answer-
ques no 4
ques no 5
ques no 6 and 7
Answers
Answer:
4:=>Rust preventive oil suppliers suggest you apply rust preventive oils by dipping, spray brush or circulation. In dipping a cotton waste is dipped in oil and rubbed over metal to prevent the corrosion. You can use hot dipping or cold dipping. Spraying is also one way to apply rust preventive oils.
6:=>Carbon dioxide (CO2) turns lime water milky due to the formation of insoluble calcium carbonate, CaCO3. Sulphur dioxide (SO2) also does the same, but slowly, as it reacts with calcium hydroxide to form insoluble calcium sulphite
7.=>If a strip of magnesium metal is placed in copper sulphate solution, the blue colour of copper sulphate disappears and the magnesium metal turns brown as the displaced copper is deposited on it. In the reactivity series, the position of magnesium is above that of copper. So it is more reactive than copper and it would displace copper from copper sulphate solution.
Answer:
001721
Explanation:
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