Solder is an alloy of
1). lead zinc
2). copper lead
3). tin lead
4). sodium lead
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3. An example of major air pollutant is
4. The compounds formed when hydrogen combines with p-block elements are called
5. The chief constituent of vinegar is
6. Which one of the following is not a greenhouse gas
7. Which of the following metals causes ItaiItal disease
8. Which is the purest form of iron ?