11th Class Chemistry The s-Block Elements

  • question_answer 81)   In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question. Assertion (A): The carbonate of lithium decomposes easily on heating to form lithium oxide and\[C{{O}_{2}}\]. Reason (R): Lithium being very small in size polarises large carbonate ion leading to the formation of more stable\[L{{i}_{2}}O\]and \[C{{O}_{2}}\] (a) Both A and R are correct and R is the correct explanation of A. (b) Both A and R are correct and R is not the correct explanation of A. (c) Both A and R are not correct. (d) A is not correct but R is correct.

    Answer:

      (a) Unlike other alkali metal carbonates; the carbonate of lithium decomposes on heating to form its oxide. Its oxide is stablised by polarisation.

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