Question
For question two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
  1. Both A and R are true, and R is correct explanation of the assertion.
  2. Both A and R are true, but R is not the correct explanation of the assertion.
  3. A is true, but R is false.
  4. A is false, but R is true.
Assertion: CH3COOH is used as vinegar in cooking and food preservatives.
Reason: Strong acids are those acids which ionise almost completely in aqueous solution and hence produce a large amount of H+ ions.

Answer

  1. Both A and R are true, but R is not the correct explanation of the assertion.

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Assertion (A): Tap water conducts electricity but distill water does not conducts electricity.
Reason (R): Tap water conducts electricity as it contains ions whereas distilled water does not contain ions.
For two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:

  1. Both A and R are true, and R is correct explanation of the assertion.
  2. Both A and R are true, but R is not the correct explanation of the assertion.
  3. A is true, but R is false.
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Assertion: Magnesium ribbon keeps on burning in atmosphere of nitrogen.

Reason: Magnesium reacts with nitrogen to form magnesium nitride and this reaction is combination reaction.

Assertion (A) : Hydrogen peroxide is kept in coloured bottles.
Reason (R) : Hydrogen peroxide is a moderately reactive metal that can react with light or heat slowly to produce water.
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  2. Both A and R are true, but R is not the correct explanation of the assertion.
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  4. A is false, but R is true.
Assertion: Acetic acid does not act as an acid in benzene solution.
Reason: Benzene is non-polar.
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  2. Both A and R are true, but R is not the correct explanation of the assertion.
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  4. A is false, but R is true.
Assertion: Baking soda is prepared by chlor-alkali process.
Reason: Brine decomposes to sodium hydroxide on passing electricity through it.
For question two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
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  2. Both A and R are true, but R is not the correct explanation of the assertion.
  3. A is true, but R is false.
  4. A is false, but R is true.
Assertion: Tooth decay starts when the pH of the mouth is lower than 5.5.
Reason: Enamel starts corroding below 5.5 pH.
For question two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
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  2. Both A and R are true, but R is not the correct explanation of the assertion.
  3. A is true, but R is false.
  4. A is false, but R is true.
Assertion: The process of dissolving an acid or a base in water is highly exothermic reaction.
Reason: Water must always be added slowly to acid with constant stirring.
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  3. A is true, but R is false.
  4. A is false, but R is true.
Assertion: Iron is the most widely used metal. But it is never used in its pure state.
Reason: Pure iron is very soft and stretches easily when hot.
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Assertion: Graphite is a good conductor of electricity.

Reason: lt has one free valence electron.
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  2. Both A and R are true, but R is not the correct explanation of the assertion.
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Assertion: The chemical name of bleaching powder is calcium oxychloride.
Reason: Bleaching powder is used as an oxidising agent in chemical industries.