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chemical reaction and equations 2

Total questions: 50

Worksheet time: 31mins

Name
Class
Date
1.

Which information is not conveyed by a balanced chemical equation?

a)

Physical states of reactants and products

b)

Symbols and formulae of all the substances involved in a particular reaction

c)

Number of atoms/molecules of the reactants and products formed

d)

Whether a particular reaction is actually feasible or not

2.

Chemically rust is

a)

hydrated ferrous oxide

b)

only ferric oxide

c)

hydrated ferric oxide

d)

none of these

3.

What is the molecular formula for barium chloride?

a)

BaCl2

b)

BaCl

c)

Ba2Cl

d)

BaCl3

4.

Reactions in which energy is absorbed are known as (a)   reactions.

5.

Oxidation is the loss of electrons from a substance.

a)

True

b)

False

6.

The reaction between nitrogen and hydrogen to give ammonia is an example of a combination reaction.

a)

True

b)

False

7.

Unbalanced reactions are also known as (a)  

8.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
9.
Element or compound?
H2O
a)
Element
b)
Compound
10.
Element or compound?
O2
a)
Element
b)
Compound
11.
How many aluminum atoms are in Al2(SO4)3?
a)
1
b)
2
c)
3
d)
4
12.
A chemical change is?
a)
a shoe lace cut in half
b)
doesn't change anything
c)
changes the look of an object
d)
change that results in the formation of new chemical substances
13.

What type of change is melting an ice cube?

a)

Physical change

b)

Mental change

c)

Chemical change

d)

Hyper change

14.
Which observation would most likely indicate that an exothermic reaction has occurred?
a)
a color change
b)
the production of gas bubbles
c)
an increase in temperature
d)
a decrease in temperature
15.
Which among the following is(are) double displacement reaction(s)?(i) Pb + CuCl2 → PbCl2 + Cu (ii) Na2SO4 + BaCl2 → BaSO4 + 2NaCl (iii) C + O2 → CO2 (iv) CH4 + 2O2 → CO2 + 2H2O
a)
(i) and (iv)
b)
(ii) only
c)
(i) and (ii)
d)
(iii) and (iv)
16.
Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?(i) Displacement reaction (ii) Precipitation reaction (iii) Combination reaction (iv) Double displacement reaction
a)
(a) (i) only
b)
(b) (ii) only
c)
(c) (iv) only
d)
(d) (ii) and (iv)
17.
Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is
a)
(a) 1:1
b)
(b) 2:1
c)
(c) 4:1
d)
(d) 1:2
18.

Some stale food gives a bad taste and bad smell because of:

a)

Heating

b)

Displacement

c)

Corrosion

d)

Rancidity

19.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
a)
balanced
b)
unbalanced
20.
How many hydrogens are in 4H2O?
a)
6
b)
8
c)
2
d)
4
21.
Which of the following symbols is not a correct indication of the phase of a substance in a reaction? 
a)
(s)=solid
b)
(g)=grams
c)
(l)=liquid
d)
(aq)= aqueous
22.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
23.
Why is the following chemical equation not balanced?
H2 + O2 --> H2O
a)
each side of the equation has a different number of oxygen atoms
b)
each side of the equation has a different number of hydrogen atoms
c)
each side has the same mass
24.

On passing CO₂ gas through the product formed by the reaction between CaO and H₂O, solution becomes which colour?

a)

black

b)

red

c)

pink

d)

white

25.

Which of the following behaviours is true about the solution obtained by mixing CaO with water?

a)

Amphoteric solution

b)

Basic solution

c)

Acidic solution

d)

Neutral solution

26.

Which of the following represents a combination reaction?

a)

Reaction of zinc metal with copper sulphate solution.

b)

Heating of lead nitrate.

c)

.Burning of magnesium in air.

d)

Reaction between silver nitrate and sodium chloride.

27.

While performing an activity in the lab, Meera exhaled air into a colourless solution taken in a test tube. Suddenly its colour turned to milky white. Which among the following is the colourless solution?

a)

Lime water

b)

Soda water

c)

Aqueous solution of NaOH

d)

Aqueous solution of NaCl

28.

An iron nail is placed in a solution of copper sulphate. The nail is taken out after 10 minutes. The nail will be found to be covered with:

a)

Brown deposit

b)

Black deposit

c)

White deposit

d)

Yellow deposit

29.

