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Class-X CHEM-1

Total questions: 40

Worksheet time: 20mins

Name
Class
Date
1.

Which of the following statements is not true when zinc powder is added to dilute hydrochloric acid?

a)

Zinc is oxidised

b)

Chloride ion acts as an oxidising agent

c)

Hydrogen ion is reduced

d)

Electrons are transferred in the reaction

2.

Which process involves the transfer of electrons?

a)

double replacement

b)

neutralization

c)

oxidation-reduction

d)

sublimation

3.

During which process does an atom gain one or more electrons?

a)

transmutation

b)

reduction

c)

oxidation

d)

neutralization

4.

When a lithium atom forms an Li+ ion, the lithium atom

a)

gains a proton

b)

gains an electron

c)

loses a proton

d)

loses an electron

5.
Another name for a "oxidation-reduction" reaction is
a)
chemical reaction
b)
neutralization reaction
c)
redox reaction
d)
nuclear reaction
6.
Which of the following is evidence that a chemical change has taken place? 
a)
change in color
b)
change in size
c)
change in shape
d)
change in energy
7.
How many oxygen atoms are present in the following? 
4Ca(OH)2
a)
4
b)
6
c)
8
d)
1
8.

Why must we balance chemical equations?

a)

Our teacher said so

b)

to abide by the law of conservation of energy

c)

to abide by the law of conservation of mass

d)

to make volume of reactants and products equal

9.
Which of the following is true? 
a)
Na is a gas
b)
Cl combusts when put in water
c)
NaCl is very different than Na and Cl
d)
Cl is a metal
10.
How many E atoms are there in this silly formula?
2E2Fg3Hi4
a)
4
b)
2
c)
1
d)
3
11.
 Fill in the blank to balance the chemical equation. 
2KI  +  ____Cl2 →  2KCl  +  I2
a)
1
b)
2
c)
3
d)
4
12.

What coefficient should go in the blank space to balance the chemical equation?

2Al +____ HCl → 2AlCl3 + 3H2

a)

2

b)

4

c)

3

d)

6

13.
CaCO3 represents a chemical
a)
Symbol
b)
Formula
c)
Subscript
d)
Reaction
14.
How many Mn atoms are found in the following compound?
3Cr(MnO4)6
a)
3
b)
4
c)
6
d)
18
15.
Which of the following is the precipitate in the following double replacement reaction?
KBr(aq) + AgNO3(aq) → KNO3(aq) + AgBr(s)
a)
AgNO3
b)
KNO3
c)
KBr
d)
AgBr
16.
What are the products of mixing silver with potassium nitrate?
a)
AgKNO3
b)
No Reaction
c)
AgNO3
d)
AgK + NO3
17.
What would the product(s) be if calcium is mixed with oxygen gas?
a)
CaO
b)
Ca2O2
c)
Ca + O2
d)
CaO2
18.

A chemical reaction in which a compound is broken down into two or more smaller substances.

a)

Addition

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

19.

A chemical reaction in which ions from TWO compounds in solution exchanges places to produce two new compounds

a)

Addition

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

20.

What type of equation is this?


H2O + Fe → Fe2O3 + H2

a)

Addition

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

21.
Balance this equation, Ca + H2O --> CaO + H2
a)
Ca + 2H2O --> CaO + 2H2
b)
2Ca + H2O --> CaO + H2
c)
Its balanced as it is
d)
Cannot be balanced
22.
Which species is being reduced?
2Al + 3CuO → Al2O3 + 3Cu
a)
Al
b)
Cu
c)
O
d)
None of the above
23.

Which gas is evolving ?

a)

H2

b)

O2

c)

CO2

d)

SO2

24.

Which type of reaction will occur?

a)

Combination Reaction

b)

Decomposition Reaction

c)

Double Decomposition reaction

d)

Photo Chemical reaction

25.

Fill in the gap

a)

Fe2O3 (s)

b)

FeO (s)

c)

Fe3O4 (s)

d)

FeS (s)

26.

Identify the brown gas

a)

NO2

b)

N2O

c)

N2O4

d)

SO2

27.

Identify the gases

a)

Gas-A is oxygen and Gas-B is Hydrogen

b)

Gas-B is oxygen and Gas-A is Hydrogen

c)

Gas-A is oxygen and Gas-B is NITROGEN

d)

Gas-A and Gas-B both are water vapour

28.

Substance used in photographic film

a)

silver halide

b)

AgNO3

c)

Ag

d)

Cu

29.

This is corrosion of

a)

Cu

b)

Fe

c)

Ag

d)

Al

30.

Rancidity is mainly due to

a)

oxidation & hydrolysis

b)

reduction

c)

neutralization

d)

decomposition

31.

BHA & BHT are examples of

a)

oxidants

b)

antioxidants

c)

acids

d)

catalysts

32.

In the following which one is the least reactive?

a)

Cu

b)

Fe

c)

Na

d)

Ag

33.

Photosynthesis is a

a)

redox reaction

b)

oxidation

c)

reduction

d)

decomposition

34.

This is the precipitation of

a)

BaSO4

b)

AgCl

c)

CaCO3

d)

PbI2

35.

Which of the following is the FeSO4 solution?

a)
b)
c)
d)
36.
a)

(a)

b)

(b)

c)

(c)

d)

(d)

37.

a)

A

b)

B

c)

C

d)

D

38.

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

a)

2:1

b)

1:2

c)

1:1

d)

4:1

39.

Chemically rust is

a)

hydrated ferrous oxide

b)

only ferric oxide

c)

hydrated ferric oxide

d)

none of these

40.

Tarnished silver is due to the formation of

a)

silver sulfide

b)

silver oxide

c)

silver nitrate

d)

silver chloride

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