Question

5. Pammi added some sodium hydroxide to a test tube containing dilute hydrochloric acid. Which of the following observations are correct? (1) The temperature of the test tube increases (i) A salt is formed (1) The temperature of the test tube decreases (iv) Water is formed (a) (i) and (iv) (b) (i) and (1) (c) (i) and (61) (d) (i), (ii) and (iv)​

Answer 1

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A ) Silver metal does not react with dilute HCI because silver lies low in the reactivity series of metal .

B ) The temperature of the react mixture rises when aluminium is added because it is an exothermic reaction .

C ) The reaction of sodium metal is found to be highly explosive because sodium is highly reactive Thus resulting in an exothermic reaction which leads to an increase in temperature .

D ) When lead is treated with hydrochloric acid , bubbles of hydrogen gas are evolved .

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