Question

(5 Marks each
. Give reasons:
(a) Magnesium ribbon should be cleaned before burning in air.
(b) Photosynthesis is considered as an endothermic reaction.
(c) Combustion reaction is an oxidation reaction.
g Answer Type Questions
.(a) A student has been collecting silver coins and copper coins. After some da
when she took out the coins to count she observed a black coating on silver coin
and green coating on copper coins. Which chemical phenomenon is responsible
for such coatings? Write the chemical reactions involved.
(b) Name the gas that is used by manufacturers to fill the packets of chips to prever
them from getting oxidised.
Considered the chemical equation given below and answer the questions that follow
ZnO+C +Zn+CO
(a) Nare the substance which is getting oxidised.
(b) Name the substance which is getting reduced.
(c) Name the oxidising agent.​

Answer 1

Answer:

Explanation:

1) to remove the oxides layer

2)it takes energy from sun

3)because it involves gaining of electron and increasing oxidation number

4)corrosion

5)n2

1)oxidised c

2)reduced zno

3)zno