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Gobar gas contains mainly ___.
Air is a/an...?
Which of the following is used in beauty parlours for hair setting?
The most malleable metal is ___.
Which of the following is a chemical change?
The hydrogenation of the vegetables oils takes place in the presence of finely divided ___.
In which of the following processes light energy is converted into chemical energy?
Photoelectric effect was discovered by?
Heavy water is....?
Which of the following is a physical change?
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