CBSE Class 10 Chemistry Chemical Reactions And Equations Worksheet Set C

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Assertion and Reason Type MCQs : 

Following questions consists of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
A. Both assertionand reason are true, and reason is the correct explanation of assertion.
B. Both assertion and reason are true, but reason is not the correct explanation of assertion.
C. Assertion is true but reason is false.
D. Assertion is false and reason is true.

Question. Assertion(A): The colour of salts does not depend on water of crystallisation.
Reason(R): Ferrous Sulphate crystals are blue in colour because of the seven water molecules of crystallisation.

Answer: D

Question. Assertion(A): Addition of oxygen is oxidation.
Reason(R): Removal of oxygen is reduction.

Answer: B

Question. Assertion(A): Silver Bromide is used in black and white photography.
Reason(R): Silver Bromide decomposes in the presence of sunlight.

Answer: B

Question. Assertion(A): Silver Chloride turns grey in sunlight.
Reason(R): This is an example of thermal decomposition.

Answer: C

Question. Assertion(A): Reaction between Barium Hydroxide and Ammonium Chloride makes the test tube cool to touch.
Reason(R): It is an example of endothermic reaction.

Answer: A

Question. Assertion(A): The surface of copper powder becomes black on heating.
Reason: Black colour copper oxide is formed.

Answer: A

Question. Assertion(A): Brown fumes are obtained from the thermal decomposition of Lead Nitrate.
Reason(R): Nitrogen dioxide gas is released which is brown in colour.

Answer: A

Question. Assertion(A): Decomposition of Calcium Carbonate is a type of chemical reaction.
Reason(R): Chemical reactions involve the breaking and making of bonds to produce new substances.

Answer: A

Question. Assertion(A): Fatty foods taste the same even after long periods of exposure to air.
Reason(R): We should store oily foods in air tight containers.

Answer: D

CASE BASED MCQs

I. Clean a magnesium ribbon about 2 cm long by rubbing it with sandpaper. Hold it with a pair of tongs. Burn it using a spirit lamp or burner and collect the ash so formed in a watch-glass. 

Question. What is the chemical name of the powder obtained in the activity?
A. magnesium carbonate
B. magnesium oxide
C. magnesium sulphide
D. magnesium chloride

Answer: B

Question. Which compound is formed when the powder obtained reacts with water?
A. Magnesium sulphate
B. Magnesium oxide
C. Magnesium carbonate
D. Magnesium hydroxide

Answer: D

Question. Magnesium ribbon is rubbed before burning because it has a coating of
A. basic magnesium carbonate
B. basic magnesium oxide
C. basic magnesium sulphide
D. basic magnesium chloride

Answer: A

Question. What is the colour of magnesium ribbon?
A. White
B. Black
C. Grey
D. Yellow

Answer: C

II. Take a plastic mug, drill two holes at its base and insert carbon electrodes. Connect these electrodes to a 6 volt battery. Fill the mug with water such that the electrodes are
immersed. Add a few drops of dilute sulphuric acid to the water. Take two test tubes 

filled with water and invert them over the two carbon electrodes. Switch on the current and leave the apparatus undisturbed for some time.

Question. Where is hydrogen gas collected?
A. Anode
B. Cathode
C. At both electrodes
D. Hydrogen gas is not evolved in this activity

Answer: B

Question. Which of the following is an endothermic process?
A. Dilution of sulphuric acid
B. Condensation of water vapours
C. Respiration in human beings
D. Electrolysis

Answer: D

Question. What is the ratio in which hydrogen and oxygen are present in water by volume?
A. 1:2
B. 1:1
C. 2:1
D. 1:8

Answer: C

Question. Which electrodes are used in this activity?
A. Graphite
B. Diamond
C. Copper
D. Coke

Answer: A

III. Take about 2 g ferrous sulphate crystals in a dry boiling tube. Heat the boiling tube over the flame of a burner or spirit lamp. In this reaction you can observe that a single reactant breaks down to give simpler products. This is a decomposition reaction.
Ferrous sulphate crystals (FeSO₄, 7H₂O) lose water when heated and the colour of the crystals changes. It then decomposes to ferric oxide (Fe₂O₃), sulphur dioxide (SO₂) and sulphur trioxide (SO₃). Ferric oxide is a solid, while SO2 and SO3 are gases. 

Question. What compound is formed when sulphur dioxide is passed through water?
A. Sulphuric acid
C. Hydrogen Sulphide
B. Sulphurous acid
D. Sulphur trioxide

Answer: C

Question. What can we observe in this activity?
A. Water vapor is evolved
B. Change in colour
C. Smell of burning sulphur
D. All of the above.

Answer: D

Question. What is the colour of iron oxide?
A. Brown
C. Yellow
B. Grey
D. White

Answer: A

Please click the below link to access CBSE Class 10 Chemistry Chemical Reactions And Equations Worksheet Set C