

1.0

2.0

0.5

Evaporation occurs at all temperatures and is effected by

Choose an answer

surface area

temperature

intermolecular forces

all of these

Relationship between volume of a gas and prevailing conditions of temperature and pressure are called

Choose an answer

Gas laws

Equilibrium laws

Rate laws

None of these

Ethyl alcohol reacts with PCL and produces:

Choose an answer

Haloalkane

Alkyl halide & H3PO3,

Alkyl halide & POCl3

Alkyl halides &H3PO4.

Velaric acid is obtained from a herb velarian, its IUPAC name is

Choose an answer

Propionic acid

Pentanoic acid

Butyric acid

Caporic acid

Which of the following statement about the order of reaction is true?

Choose an answer

The order of reaction can only be determined by experiment

a second order reaction is also bimolecular

The order of reaction is always non-zero

The order of reaction increases with increasing temperature