Which of the following metals reacts vigorously with cold water?
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Which term describes an enzyme?
Which of the following metals is found in free state?
Which of the following is not a constituent of biogas?
What is the process of slow cooling of hot glass called?
Which of the following is not correct with reference to Bio-sand Water Filter?
Nitrogen fixation is a process of
Which of the below options is called a laughing gas?