Chemistry: MCQ Test (25 questions)

Question 1 of 25

The change of a solid substance directly into vapor state without changing into liquid is called_

Adistillation
Bboiling
Csublimation
Dcompaction

Question 2 of 25

Leaving bleaching powder open for a long time reduces its activity. Why does this happen?

Areacts with CO² to release CI²
Breacts with CO² to release O²
Creacts with CO² to release CH⁴
Dnone of these

Question 3 of 25

It is soluble in water_

Aethyl alcohol
Bchloroform
Ccarbon dioxide
Dcarbon tetrachloride

Question 4 of 25

Which of the following statements is correct about bleaching powder and DDT?

ABoth are inorganic compounds. Both contain chlorine compounds.
BBoth are organic compounds
CBoth contain chlorine compounds.
DBoth contain calcium compounds.

Question 5 of 25

Which of the following gases contributes the most to global warming?

Acarbon dioxide
Bchlorofluorocarbons
Cnitrous oxide
Dmethane

Question 6 of 25

Which of the following gases is present in soft drinks under pressure?

ACO²
BCO
CN²O
DN²

Question 7 of 25

Which reactive radical is present in ketone?

A—CHO
B—COOH
CC=O
D—OH

Question 8 of 25

The gas responsible for global warming is ____

Acarbon dioxide
Bcarbon monoxide
Cnitrous oxide
Doxide on nitrogen

Question 9 of 25

Which element comes before carbon in the modern periodic table

ALithium
BMagnesium
CBoron
DBeryllium

Question 10 of 25

Lac is a_

Anatural allotrope
Bnatural polymers
Csynthetic polymer
Dnone of these

Question 11 of 25

The chemical formula of sodium aluminate is

ANaOH
BNa²AIF⁶
CNaAlO²
Dnone of these

Question 12 of 25

The initial stage of coal formation is ____

Apeat
BLignite
Cbituminous
DAnthracite

Question 13 of 25

The electronic configuration of the atom with atomic number 20 is-

A2, 8, 10
B2, 6, 8, 4
C2, 8, 8, 2
D2, 10, 8

Question 14 of 25

Isomeric compounds show differences

Ain physical properties
BIn chemical properties
Cin the molecular formula
Din all of the above

Question 15 of 25

Normal butane and iso butane are-

AOptical isomer
Bchain isomer
Cposition isomer
Dfunctional isomer

Question 16 of 25

Which of the following forms is an allotrope of Chiminster fullerene?

APhosphorus
BIron
CCarbon
DBoron

Question 17 of 25

The semen of bulls is kept for artificial insemination.

Ain liquid ammonia
Bin liquid oxygen
Cin liquid nitrogen
Din liquid hydrogen

Question 18 of 25

Which of the following is not an ore of iron?

ACuprite
BHematite
CMagnetite
DSiderite

Question 19 of 25

Ions that have the same number of electrons are called ____.

AIsotopic
Bisothermal
CSamnetronic
DSamnetronic

Question 20 of 25

Another name of hydrochloric acid is-

AGallic acid
Bpicric acid
CMuriatic acid
Dchloric acid

Question 21 of 25

The plastic obtained by polymerization of ethylene is ____

ATeflon
BBakelite
CNylon
Dpoly ethylene

Question 22 of 25

Different forms of the same chemical element are called—

Aanion
Bcation
Cbuffer
Dallotrope

Question 23 of 25

Carborundum is another name for which of the following?

Acalcium carbide
Bcalcium oxide
Csilicon carbide
Dsilicon oxide

Question 24 of 25

Mohr Salt is—

ASimple salts
Bhybrid salts
Cdouble salt
Dcomplex salts

Question 25 of 25

Which gas is present in both natural gas and biogas?

Amethane
Bbutane
Chydrogen
Dcarbon monoxide