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Chemistry Worksheet MCQs

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.

Which of the following pairs of gases cannot be collected by downward delivery

a)

SO2 and NH3

b)

CO and N2

c)

Cl2 and N2

d)

SO2 and N2

2.

Nickel is used in the hydrogenation of alkenes because it

a)

increases the yield of the product

b)

lowers the activation energy of the reaction

c)

makes the reaction more exothermic

d)

prevents a reverse reaction from occurring

3.

Aluminum is extracted by

a)

electrolysis of the purified ore

b)

froth floatation of the smelted ore

c)

reduction of the ore with coke in a furnace

d)

roasting the ore in excess supply of air

4.

Which of the following gases is used in fire extinguishers

a)

Carbon (IV) oxide

b)

Nitrogen (IV) oxide

c)

Carbon (II) oxide

d)

Sulphur (IV) oxide

5.

Both Na+ and K+ have

a)

tendency to give electrons

b)

positive reduction potential

c)

tendency to accept electrons

d)

negative oxidation potential

6.

If a gas occupies a volume of 400 cm3 at a temperature of 400 K and a pressure of 1 atm, at what temperature and pressure would its volume be 200 cm3

a)

800 K and 1 atm

b)

800 K and 0.5 atm

c)

200 K and 1 atm

d)

200 K and 0.5 atm

7.

The nucleus of a hydrogen atom consists of

a)

one proton only

b)

one proton and one neutron

c)

one neutron only

d)

one electron only

8.

If acidified K2Cr2O7 acts as an oxidizing agent, the colour changes from

a)

orange to red

b)

yellow to green

c)

orange to green

d)

yellow to red

9.

Which of the following elements is a metalloid

a)

aluminium

b)

selenium

c)

phosphorus

d)

sodium

10.

Iodine could be separated from a mixture of iodine and calcium chloride by

a)

evaporation

b)

sublimation

c)

fractional distillation

d)

fractional crystallization

11.

Sodium chloride is used in the following processes except

a)

treatment of water

b)

manufacturing of chloride

c)

preservation of food

d)

separation of soap glycerol

12.

Which of the following bonds is not an intermolecular force

a)

hydrogen bond

b)

van der Waal’s

c)

dipole-dipole

d)

metallic bond

13.

All the following compound are ionic except

a)

AgCl

b)

KNO3

c)

NO2

d)

(NH4)2CO3

14.

The metal carbonate that would not decompose when heated strongly is

a)

Al2CO3

b)

CaCO3

c)

MgCO3

d)

Na2CO3

15.

In the use of a universal indicator, red colour is an indication that the substances is a

a)

concentrated acid

b)

concentrated alkali

c)

dilute acid

d)

dilute base

16.

Which of the following oxides would form two different types of acids when dissolved in water

a)

CO2

b)

NO2

c)

SO2

d)

SO3

17.

Ethanol could be prepared in the laboratory by

a)

reduction of ethanoic acid

b)

oxidation of primary alkanol

c)

oxidation of alkenes

d)

hydration of ethene

18.

Alkali metals are good conductors of heat and electricity because they

a)

contain delocalized electrons

b)

are found in the d-block

c)

have vibrating ions

d)

are all metals

19.

In a chemical reaction, ΔH is positive when

a)

ΔHproduct > ΔHreactants

b)

ΔHproduct < ΔHreactants

c)

ΔHproduct = ΔHreactants

d)

ΔHproduct = zero

20.

How many pi-bond(s) is/are present in propene

a)

three

b)

six

c)

two

d)

one

21.

Which of the following compounds would readily undergo addition reaction

a)

ethane

b)

butene

c)

ethanol

d)

benzene

22.

The number of moles of KOH present in 200 cm3 of 5.6 g dm−3 solution is [KOH = 56 g mol−1]

a)

2.01

b)

1.12

c)

0.02

d)

0.01

23.

A covalent hydride which does not exist as a gas at room temperature is

a)

H2O

b)

BH3

c)

HCl

d)

H2S

24.

In the electrolysis of dilute hydrochloric acid at the anode

a)

oxygen gas is given off

b)

hydrogen gas is given off

c)

chlorine gas is given off

d)

hydrogen chloride gas is given off

25.

In which of the following arrangement are the ions arranged in decreasing order of ionic size

a)

F–, Na+, Mg2+, Al3+

b)

Na+, Mg2+, Al3+, F–

c)

Al3+, Na+, Mg2+, F–

d)

Al3+, Mg2+, Na+, F–

26.

