Question # 1

In an electrochemical series, elements are arranged on the basis of

Choose an answer

pH scale

pKa scale

pOH scale

Hydrogen scale

The highest temperature at which gas can be liquefied and above which liquefaction is impossible is called

Choose an answer

Boiling temperature

Upper consulate temperature

Transition temperature

Critical temperature

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

To prepare ethane by Wurtz synthesis the suitable alkyl halide is

Choose an answer

Ethyl iodide

any alkyl iodide

Ethyl chloride

Methyl bromide

The solid particles posses only ______ kinetic energy

Choose an answer

Translational

Rotational

Viberational

Circular

The electrical conductivity of the metals decreases with the increasing temperature. This is because

Choose an answer

the number of free electrons decrease

the bonds of the metal atoms become weak

the to and fro motion of the metal ions decrease

the increase of to and fro motion of the metal ions hinders the free movement of electrons

The rate of diffusion of a gas of molar mass 72 as compared to H₂will be:

Choose an answer

Same

6 times

1.4 times

1/6 times

Mercury does not wet the glass because of

Choose an answer

repulsion

weak cohesive force

high viscosity

capillary action

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

Choose an answer

10

1000

100

Infinity

Plasma was introduced by

Choose an answer

Crookes

Soddy

Faraday

Van der Waal

The solubility product of AgCl is
2.0 x 10(-10) mol2 dm(-6). The maximum concentration Ag+ ions in the solution is:

Choose an answer

1.41 × 10(-5) mol. dm(-3)

1.41 × 10(-10) mol. dm(-3)

2.0 × 10(-10) mol. dm(-3)

4.0 × 10(-20) mol. dm(-3)

An ideal gas cannot be liquefied because

Choose an answer

Its critical temperature is always above 0°C

Its molecules are relatively small in size

It solidifies before becoming a liquid

Forces operative between its molecules are negligible.

The enthalpy change for the reaction C2H2 + 5/2 O2 --------> 2CO2 + H2O is known as enthalpy of

Choose an answer

Fomation of CO2

Fusion ofC2H4

Combustion of C2H4

Vaporization of C2H2

Which molecule is least ionic"

Choose an answer

NaCI

HCL

HF

CsF

An element from the given below exists as discrete small molecules in the solid state. Which is that?

Choose an answer

Sodium

Silicon

lodine

lron

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

What is the formula of clay?

Choose an answer

Asbestos

Talc

H2Al2(SiO4)2.H2O

Na2SiO3

Which of the following is not a property of enzymes?

Choose an answer

extraordinary speciffcity

reversibility of reactions

high efficiency

minimum activity at optimum T

Substituted phenyl group are called

Choose an answer

Arene groups

Alkyl groups

Aryl groups

Acyl groups

Alicyclic compounds are the homocyclic compounds which contain a ring of

Choose an answer

5 or more carbon atoms

6 or more carbon atoms

3 or more carbon atoms

4 or more carbon atoms

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

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

Choose an answer

Mg

HCI

Both are in stoichiometric amounts

None of these

Diamond and silicon carbide are insoluble in all solvents because

Choose an answer

they have high melting and boiling points

absence of three electrons

they are huge giant three dimensional molecules (macromolecules)

their unit cells have tetrahedral geometry

Which of the following is not a category of proteins based upon their function?

Choose an answer

genetic

Regulatory

nucleo

structural

CO₂gas is dissolved in water due

Choose an answer

dipole-dipole interactions

higher molecular mass of CO₂

ion dipole attractive forces

hydrogen bonding

Carbon-Carbon double bond length in C3H6

Choose an answer

154 pm

134 pm

120 pm

105 pm

C=O and C=C bonds are differentiated by

Choose an answer

Hybridization of C-atom

Bond angles

Ammonical AgNO3

Conc. HNO3

which of the following is a typical transition metal?

