Question # 1

The orbitals having n + l = 5 are

Choose an answer

2p, 3d,3s

3p, 3d, 5s

3s, 4p, 4d

5s, 4p, 3d

which enzyme is not involved in the fermentation of starch ?

Choose an answer

Diastase

Zymase

Urease

Invertase

Which compound would undergo nucleophilic addition

Choose an answer

Ethene, C₂H₄

Bromoethane, C₂H₅Br

Ethanal, CH₃CHO

Ethane, C₂H₆

Which one of the following substances is used to decolourizing agent

Choose an answer

Abestos

Animal charcoal

conc. H2SO4

Silica gel

Replacement of hydrogen by NO₂group is called

Choose an answer

Sulphonatioin

Hydration

Nitration

Cracking

The % of CO₂is the atmosphere is

Choose an answer

3.0%

0.03%

0.3%

0.5%

Which of the following phosphorus is most reactive?

Choose an answer

Red phosphorus

White phosphorus

Scrlet phosphorus

Violet phosphorous

When H₂and I₂are mixed and equilibrium is attained, then

Choose an answer

Amount of HI formed is equal to the amount of H₂dissociated

HI dissociation stops

The reaction stops completely

None of these

Series starting form ₃₉Y to ₄₈CD is in period:

Choose an answer

4th

5th

6th

7th

Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

Choose an answer

Gas molecules collide with anode

Gas molecules are at high temperature

Gas molecules produce X-rays

Cathode rays remove electrons from gas molecules

The iron obtained from blast furnace is

Choose an answer

Pig iron

Wrought ion

Soft ion

Steel

Which of the following solution has the highest boiling point

Choose an answer

5.85% solution of sodium chloride

18.0% solution of glucose

6.0% solution of urea

All have the same boiling point

Butanenitrile is formed by reaction of KCN with

Choose an answer

Propyl alcohol

Butyl chloride

Butyl alcohol

Propyl Chloride

The total number of inner transition elements in the periodic table is

Choose an answer

10

14

28

30

The electron releasing effect of methyl group is significant and it makes ring a good

Choose an answer

Electrophilic

Nucleophilic

Nucleophobic

Hydrophobic

The number of groups in the periodic table is

Choose an answer

6

7

8

9

A carbon atom carrying a postitive charge and attached to three other atoms of groups is called

Choose an answer

Caronium ion

Carbanion

Oconium ion

Carba ion

How many cm³of 1 M H₂SO₄required to neutralize 10 cm³of 1 M NaOH

Choose an answer

2 cm³

2.5 cm³

5 cm³

10 cm³

The mass of the neutron is of the order of

Choose an answer

10^-23kg

10^-24kg

10^-26kg

10^-27kg

The state of hybridization of carbon atom in methane is:

Choose an answer

sp³

sp²

sp

dsp²

In purification of potable water the coagulant used is

Choose an answer

Nickle sulpahte

Copper sulpahte

Barium sulpahte

Alum

Which of the element is not alkali metal

Choose an answer

Lithium

Rubidium

Francium

Magnesium

Replacement of Cl of Chlorobenzene to give phenol requires drastic conditions but chlorine of 2, 4-Dinitrochlorobenzene is readily replaced because

Choose an answer

NO₂makes the electron rich ring at ortho and para positions

NO₂withdraws electrons at metaposition

NO₂donate electrons at m-position

NO₂withdraws electrons at ortho and para position

Generally the bond formed by metals with non-metals is

Choose an answer

Ionic

Covalent

Polar

Non- polar

Carboxylic acids are more acidic than pehnol and alcohol because of

Choose an answer

Intermolecular hydrogen bonding

Formation of dimmers

Highly acidic hydrogen

Resonance stabilization of their conjugate base

The solubility product of AgCl is 2.0 x 10^-10mole ²dm^-6. The maximum concentration of Ag⁺ions in the solution is

Choose an answer

2.0 x 10^-10mole dm^-3

1.41 x 10^-5mole dm^-3

1.0 x 10^-10

4.0 x 10^-20mole dm^-3

Which of the following is commonly called polyamide

Choose an answer

Nylon

Rayon

Terylene

Oridon

If the rate of reaction is independent of the concentration of the reactant, the reaction is of

Choose an answer

Zero order

First order

Second order

Third order

It is common observation that rates of chemical reactions differ :

Choose an answer

Greatly.

A little bit.

Moderately.

Which is made by coordinate covalent bond

Choose an answer

H₃O⁺

H₂O

CH₄

HCl

B-B'-dichloroethyl sulphide is commonly known as

Choose an answer

Mustard gas

Laughing gas

Phosgene gas

Bio gas

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