Q11 of 37 Page 22

What is the difference between skeletal equation and balanced chemical equation? Give example.

The difference between skeletal equation and balanced chemical equation is as follows:



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9

A shiny brown coin made up of an element turned black on heating. What was the element of the coin and what is the black compound formed?

 10

Marble statues often slowly get corroded when kept in open for a long time. Give a suitable explanation.

 12

Complete the missing components/variables given as reactant and product in the following reactions:

(i) BaCl2 + 'X' → +BaSO4


(ii) Cu + AgNO3→ Cu(NO3)2 + 'Y'


(iii) CaCO3 CaO + CO2

13

What is redox reaction? Identify the substance oxidized and the substance reduced in the following reactions.

(i) CuO + H2→ Cu + H2O


(ii) MnO2 +4HCl → MnCl2 + Cl2+ 2H2O