Question # 1

By electrolytic refining of copper , it is ____________ % pure.

Choose an answer

98

99

99.99

100

Atoms of elements combine chemically to form:

Choose an answer

Mixtures

compounds

solutions

ions

............. are sonorous.

Choose an answer

Metals

Solids

Metals

Force

Force per unit area is called:

Choose an answer

volume

pressure

weight

density

In metal hydrides, the oxidation number of hydrogen is

Choose an answer

+1

-1

+2

-2

The symbol of lead us

Choose an answer

As

Pb

Sb

Na

Increase in ________________ increase evaporation.

Choose an answer

Temperature

Stronger

All

None of above

At freezing point which one of the following coexists in dynamic equilibrium?

Choose an answer

gas and solid

liquid and gas

liquid and solid

all of these

Which is an acceptor molecule/ion?

Choose an answer

N₂

O₂

H⁺

CH₄

The component of solution in larger amounts is ____________

Choose an answer

Solute

Solvent

a & b

Nil

Carbon exists in ________________ allotropic forms.

Choose an answer

1

2

3

4

Depending upon temperature variation, atmosphere ins divided into how many regions?

Choose an answer

1

2

3

4

At dynamic equilibrium state:

Choose an answer

Rate of forward reaction≠ Rate of reverse reaction

Rate of forward reaction > Rate of reverse reaction

Rate of forward reaction = Rate of reverse reaction

Rate of forward reaction < rate of reverse reaction

Building are being damaged by acid rain because it attacks.

Choose an answer

Calcium sulphate

Calcium nitrate

Calcium carbonate

Calcium oxalate

When the numbers of moles of both sides are equal in a reaction, then the unit of K_c will be:

Choose an answer

No unit

mol^-2 dm⁶

mol dm³

mol^-2dm

In an irreversible reaction dynamic equilibrium:

Choose an answer

Never establishes

Established before the completion of reaction

Establishes after the completion of reaction

Establishes readily

Which of following is not amphoteric?

Choose an answer

H₂O

NH₃

HCO₃

SO₄

When the magnitude of Kc is very small it indicates.

Choose an answer

Equilibrium will never establish

All reactants will be converted to products.

Reaction will go to completion

The amount of products is negligible

Traces of acetylene are present to coal gas about.

Choose an answer

0.06 %

0.08%

1.1 %

90%

A dynamic equilibrium

Choose an answer

Reaction stops to proceed

Amounts of reactants and products are equal

Rate of forward and reverse reaction are equl

Reaction can no longer be reversed.

Which of one of the following is used as as fumigant:

Choose an answer

Ethyl alcohol

ethylene oxide

ethylene glycol

diethyl ether

Oxidation of alkenes forms:

Choose an answer

Glycol

Glyoxal

Formic acid

Oxalic acid

Which of the hydrogen halide has the highest percentage of ionic character.

Choose an answer

HCl

HBr

HF

HI

In which system all the three axes are of equal length and all angles are at right angle.

Choose an answer

Cubic

Tetragonal

Orthorhombic

Hexagonal

Which of the following species has unpaired electrons in anti-bonding molecular orbitals

Choose an answer

O₂⁺²

N₂^-2

B₂

F₂

An aqueous solution of ethanol is water has vaporu pressure.

Choose an answer

Equal to the of water

Equal to that of ethanol

More than that of H2O

Less than that of water

Forces of attraction between He atoms are.

Choose an answer

Hydrogen bonding

London forces

Debye forces

Ion dipole forces

Solvent extraction is an equilibrium process and is controlled by.

Choose an answer

Law of mass action

The mount of solvent used

The amount of solute

Distribution law

If the empirical formula of compound is CH2 and its molecular mass is 56 than what is the actual molecular formula of this compound.

Choose an answer

CH2

C2H4

C3H6

C4H8

A substance which rerareds the rate of a reaction is called

Choose an answer

Inhibitor

Activator

Auto-catalyst

None of these

The unit of the rate constant is same as that of the rate of reaction in

Choose an answer

First order reaction

Second order reaction

Zero order reaction

Third order reaction

One of the following substances is not used as a drying reagent in a desiccator

Choose an answer

Cons. H₂SO₄

P₂O₅

Silica gel

50% KOH

One of the following liquids has lowest vapour pressure at 32°C. Indicate that liquid

Choose an answer

Ether

Chloroform

Ethanol

Water

In aqua regia, the ratio of conc. HCl to Conc. HNO3 is

Choose an answer

1 : 1

2 :1

1:2

3 : 1

Phenol on heating with concentrated nitric acid forms

Choose an answer

o-nitrophenol

T.N.T

Na2CO3

Cyclohexanol

An aldehyde compound can be reduced to alkane by

Choose an answer

Wurtz reaction

Grignard reaction

Wolf Kishner reaction

Kolbe's reaction

In which compound, oxidation state of sulphur is +6

Choose an answer

H2S

H2SO4

H2SO3

SO3

Alcohol obtained by fermentation is only upto

Choose an answer

10%

12%

20%

95%

Which element when react with chlorine form polymeric halide.

Choose an answer

Na

Be

Ba

P

XeF6 n hydrolysis produces.

Choose an answer

XeOF2

XeOF3

XeOF4

XeF2

Which one of halogens is a liquid

Choose an answer

F₂

Cl₂

Br₂

I₂

Mark the correct statement.

Choose an answer

Na+ is smaller than Na atom

Na+ is large than Na atom

Cl- is smaller than Cl atom

cl- and Cl are equal in size

Which elements are deposited at the cathode during the electrolysis of brine in diaphragm cell

Choose an answer

H₂

Ba

Ra

Rn

Rectified spirit contains alcohol about

Choose an answer

80%

85%

90%

95%