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1.having changed his clothes, he went for a walk.
2.she didn't give an answer to my calls
3.you must work hard to succeed.
4.he was set free and was provided with some money.
5.he couldn't go to school due to his illness.
6.inspite of being poor she doesn't complain.
7. having finished their homework, they went to play.
8.inspite of the ship went down, the passengers were saved.
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Dihydrogen is prepared in the laboratory by the reaction of zinc with either dilute sulphuric acid or hydrogen chloride. In both the reactions zinc is oxidized. Zinc sulphate is formed and dihydrogen is produced.
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