Question
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.
  4. A is false, but R is true.
Assertion: Gold occurs in native state.
Reason: Gold is a reactive metal.

Answer

  1. A is true, but R is false.

Explanation:

Gold is a noble metal.

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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.
  4. A is false, but R is true.
Assertion: Metals in general have very high melting and boiling points.
Reason: Metals have the strongest chemical bonds, which are metallic in nature.
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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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Reason: Solution of a salt of weak base and strong acid is acidic.
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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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Reason: Chief raw materials for the manufacture of washing soda are NH3, NaCl and CaCO3.
In the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as.
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  2. If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
  3. If Assertion is true, but Reason is false.
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Assertion: On heating, gypsum gets converted into plaster of Paris.
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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: 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.
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:
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  3. A is true, but R is false.
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Assertion: ln a balanced chemical equation, total mass of the reactants is equal to the total mass of the products.
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Assertion (A) : While dissolving an acid or base in water, the acids must always be added slowly to water with constant stirring.
Reason (R) : Dissolving an acid on a base in water is a highly exothermic reaction.
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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.
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Assertion: Higher the H+ ion concentration, lower is the pH value.
Reason: The pH of a neutral solution = 7, that of a basic solution< 7 and that of an acidic solution> 7.
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: Bleaching powder reacts with dilute acids to evolve chlorine.
Reason: The chlorine liberated by the action of dilute acids on bleaching powder is called available chlorine.
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  3. A is true, but R is false.
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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.