Which among the following metals provides atmospheric oxide?
1). Sodium
2). Silver
3). Aluminium
4). Calcium
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1. Periodic table contains how many periods
2. The common name for the compound having formal NaOH is
4. Tear gas used by the police to disperse the mob contains
6. Impure camphor is purified by
7. Ruby and sapphire are oxides of
8. A change in which one or more new substances are formed is called _________.
9. Question 8.10:What are the different oxidation states exhibited by the lanthanoids?
10. Which one of the following group of gases contributes to the 'Green House Effect'?