Question # 1

Which one is the most toxic?

Choose an answer

Carbon

CO

CO₂

SO₂

The ratio of moles of a particular component of solution to total moles of all components of solution is :

Choose an answer

Mole fraction.

Molality.

Molarity.

Normality.

Cannizzzaro's reaction is not given by:

Choose an answer

Formaldehyde

Acetaldehyde

Benzaldehyde

Trimethyl

Introduction of a second methyl group in methylbenzene will give how many isomeric dimethyllenzenes

Choose an answer

2

1

3

4

Molecular orbitals are filled with the available electrons according to:

Choose an answer

Hund's of rule.

Pauli's exclusion principle.

Aufbau principle.

All of above.

Although hydrogen resemble with the elements of group lA, IVA and Vll but it is usually placed in

Choose an answer

Group IA

Group IV A

Group VII

Group VIII

How does the ionization energy of 1st group elements vary?

Choose an answer

Increases down the group

Decreases down the group

Remains unchanged

Variation is not regular

which one of the following is not a nucleophile?

Choose an answer

H₂O

H₂S

BF₃

NH₃

A nucleoside may be

Choose an answer

Ribonuleoside

Deoxyribonucleoside

Both a and b

None

An ionic compound M₂S₃is formed by the metal M,, the metal is

Choose an answer

Ca

Ba

K

Al

CsF is an ionic compound because:

Choose an answer

High I.P of Cs and high E.A of F.

High I.P of Cs and low E.A of F.

Low I.P of Cs and high E.A of F.

Low I.P of Cs and low E.A of F.

Choose the correct answer of transition elements?

Choose an answer

Transition elements have low melting points

Transition elements do not have catalytic activity

Transition elements exhibit variable oxidation states

Transition elements exhibit inert pair effect

The relative abundance of Pb isotopes is 1.5% Pb²⁰⁴, 23.6% Pb²⁰⁶, 22.6% Pb²⁰⁷, 52.3% Pb²⁰⁸The relative atomic mass of Pb is

Choose an answer

207.94

208.24

206.94

207.24

Which of the following possesses the highest melting point?

Choose an answer

Chlorobenzene

0-Dichlorobenzene

m-Dichlorobenzene

p-Dichlorobenzene

Carbon monoxide is harmful to human beings as it

Choose an answer

Is carcinogenic

Is antagonistic to CO₂

Has higher affinity for hemoglobin as compared to oxygen

Is destructive to O₃

Phosphate pollution is caused by

Choose an answer

Weathering of phosphate rocks only

Agricultural fertilizers

Phosphate rocks and sewage

Sewage and agricultural fertilizers

The substance which contains the water of crystallization is called

Choose an answer

Hydrated

Solvated

Crystal

None

Anode is the surface on which probability of finding electron is:

Choose an answer

50%

Less than 10%.

More than 95%.

Zero.

Dehydrohalogenation of alkyl halides produces

Choose an answer

Alcohol

Alkane

Alkene

Alkyne

The Electro-negatively difference for ionic bond must be greater than

Choose an answer

1.6

1.7

1.8

1.0

A solution of glucose is 10% The volume to which 1g mole of it dissolved will be :

Choose an answer

8.1 dm³

1.7 dm³

1.8 dm³

6.1 dm³

Choose an answer

32

64

16

4

When copper is allowed to react with HNO₃, the reaction is slow in the beginning, finally becomes very fast. It is due to the formation of an auto catalyst which is

Choose an answer

Cu(NO₃)₂

CuO

O₂

HNO₂

Which of the following species has the highest ionization potential?

Choose an answer

Ne

Al⁺

Mg⁺

Li⁺

Use of ethanol as:

Choose an answer

Drink

Solvent and fuel

In beverage

All of these

Glycine at pH7 has the structure

Choose an answer

H₂N -- CH₂-- COOH

H₃N⁺-- CH₂-- COOH

H₂N -- CH₂COO^-

H₃N⁺-- CH₂-- COO^-

Which of the following oxides is amopheric in character?

Choose an answer

CaO

CO₂

SiO₂

SnO₂

Which of the following posses linear geometry

Choose an answer

Alkane

Alkene

Alkyne

Benzene

Which oxide of nitrogen is obtained on heating ammonium nitrate at 250° C?

Choose an answer

Nitric oxide

Nitrous oxide

Nitrogen dioxide

Dinitrogen tetraoxide

The main structure features of proteins is

Choose an answer

An ester linkage

An ether linkage

The peptide linkage

All

The amount of heat evolved or absorbed in a chemical reaction indicated by balanced chemical equation at 25° and one atmospheric pressure is called

Choose an answer

Enthalpy of formation

Enthalpy of neutralization

Enthaply of combustion

Enthaply of reaction

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