What happens when a piece of Cu is put into a solution of magnesium chloride?

a)

Cu displaces Mg.

b)

Chlorine gas is liberated

c)

No chemical reaction.

d)

Colour of the solution changes to light green.

30.

Which among the following element changes the color of the knife in this experiment?

a)

Oxygen

b)

Copper

c)

Sulphur

d)

Iron

31.

Hydrated ferrous sulphate is commonly known as ______.

a)

Blue vitriol

b)

Green vitrioll

c)

Yellow vitrio

d)

Brown vitriol

32.

The following picture shows the heating of lead nitrate. On heating two gases are evolved, one is colourless and the other is brown in colour. Which gases are they?

a)

Hydrogen and oxygen

b)

Oxygen and nitrous oxide

c)

Hydrogen and lead oxide

d)

Oxygen and nitrogen dioxide

33.

Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to

(i) the formation of silver by decomposition of silver chloride

(ii) sublimation of silver chloride

(iii) decomposition of chlorine gas from silver chloride

(iv) oxidation of silver chloride

a)

(a) (i) only

b)

(b) (i) and (iii)

c)

(c) (ii) and (iii)

d)

(d) (iv) only

34.

Which of the following is not a physical change?

a)

Boiling of water to give water vapour

b)

Melting of ice to give water

c)

Dissolution of salt in water

d)

Combustion of Liquefied Petroleum Gas (LPG)

35.

Which of the following gases can be used for storage of fresh sample of an oil for a long time?

a)

a) Carbon dioxide or oxygen

b)

b) Nitrogen or oxygen

c)

(c) Carbon dioxide or helium

d)

(d) Helium or nitrogen

36.

A substance which oxidises itself and reduces other is

known as -

a)

oxidising agent

b)

reducing agent

c)

both of these

d)

none of these

37.

A redox reaction is one in which-

a)

both the substance are reduced

b)

both the substance are oxidised

c)

an acid is neutralised by the base

d)

one substance is oxidised while the other is reduced

38.

A reddish brown coloured metal used in electric wires,

when powdered and heated strongly in an open China

dish, its colour turns black. When hydrogen gas is

passed over this black substances, it regain its original

colour. Based on this information, the metal and black

coloured substances are

a)

copper and copper nitrate

b)

silver and silver oxide

c)

copper and copper oxide

d)

aluminium and aluminium oxide

39.

True or False: Neutralization reaction is a type of Double Displacement Reaction.

a)

True

b)

False

40.

Hydrogen Peroxide/H2O2 is stored in .................... .

a)

Transparent Bottles or containers

b)

Translucent Bottles or containers

c)

Coloured Bottles or containers

41.

What type of chemical reactions sometimes take place when electricity is passed through water?

a)

Displacement

b)

Combination

c)

Decomposition

d)

Double displacement

42.

Silver when exposed to air attain a blackish layer on it. The black substance is ...................... .

a)

Silver Chloride

b)

Silver Oxide

c)

Silver Bromide

d)

Silver Sulphide

43.

One sign of a chemical change is the formation of a precipitate. A precipitate is formed

when________________________.

a)

two liquids react and a gas is produced

b)

a solid dissolves in a liquid

c)

one liquid dissolves in another

d)

two liquids react and a solid is formed

44.

Which of the following are decomposition reactions?

a)

4 only.

b)

2, 3, and 4.

c)

2 and 3.

d)

All are decomposition reactions.

45.

Which chemical equation (shown below) correctly represents the decomposition reaction that takes place when ammonia breaks down to form hydrogen gas and nitrogen gas?

a)

Reaction A

b)

Reaction B

c)

Reaction C

d)

Reaction D

46.

The Statue of Liberty is made of copper. Over time, the bright copper changes to green when the copper reacts with certain gases in the air. What sign of a chemical reaction have we observed?

a)

Warming or Cooling

b)

Formation of Bubbles

c)

Change in Color

d)

Formation of a Precipitate

47.

Which type of chemical reaction starts with one reactant?

a)

Combustion

b)

Synthesis

c)

Neutralization

d)

Decomposition

48.

The decomposition of water is called

a)

combustion

b)

electrolysis

c)

synthesis

d)

oxidation

49.

Find the molar mass of MgSO4

(Hint: Use the periodic table and add them) The timer is set for 15 minutes. You have lots of time.

a)

120 grams

b)

72 grams

c)

60 grams

d)

92 grams

50.

What type of equation is this?


2Na + Br2 → 2NaBr

a)

Addition

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

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