Question # 1

The oxidation number of free element is always taken to be

Choose an answer

0

1

2

-1

The formula of curprite is

Choose an answer

Cu₂S

Cus

Cu₂O

CuCO₃

The osmotic pressure of a dilute solution is directly proportional to the

Choose an answer

Diffusion rate of the solute

Ionic concentration

Elevation in boiling point

Flow of solvent from a concentrated to a dilute solution

Saturated solution of a solid is prepared at a constant temperature. 100 cm³of this saturated solution is evaporated in a china dish. The mass of the residue is called

Choose an answer

Azetropic mixture

Solubility

Solubility product

Equilibrium constant

Choose an answer

Acidified AgNO_3(aq)

Fehling's solution

Na

Na₂XO_3(aq)

The substances which are added to the soil to provide one or more nutrient elements essential for plant growth are called

Choose an answer

Minerals

Hormones

Fertilizers

None of these

Hydrolysis of ethyl-acetate (ester) has order of reaction :

Choose an answer

3

2

1

Geographical survey of Pakistan estimates about billion tons of coal in Pakistan:

Choose an answer

182

183

184

185

Which of the following method is most appropriate for the manufacture of methane?

Choose an answer

By reduction of CH2CL2

Wurtz reaction

Liquification of natural gas

None of these

The sum of mole fractions (X) of components of solution is equal to

Choose an answer

100

200

One

Zero

What happens when CCl₄is treated with AgNO₃solution?

Choose an answer

NO₂will be evolved

A white ppt. of AgCl will form

CCl₄will dissolve in AgNO₃solution

Nothing will happen

Which of the following is used as disinfectant

Choose an answer

K₂Cr₂O₇

KMnO₄

K₂MnO₄

K₂CrO₄

Rate law of an equation is obtained :

Choose an answer

From a balance equation.

Can be calculated theoretically as well as determined experimentally.

It is only calculated theoretically.

Experimentally.

Acetic acid is manufactured by:

Choose an answer

Distillation

Fermentation

Ozonolysis

Esterification

The nature of the positive rays depend on

Choose an answer

The nature of the electrode

The nature of the discharge tube

The nature of the residual gas

All of the above

Benzene reacts with ozone and gives

Choose an answer

Glycerin

Glyoxal

Maleic anhydride

Benzoic acid

The order of reactivity for a given halogen in Grignard's reagent is:

Choose an answer

CH₃X > C₂H₅X > C₃H₄X > C₄H₄X

C₂H₅X > C₃H₇X > C₄H₅X > CH₄X

C₃H₇X > C₄H₇X > CH₃X > C₂H₅X

C₄H₄X > C₃H₇X > C₂H₅X > CH₄X

When chlorofluoro carbon are subjected to U.V. they form

Choose an answer

Cations

Anions

Free radicals

None of these

In CH₄, all the H-C-H bond angles are

Choose an answer

120°

107°

109°

109.5°

The atomic mass is measured in atomic mass unit (a.m.u.) which is equal to

Choose an answer

1.661 x 10^{-27- Kg}

1.661 x 10^-24Kg

1.661 x 10^{-27- g}

1.661 x 10^-24mg

The fourteen elements following actinium are known as

Choose an answer

Lanthanones

Lanthanides

Rare earths

Actinides

6-d series is in the period :

Choose an answer

4th

5th

6th

7th

The solubility product of AgCl is 2.0 x 10^-3 mol² dm^-6 , The maximum concentration of Ag ion in the solution is :

Choose an answer

2.0 x 10^-10 mol dm^-3

1.41 x 10^-10 mol dm^-3

1.0x 10^-10 mol dm^-3

4.0x 10^-10 mol dm^-3

Solvent extraction is an unstable,Process and it is controlled by:

Choose an answer

Alcohol extraction

Petrol extraction

Phenol extraction

Ether extraction

The carbon of a carbonyl group is:

Choose an answer

sp hybridized

sp²hybridized

sp³Hybidized

None of these

A compound X contains 50% sulphur and 50% oxygen by mass. What is the empirical formula of compound X?

Choose an answer

SO

SO₂

SO₃

SO₄

On passing HCI gas through a saturated solution of commercial sodium chloride, pure crystals of NaCI are precipitated due to

Choose an answer

Increase in pH of the solution

Decrease in pH of the solution

Common ion effect

Increase in ionization of NaCl

During nitration of benzene, the active nitrating agent is

Choose an answer

NO3

NO2+

NO2-

HNO3

Vegetable oils are

Choose an answer

Unsaturated fatty acids

Glycerides of unsaturated fatty acids

Glyccerides of saturated fatty acids

Essential oils obtained from plants

When a colourless gas is passed through bromine water only decolourisation takes place the gas is

Choose an answer

SO₂

HBR

HCl

H₂S

Which of the following human activities are contaminating surface and ground waters

Choose an answer

Pesticides

Septic tanks

Petroleum and natural gas production

All of these

More Classes

Other Links

ECAT Chemistry Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer