PART - 1 CH - 3 Metals and Non-Metals — Science STD 10 — Question

State the uses of ethanol.

State the ions responsible for acidic and basic behaviour. Explain the acidic and basic behaviour by reaction with water.

Explain in brief : Biomagnification

How is the extraction of metals at the top of reactivity series carried out? Explain with an example.

Explain Bishnois community as a stake for conservation of forests.

Ramesh's father is a farmer and he is disappointed as he cannot grow any crop on his farmland, because the land has become highly basic in nature. It happens due to paper industry nearby dumping its waste water into canals; that supply water to the farmland.
Ramesh and other youth in the village told the owner of the paper industry about the pollution caused by the paper industry.
(1) What type of land is suitable for the growth of crops?
(2) Use of fertilizers also causes change in the pH of soil. How do farmers overcome this problem?
(3) What values of Ramesh are reflected in the above case?

Explain food chain and trophic levels.

Naman saw his friend riding a cycle which was completely rusted at the edge of the pedal. He advised his friend to weld it and apply a coating of oil paint over it.
(1) Why do iron rust?
(2) Give two remedies to avoid rusting.
(3) What value of Naman is seen in the above act?

Mention the type of reactions involving burning of coal and formation of water. Write equation for the reactions.

What is meant by Dobereiner’s triads? Explain.