| Question (1):
Which among the following is not a physical change?
|
| 1. |
Melting of solids to liquids
|
| 2. |
Vaporisation of liquids to gases
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| 3. |
Liquefaction of gases to liquids
|
| 4. |
Decay of matter
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|
| Ans: 4 |
|
| Question (2):
Which among the following is not a chemical change?
|
| 1. |
Melting of ice
|
| 2. |
Carbon cycle
|
| 3. |
Dehydration of substances
|
| 4. |
Fermentation of substances
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|
| Ans: 1 |
|
| Question (3):
Physical changes are _______.
|
| 1. |
temporary
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| 2. |
permanent
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| 3. |
irreversible
|
| 4. |
endothermic
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|
| Ans: 1 |
|
| Question (4):
An example of a chemical change is _____.
|
| 1. |
formation of clouds
|
| 2. |
glowing of an electric light
|
| 3. |
dropping sodium into water
|
| 4. |
dissolving of salt in water
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|
| Ans: 3 |
|
| Question (5):
Which of these will cause a chemical change to occur?
|
| 1. |
Grinding of wheat into flour
|
| 2. |
Lighting of a gas stove
|
| 3. |
Evaporation of water from a lake
|
| 4. |
Ringing of an electric bell
|
|
| Ans: 2 |
|
| Question (6):
Chemical changes are __________.
|
| 1. |
temporary, reversible and a new substance is produced
|
| 2. |
always accompanied by exchange of light
|
| 3. |
permanent, irreversible and a new substance is produced
|
| 4. |
never accompanied by exchange of light and heat energy
|
|
| Ans: 3 |
|
| Question (7):
Which of the following is a physical change?
|
| 1. |
Solubility in water
|
| 2. |
Combustibility
|
| 3. |
Aerial oxidation
|
| 4. |
Reaction with water
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|
| Ans: 1 |
|
| Question (8):
Which of the following information is conveyed by a chemical reaction?
|
| 1. |
The colour changes taking place
|
| 2. |
The structure of the reactants and products
|
| 3. |
The absorption of energy only
|
| 4. |
The masses of the reactants and products involved in the reaction
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|
| Ans: 4 |
|
| Question (9):
Which is the correct symbol for manganese?
|
|
|
| Ans: 3 |
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| Question (10):
The symbol H stands for ________of hydrogen.
|
| 1. |
one atom
|
| 2. |
one molecule
|
| 3. |
one ion
|
| 4. |
two atoms
|
|
| Ans: 1 |
|
| Question (11):
The correct formula for nitrogen dioxide is __________.
|
| 1. |
NO
|
| 2. |
N2O
|
| 3. |
NO2 |
| 4. |
N2O5 |
|
| Ans: 3 |
|
| Question (12):
The correct formula for ammonium sulphate is __________.
|
| 1. |
NH4SO4
|
| 2. |
(NH4)2SO4
|
| 3. |
(NH3)2SO4 |
| 4. |
(NH4)2(SO4)2 |
|
| Ans: 2 |
|
| Question (13):
Which of the following is an incorrect formula?
|
| 1. |
NaCl2
|
| 2. |
BaSO4
|
| 3. |
H2CO3 |
| 4. |
P2O5 |
|
| Ans: 1 |
|
| Question (14):
In one molecule of ammonium sulphide there are ___________.
|
| 1. |
2 atoms of N, 8 atoms of H, and 1 atom of S
|
| 2. |
1 atom of N, 4 atoms of H, and 1 atom of S
|
| 3. |
1 atom of N, 4 atoms of H, and 2 atoms of S
|
| 4. |
2 atoms of N, 8 atoms of H, and 2 atoms of S
|
|
| Ans: 1 |
|
Question (15):
The correctly balanced equation for
 is _________.
|
|
|
| Ans: 4 |
|
| Question (16):
The sign used to indicate a reversible reaction is _______.
|
|
|
| Ans: 4 |
|
| Question (17):
Breaking of lead bromide into lead and bromine is an example of __________.
|
| 1. |
decomposition reaction
|
| 2. |
synthesis reaction
|
| 3. |
displacement reaction
|
| 4. |
neutralisation reaction
|
|
| Ans: 1 |
|
Question (18):
In the equation
 , the substance undergoing oxidation is ________.
|
| 1. |
lead dioxide
|
| 2. |
hydrochloric acid
|
| 3. |
hydrogen
|
| 4. |
lead chloride
|
|
| Ans: 2 |
|
Question (19):
 is an example of ________.
|
| 1. |
neutralization reaction
|
| 2. |
redox reaction
|
| 3. |
double displacement reaction
|
| 4. |
decomposition reaction
|
|
| Ans: 3 |
|
Question (20):
In the reaction:
 , the white precipitate seen is due to ______.
|
| 1. |
ZnCl2
|
| 2. |
BaSO4
|
| 3. |
BaCl2 |
| 4. |
ZnSO4 |
|
| Ans: 2 |
|
| Question (21):
A white solid which is yellow when hot but changes to white again on cooling is _____.
|
| 1. |
PbO
|
| 2. |
CaO
|
| 3. |
Ag2O
|
| 4. |
ZnO
|
|
| Ans: 4 |
|
| Question (22):
From the given list, the nitrate which gives metal, NO2 and O2 on heating is _______.
|
| 1. |
NH4NO3
|
| 2. |
NaNO3
|
| 3. |
AgNO3 |
| 4. |
Cu(NO3)2 |
|
| Ans: 3 |
|
| Question (23):
The products of a burning candle are ________.
|
| 1. |
ash and water vapour
|
| 2. |
CO2 and water vapour
|
| 3. |
wax and water vapour
|
| 4. |
only melted wax
|
|
| Ans: 2 |
|
| Question (24):
Which of these metals do not corrode?
|
| 1. |
Lead
|
| 2. |
Copper
|
| 3. |
Platinum
|
| 4. |
Silver
|
|
| Ans: 3 |
|
| Question (25):
The formula for rust is________.
|
| 1. |
CuO
|
| 2. |
Fe2O3.xH2O
|
| 3. |
Al2O3 |
| 4. |
AgS
|
|
| Ans: 2 |
|
| Question (26):
The main cause of rancidity in foods is
|
| 1. |
Bacteria
|
| 2. |
Proteins
|
| 3. |
Antioxidants
|
| 4. |
Oxidation of the fatty acid molecule
|
|
| Ans: 4 |
|
