Which gas contributes most to the Greenhouse effect?
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Limestone is a raw material used by which industry?
The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 2nd group and the 4th period?
Which of the following elements has the lowest melting point?
Give an example of a salt which gives an aqueous solution of pH less than 7.
Which of the following is essential for the synthesis of thyroxin?
Which among the following metal is used for galvanization?
Which of the following is not a component of Smog?
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