A cloth strip dipped in onion juice is used for testing a liquid ‘X’. The liquid ‘X’ does not destroy the odour of onions. Also, the liquid ‘X’ turns blue litmus red.
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a rectangular concrete beam 100mm wide by 250mm deep spanning over 8m is prestressed by a straight cable carrying an effective prestressing force of 250 kn
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THE LIQUID 'X' IS HYDROCHLORIC ACID
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