Question # 1

In water the most important oxidizing agent is dissolved molecular oxygen which ranges from

Choose an answer

2 - 4 ppm

4 - 6 ppm

2 - 5 ppm

4 - 8 ppm

A compound possessingα-hydrogen atom, in the presence of dilute alkali formsβ-hydroxy aldehyde. This product on heating with dilute acid forms an unsaturated crotonaldehyde. The compound is

Choose an answer

CH₃CHO

CH₃CH₂CHO

CH₂= CH - CHO

HC = C - CHO

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

All are ortho & Para directing except

Choose an answer

X

OH

NR₃

NH₂

In Friedal-Craft's alkylation besides AlCl3 the other reactants are

Choose an answer

C6H6 + NH3

C6H6 + NH4

C6H6 + CH3Cl

C6H6 + CH3COCl

A filtration process could be very time consuming if it were not aided by a gentle suction which is developed:

Choose an answer

If the paper covers the funnel up to its circumstances

If the paper has got small sized pores in

If the stem of funnel is large so that it dips in to filtrate

If the paper fits tightly.

Enzymes are

Choose an answer

Proteins

Minerals

Oils

Fatty acids

The fibre which is made form acrylonitrile as monomer

Choose an answer

PVC

Rayon fibre

Acrylic fibre

Polyester fibre

Ethanal may be converted into a three-carbon acid in a two-step process.

Which compound is the intermediate

Choose an answer

CH₃CO₂H

CH₃CN

CH₃CH₂CN

CH₃CH(OH)CN

Which is not true with respect to cathode rays?

Choose an answer

A stream of electrons

Charged particles

Move with speed as that of light

Can be deflected by magnetic fields

Vinegar is dilute solution of:

Choose an answer

Acitic acid

Formic acid

Butyric acid

Propionic acid

Balmer's series is in ______ region

Choose an answer

Visible

U V

I. R.

None

If Grignard reagent is allowed to react with another alkyl halide the main product is

Choose an answer

An alkane

Cyclo alkane

Alkyne

An alkene

The vant Hoff factor (1) accounts for

Choose an answer

Degree of solubilisation of solute

The extent of dissolution of solute

The degree of decomposition of solution

Which of the following is an inert gas?

Choose an answer

H₂

O₂

N₂

Argon

The acid present in vinegar is

Choose an answer

CH₃COOH

HCI

H₂SO₄

HCOOH

The equivalent conductivity of 0.1 M week acid is 100 times less than at infinite dilution. The degree of dissociation is

Choose an answer

100

10

0.01

0.001

The temp. used for the hydrogenation of alkenes using Ni is

Choose an answer

2000°C

400°C

200-- 300°C

1000°C

n + l value for 4f will

Choose an answer

2

5

7

9

Rutherford's atomic model suggests the existence of

Choose an answer

Atom

Nucleus

alpha particle

Measons

f-Block elements are also called

Choose an answer

Non typical transition elements

Outer transition elements

Normal transition elements

Inner transition elements

The reaction between fat and NaOH is called

Choose an answer

Esterification

Hydrogenolysis

Fermentation

Saponification

Which of the following waste material is not recycled for use again

Choose an answer

Paper

Plastic

Hides of animals

Glass

Acyl halide is formed by reacting PCl₅with

Choose an answer

Alcohol

Ester

Amide

Both carboxylic acids as well as esters

10 ml of 1.5 M NaOH solution is neutralized by 20 ml of a-M HCl solution. The value of 'a' will be

Choose an answer

1.0

0.75

0.5

0.25

The conductivity of strong electrolyte

Choose an answer

Increases on dilution slightly

Does not change on dilution

Decreases on dilution

Depends on density of electrolyte it self

When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:

Choose an answer

Alpha rays.

Negative particles.

Electromagnetic rays.

Positive particles.

Bohr model of atom is contradicted by:

Choose an answer

Planck's quantum theory

Pauli's exclusion theory

Heisenberg's uncertainty principle.

All of above.

Acetamide is prepared by

Choose an answer

Heating ammonium acetate

Heating methyl cyanide

Heating ethyl acetate

The hydrolysis of methyl cyanide

Which is a weak nucleophile

Choose an answer

OH^-

Br^-

NH₃

CI^-

Teflon, styron and neoprene are all

Choose an answer

Copolymers

Condensation polymers

Homopolymers

Monomers

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