The mass number of a nucleus is.
1). always less than its atomic number
2). always more than its atomic number
3). always equal to its atomic number
4). sometimes more and sometimes equal to its atomic number
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1. The BOD values of water indicate the
2. The acid present in red ants is
3. Cement containing excess amount of lime
4. The term 'brown air' is used for
5. If water smells bad, then that odour can be removed by adding
6. What is the chemical name for Baking Soda
7. Which of the following is used for refrigeration?
8. Pasteurization is the process in which milk is heated to
9. Which one of the following is used for dating very old objects of archaeological importance