Which one of the following is used for dating very old objects of archaeological importance?
1). Phosphorus
2). Tritium
3). Radium
4). Carbon
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1. Sea water can be purified by the process of
2. The molecules of which gas have highest speed?
3. PVC is obtained by the polymerisation of
4. An example of replenshible energy source is
5. The gas used for artificial fruit ripening of green fruit is
6. Tear gas used by the police to disperse the mob contains
8. Name the source from which Aspirin is produced?
9. Wax used for making candle is chemically a mixture of
10. The manufacture of iron from iron ore involves the process of