The filter in a cigarette reduces the amount of nicotine inhaled by

a)

adsorption

b)

absorption

c)

burning

d)

evaporation

27.

If 25 cm3 of a saturated solution contains 0.02 moles of the solute, determines the solubility of the solute

a)

5.0×10−4 mol dm−3

b)

0.8 mol dm−3

c)

0.4 mol dm−3

d)

5.0×10−2 mol dm−3

28.

Biotechnology is applied in the following processes except

a)

baking of bread

b)

production of wine

c)

production of antibiotics

d)

manufacturing of soap

29.

The percentage by mass of water in NaCO3.10H2O is [Na2CO3.10H2O = 286, H2O = 18]

a)

68.4%

b)

62.9%

c)

9.7%

d)

6.3%

30.

Which of the following conditions are necessary for the preparation of alkanoates from alkanols and alkanoic acids

a)

Water and NaOH

b)

Conc.H2SO4 and heat

c)

NaOH and heat

d)

Water and aqueous HCl

31.

All of the following compounds are covalent except

a)

NO2

b)

SO3

c)

SO2

d)

KNO3

32.

A salt that could be prepared by double decomposition is

a)

sodium trioxocarbonate (IV)

b)

barium trioxonitrate (V)

c)

lead (II) trioxonitrate (V)

d)

silver chloride

33.

The IUPAC name of the compound CH3CHClCH2OH is

a)

chloropropanol

b)

1–chloropropan–1–ol

c)

2–chloropropan–3–ol

d)

2–chloropropan–1–ol

34.

Neutral atom of neon with atomic number 10 is isoelectronic with

a)

K+

b)

Mg2+

c)

Ca2+

d)

Li+

35.

Which of the following species is the most powerful reducing agent

a)

Bromine atom

b)

Chlorine atom

c)

Fluoride atom

d)

Iodine atom

36.

The electron configuration of element Y is 1s2s22p63s23p4. Y therefore

a)

has mass number of 16

b)

has three unpaired electrons

c)

belongs to period 4

d)

belongs to group VI

37.

Which of the following alkanols is tertiary

a)

2–methylpentan–2–ol

b)

2–methylpentan–1–ol

c)

pentan–3–ol

d)

pentan–2–ol

38.

Which of the following elements is commercially obtained by the electrolysis of its fused salt

a)

silver

b)

copper

c)

helium

d)

sodium

39.

The lustre of a metal is due to its

a)

high density

b)

refractive density

c)

chemical inertness

d)

free electrons

40.

Exothermic reactions takes place when energy given out in making bonds is

a)

less than energy in for breaking bonds

b)

greater than energy taken in for breaking bonds

c)

equal to the energy taken in for breaking bonds

d)

remains the same as the energy taken in

41.

Which of the following metals would not release hydrogen when reacted with dilute HCl

a)

calcium

b)

silver

c)

iron

d)

zinc

42.

Five d-orbitals having the same energy level in an isolated transition metal are described as

a)

degenerate

b)

non-degenerate

c)

high-level orbital

d)

low-level orbital

43.

Which of the following oxides in amphoteric

a)

CaO

b)

MgO

c)

BaO

d)

BeO

44.

The allotrope of carbon used in the decolorization of sugar is

a)

charcoal

b)

graphite

c)

lampblack

d)

soot

45.

In the period table, valence electrons are indicated by

a)

group number

b)

shell number

c)

period number

d)

atomic mass

46.

Nucleons are sub-atomic particles which consist of

a)

protons and neutrons

b)

neutrons and electrons

c)

protons and electrons

d)

neutrons, protons and electrons

47.

A few drops of sodium hydroxide is added to an aqueous solution, a green precipitate is formed. The ion that may be present in the solution is

a)

Cu2+

b)

Fe2+

c)

NH4+

d)

Fe3+

48.

When C2H4 molecule is polymerized, the polymer formed is

a)

polyethene

b)

polyethene

c)

polypropene

d)

polybutene

49.

When a hypothesis is proven within the limit of available evidence, it becomes a

a)

scope

b)

theory

c)

principle

d)

law

50.

Empirical formula is the

a)

A. simplest formula of a compound

b)

B. molecular of a compound

c)

C. chemical formula of a compound

d)

D. structural formula of a compound

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