Question # 1

What is the sequence of electron take up and removal from 4s orbital a transition metal in 3d series?

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Enters first, leaves after 3d electrons removal

Enters after 3d electrons, leaves after 3d electrons

Enters after 3d eleetrons, leaves first

Enters first and leaves first

The most suitable temperature for preparing ammonia gas is

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250℃

450℃

350℃

550℃

How magnesium reacts with water?

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In frozen ice water

With cold water

In with steam

In hot state

The cause of deviation form ideal behaviour is because

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the actual volume of gas molecules is not negligible

there is force of attraction between molecules of a gas

both a and b

none of these

Consider the following reaction
R-CHO + 2Ag(NH3)2OH + R-COONH+ +2Ag+2NH3+H2OThis reaction represents

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Fehling test

Ninhydrin test

Benedict lest

Tollen's test

TiCl4 is used as catalyst for manufacture of

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Sulphuric acid

Plastics

Ethanol

Tetraethyl lead

In which of the following processes the liquids are made to boil at low temperature

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Vacuum distillation

Destructive distillation

Distillation

Vacuum destructive distillation

Which of the following is more reactive where 0-H bonds break

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P°alcohol

T° alcohol

S°alcohol

Cannot be predicated

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

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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

The oxidation of 1 - propanol in the presence of H2SO4, +K2Cr207 produces final product

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Acetaldehyde

Propanal

Acetone

Propanoic acic

When two ice cubes are pressed together they unite to form one cube. which of the following forces is responsible for holding them together?

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H-bonding

Covalent bonding

van der waal's forces

dipole-dipole interaction

Lonic solids are characterized by:

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low melting points

_{good conductivety in solid state}

high vapour pressures

solubility in polar solvents

Equal volumes of gases at the same temperature and pressure contain equal number of particles.This statement is direct consequence of

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Perfect gas law

Partial law of volumes

Charle's law

Ideal gas equation

Graham s law refers to

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Boiling point of gases

Gas compression problems

Gaseous diffusion

Volume changes of gases due to change in temperature

Which one is not related with evaporation

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Continuous

Cooling

Exothermic

Spontaneous

Density of a gas is usually expressed in

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Kg m³

Kg dm³

g dm^-3

g cm^-3

The forces of attraction between ions and water molecules are known as

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dipole-dipole forces

London forces

dipole- induced dipole forces

ion-dipole forces

Electrons in 5d energy level are filled up in case of

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Lanthanides

Transition metals

Actinides

Rare gases

When graph is plot between P and 1/V at constant temperature. A straight line obtains which move toward ______ when temperature increase

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Pressure axis

Volume axis

1/V axis

1/P axis

Value of gas constant R is

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8.314 J K^-1mol^-1

0.082 J K^-1mol^-1

273.15 J K^-1mol^-1

101325 J K^-1mol^-1

The geometry of diamonds is

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tetragonal

cubic

rhombohedral

none of these

If internal energy of the system is increased

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Change in state of the system may occur

Temperature of the system may rise

Chemical reaction may take place

All of these

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

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1

2

3

4

The crystal system are of

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7 types

10 types

5 types

8 types

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

2-propanol on Oxidation gives

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Aldehyde

Carboxylic Acid

Ketone

Alcohol

The phenomenon in which sudden expansion of a gas causes cooling is called

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evaporation

cooling

Joule Thomson effect

sublimation

The surface formed by the breakage of a crystal is called _____ plane

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Crystal

Unit

Cleavage

None

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?

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Alkenes

Alkyl halide

Alkynes

Ketones

A real gas most closely approaches the behaviour of an ideal gas at

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15 atm. and 200 K

1 atm. and 273 K

0.5 atm.and 500 K

15 tm, and 500 K

Stronger is the oxidizing agent, stronger is the

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emf of cell

Oxidation potential

Reduction potential

Proteins have linkage between amino acids

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imide

amide

ester

ether

Total number of valence electrons in phosphonium ion (PH4-) is

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8

9

12

10

Some substance are good conductors of electricity in both the solid and liquid states. These substance are generally:

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molecular solids

ionic substances

metallic substances

covalent network solids

The vapour density of a gas is 11.2.The volume occupied by 11.2 g of this gas at N.T.P is

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22.4 litres

11.2 litres

1 litre

2.24 litres

Which does not affect vapour pressure

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Nature of liquid

intermolecular forces

Temp

None of these

The critical temperature of CO₂______°C at 73 atm critical pressure

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21.142

28.892

31.142

35.452

The electrolyte used in fuel cell is

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КOH

NaCl(aq)

NaNO3

Molten NaCl

Which is an intermediate in Svl

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Ethoxide ion

Alkene

Alkyl halide

Carbocation

The protein component of enzyme ls called

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apoenzyme

proenzyme

holoenyme

co-enzyme

The compound used to distinguish the ethyne and ethene is

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Alkaline KMnO4

Ammonical AgNO3

Bromine water

Tollen's Reagent

Number of electrons involved in d-d transition of [Ti(H2O)6]+3

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1

3

2

4

Which forms metallic crystals

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Cu

NaCI

SO₂

NH₄CI

Haemoglobin molecule is how many times heavier than helium atom

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68000 times

17000 times

,34000 times

, 1700 times

The change in enthalpy when one mole of a substance is dissolved in a specified quantity of solvent at a given temperature is called

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Heat of reaction

Heat of solvation

Heat of combustion

Heat of solvent

The reaction of alkyl halide in the presence of alcoholic KOH is

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Substitution

Addition

Acid-base

Elimination

If temperature is 73K and volume is 146 cm3 then calculate the value of K=V/T

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5

4

3

2

Temperature at which molecular motion ceases is called

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Absolute zero

Absolute temperature

Critical temperature

Difficult to predict

suppose that an ocean of mercury replaced all the air of the air of the earth . How deep would this ocean have to be to exert the same pressure as the air:

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77cm

76cm

79cm

78cm

Combustion analysis is performed for the determination of

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Molar mass of the compound

Empirical formula of the compound

Structural formula of the substance

Mass of halogens present in organic compounds

The number of moles of CO2 which contain 16g of oxygen

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0.25

1.00

1.50

0.50

Dehydrogenase is an example of

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ligase

oxidoreductase

lyase

hydrolase

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

Which among the following will show anisotropy?

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Wood

Glass

Paper

BeCl2

If allowed to expand, the gases suddenly

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heat up

move randomly

react

cool down

Which one of the following will behave least like an ideal gas at high temperature and low pressure?

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hydrogen fluoride

helium

oxygen

carbon dioxide

Dehydrohalogenation of alkyl halides happens in the presence of

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Pd

Ni

Zn

KOH/alcohol

If ionic product is equal to Ksp then the solution is

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Unsaturatec

Ideal

Supersaturated

Saturated

What is the weight of 10 dm³of CO₂at 27°C and 2 atm?

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89.3 g

56.1 g

125 g

127 g

Active sulphonating agent during sulphonation of benzene is

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SO2

SO3

SO3H

SO3+

How many grams of NaOH are present in 250 cm3 of its 0.2M solution

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,4 g

, 0.4 g

, 10 g

, 2 g