Choose an answer

Sc

Y

Ra

Co

London dispersion forces are also called

Choose an answer

Ion-dipole forces

Dipole-induced dipole forces

Dipole-dipole forces

Instantaneous dipole induced dipole forces

H3O+ can't accept a Ip because

Choose an answer

it has positive charge

The central atom is not electron deficient

The shell of oxygen has reached its limit

it already has a coordinate bond

How much heat is absorbed by 100 g of water when its temperature decreases from 25°C to 5°C? (heat capacity is 4.2 J/gK)

Choose an answer

84,000J

2000/4.2J

-2000/4.2j

-8400J

The gas which obey's the gas laws at all conditions of temperature and pressure is called:

Choose an answer

Perfect gas

Super gas

Ideal gas

Real gas

Value of gas constant R is

Choose an answer

8.314 J K^-1mol^-1

0.082 J K^-1mol^-1

273.15 J K^-1mol^-1

101325 J K^-1mol^-1

For a particular halogen, the reactivity of alkyl halides

Choose an answer

remains same with C-increase

decreases with C-increase

increases with C-increase

decreases with C-decrease

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

Choose an answer

6.02×10(23)

6.02× 10(25)

6.02×10(22)

6.02×10(21)

Which of the following is soluble in water?

Choose an answer

СН3ОН

CCL4

CHCI3

CS2

One mole of SO2 contains

Choose an answer

6.022 x 10(23) atoms of oxygen

6.022x 10 ê23 atoms of sulfur

18.1x 10 (23) molecules of SO2

4 g molecule of SO2

If a gas expands at constant temperature

Choose an answer

The pressure decreases

The Kinetic energy of the molecules remains the same

The kinetic energy of the molecules decreases

The number of molecules of the gas increase

Which compound shows the highest melting point

Choose an answer

water

Propanoic acid

Methanoic acid

Ethanoic acid

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

Phenol is completely soluble in water above

Choose an answer

25°C

62.3℃

68.5°C

66.50°c

Estyl butyrate has flavour like

Choose an answer

Banans

Jasmine

Pineapple

Orange

The emf produced by galvanic cell is called

Choose an answer

Cell potential

Oxidation potential

Redox potential

Reduction potential

A molecule that has polar bonds but is overall non - polar

Choose an answer

IF

CCl4

PCI3

All

The scale of temperature that shows the freezing point of water at 0° is called

Choose an answer

Fahrenheit

Kelvin

absolute

Celsius

The value of van der Waal s constant a for gases CO₂, N₂, and SO₂, are 3.59 ,1.39, 1.36, and 6.17 atm dm⁶ mol^-2respectively the gas which can be most easily liquefied is

Choose an answer

CO₂

O₂

N₂

SO₂

The highest oxidation state of manganese is

Choose an answer

+7

-7

+6

+4

The compound that has zero dipole moment is

Choose an answer

HCl

H₂S

NH₃

CH₄

A crystal system in which all three angles and all three edges are different is called

Choose an answer

triclinic

rhombohedral

cubic

hexagonal

Transition compounds which occur as tripositive ions have no

Choose an answer

4s-electron

3p-electron

3s-electron

2s-electron

The densities of two gases are in the ratio of 1 : 16.The ration of their rates of diffusion is

Choose an answer

16 : 1

4 : 1

1 : 4

1 : 16

TiCl4 is used as catalyst for manufacture of

Choose an answer

Sulphuric acid

Plastics

Ethanol

Tetraethyl lead

The polarizabilities of elements mostly increase down the group due to the reason that

Choose an answer

the atomic numbers increase

number of protons increase

number of shells increase along with increase of shielding effect

the behaviour of the elements remain the same

R = 0.08205:

Choose an answer

atm dm³mol^-1k^-1

J mole^-1k^-1

Nm mol^-1k^-1

cal. mol^-1k^-1

which of the following is not a symmetrical ketone

Choose an answer

4-heptanone

Butanone

Propanone

3-pentanone

1 gram formula refers to

Choose an answer

Amount in grams equivalent to 1 mole of a atom

Amount in grams equivalent to 1 mole of a covalent compound

Amount in grams equivalent to 1 mole of a ionic compound

Amount in grams equivalent to 1 mole of an ion

The spreading of ink on blotting paper is due to

Choose an answer

capillary action

hydrogen bonding

intermolecular forces of the ink

intermolecular forces of the ink and paper

Enthalpy of formation of one mole of ionic compound form gaseous ion under standard condition is called

Choose an answer

Gibb's energy

Bond energy

Lattice energy

Diamond is a bad conductor of electricity because:

Choose an answer

it has a tight structure

it has a high density

there are no free electrons

none of the above

Viscosity of a liquid is measured by

Choose an answer

barometer

thermometer

viscometer

manometer

All are examples of different classes of enzymes except

Choose an answer

Hydrolases

Isomerases

Oxido-reductases

Mutases

Enzymes consist of

Choose an answer

proteins only

proteins and non-protein parts

fats only

futs and non-fatty components