Gk Questions with AnswersChemistry
DIRECTIONS : Chemistry Questions and Answers.
| 21. | _____ is used to prepare the fertilizer ammonium sulphate. |
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| 22. | Sulphur is used in the ____ of rubber. |
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| 23. | _____ is used in softening of hard water. |
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| 24. | Formaldehyde reacts with ____ to form urotropine. |
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| 25. | Most of the metals have ___ melting points. |
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