Give scientific reason : Milk is pasteurized at the beginning .
Give a scientific reasons: Tungestm metal is used to make a solenoid type coil in an electric bulb.
Give scientific reason on : Sewage should be released into rivers only after oxidation .
Name any two alloys of copper and Give its uses .
Give reason why sodium bicarbonate is used in bakeries.
Assertion (A): Zinc metal when placed in copper sulphate solution, zinc turns brown. Reason (R): Due to metal displacement reaction, copper sulphate reacts with zinc, Cu gets deposited over zinc and so it turns brown.
