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Q. What is diamond?
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Q. The two metal ions that cause hardness to water are:
Q. When formaldehyde & potassium hydroxide are heated, we get
Q. Fats and oils become rancid because of ?
Q. What is the main constituent of ‘Gobar Gas’ (biogas) ?
Q. Which of the properties of the elements is a whole number ?
Q. Which of the following one of the following metals does not react with water to produce Hydrogen
Q. Which among the following coal contains 90 per cent of carbon?
Q. Rain water helps to increase the _________ to some extent.
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