Ruby and sapphire are oxides of
1). copper
2). tin
3). iron
4). aluminium
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2. Magnesium oxide (MgO) + Water $(H_{2}O)$ = ?
3. The first organic compound synthesised in the laboratory was
4. Which among the following is used as a catalyst in the production of high octane fuels?
5. The Chemical formula of Ammonium dichromate is _____.
6. When water itself combines chemically with some element or mineral it is called
7. German silver used for making utensils is an alloy of