CLASS: X NCERT (CBSE)
SCIENCE
Chemical Reactions and Equations
Multiple Choice Questions
Question 1: Which among the following is not a physical change?
1. Melting of solids to liquids
2. Vaporisation of liquids to gases
3. Liquefaction of gases to liquids
4. Decay of matter
Answer: 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
Answer: 1
Question 3: Physical changes are _______.
1. temporary
2. permanent
3. irreversible
4. endothermic
Answer: 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
Answer: 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
Answer: 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
Answer: 3
Question 7: Which of the following is a physical change?
1. Solubility in water
2. Combustibility
3. Aerial oxidation
4. Reaction with water
Answer: 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
Answer: 4
Question 9: Which is the correct symbol for manganese?
1. M
2. Ma
3. Mn
4. Mg
Answer: 3
Question 10: The symbol H stands for ________of hydrogen.
1. one atom
2. one molecule
3. one ion
4. two atoms
Answer: 1
Question 11: The correct formula for nitrogen dioxide is __________.
1. NO
2. N2O
3. NO2
4. N2O5
Answer: 3
Question 12: The correct formula for ammonium sulphate is __________.
1. NH4SO4
2. (NH4)2SO4
3. (NH3)2SO4
4. (NH4)2(SO4)2
Answer: 2
Question 13: Which of the following is an incorrect formula?
1. NaCl2
2. BaSO4
3. H2CO3
4. P2O5
Answer: 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
Answer: 1
Question 15: The correctly balanced equation for
is _________.
1.
2.
3.
4.
Answer: 4
Question 16: The sign used to indicate a reversible reaction is _______.
1.
2.
3.
4.
Answer: 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
Answer: 1
Question 18: In the equation,
the substance undergoing oxidation is ________.
1. lead dioxide
2. hydrochloric acid
3. Hydrogen
4. lead chloride
Answer: 2
Question 19: is an example of ________.
1. neutralization reaction
2. redox reaction
3. double displacement reaction
4. decomposition reaction
Answer: 3
Question 20: In the reaction: the white precipitate seen is due to ______.
,
1. ZnCl2
2. BaSO4
3. BaCl2
4. ZnSO4
Answer: 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
Answer: 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
Answer: 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
Answer: 2
Question 24: Which of these metals do not corrode?
1. Lead
2. Copper
3. Platinum
4. Silver
Answer: 3
Question 25: The formula for rust is________.
1. CuO
2. Fe2O3.xH2O
3. Al2O3
4. AgS
Answer: 2
Question 26: The main cause of rancidity in foods is
1. Bacteria
2. Proteins
3. Antioxidants
4. Oxidation of the fatty acid molecule
Answer: 4
