Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of
Assertion (A).
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true
Q1. Assertion (A): Carbonic Acids is used in making soft drinks.
Reason (R): All mineral acids are corrosive.
Answer. (d)
Reason is true but Assertion is false.
Q2. Assertion (A): Lime Juice has a sour taste, while lime water is slightly bitter.
Reason (R): The bitter taste of lime water is due to dilution.
Answer .(a)
Both assertion and reason are true and reason is the correct Explanation of assertion
Q3. Assertion (A): Antacids are used to get rid of pain caused by indigestion.
Reason (R): Antacids neutralise the excess acid produced in the stomach.
Answer. (b)
both Assertion and Reason are true but Reason is not the correct explanation of Assertion
Q4. Assertion (A): Tooth decay starts when the pH of the mouth is lower than 5.5.
Reason (R) : Bee – Sting leaves an acid which causes pain and irritation.
Answer (b)
both Assertion and Reason are true but Reason is not the correct explanation of Assertion
Q5. Assertion (A): When pH of rain water is more than 7, it is called acid rain.
Reason (R) : When electricity is passed through an aqueous solutions of sodium chloride, it decomposes to form sodium carbonate
Answer . (c)
Assertion is true but Reason is false.
Q6. Assertion: Acetic acid does not act as an acid in benzene solution.
Reason: Benzene is non-polar.
Answer (a) Option1. Both assertion and reason are correct and reason is the correct Explanation of assertion
Q7. Assertion: Calcium oxide is a base but not an alkali.
Reason: Calcium oxide is insoluble in water.
Answer (a)
Both assertion and reason are correct and reason is the correct Explanation of assertion
Q8. Assertion: There is no change in the colour of litmus paper when brought in contact with distilled water.
Reason: Litmus Paper is used to find whether an solution is Acidic or Basic.
Answer (b)
Both assertion and reason are correct and reason is not the correct
Q9. Assertion: When bleaching power is left in the open, its colour changes from blue to white.
Reason: The change in colour as oxygen breaks away from the compound.
Answer(c)
Assertion is true, reason is false
10. Assertion: Sodium and Potassium is kept inside kerosene.
Reason: Sodium does not react with organic solvents like kerosene.
Answer (b)
Both assertion and reason are true and reason is not the correct Explanation of assertion
Q11. Assertion: Chemical reaction changes the physical and chemical state of a substance.
Reason: When electric current is passed through water (liquid), it decomposes to produce hydrogen and oxygen gases.
Answer(a) Both assertion and reason are true and reason is the correct Explanation of assertion
Q12. Assertion: In a balanced chemical equation, total mass of the each element towards reactant side= total mass of the same element towards product side.
Reason: Mass can neither be created nor destroyed during a chemical change.
Answer (c)
Assertion is true but reason is false
Q13. Assertion: When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.
Reason: The decomposition reaction takes place on application of heat, therefore, its and endothermic reaction.
Answer b)
Both assertion and reason are true but reason is not a correct explain the assertion.
Q14. Assertion: Chips manufacturers usually flush bags of chips with gas such as nitrogen to prevent the chips from getting oxidised.
Reason: This increase the taste of the chips and helps in their digestion.
Answer (c)
Assertion is true but Reason is false.
Q15. Assertion: Rusting of iron metal is the most common form of corrosion.
Reason: The effect of rusting of iron can be reversed if they are left open in sunlight.
Answer (c) assertion is true but reasoning is false
Q16. Assertion: Iron can be obtained from Fe2O3 by reduction with aluminium.
Reason: The process is known as thermite process.
Answer (a)
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
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