CGPET 2018 Solved Paper

1. Zinc and its ion does not contain any unpaired electron, thus, does not show any colour in its compounds.
∴ It is a wrong statement.
2. K2Cr2O7+H2O2 gives K2CrO4 as follows:
2K2Cr2O7+H2O2→2K2CrO4 +H2O+Cr2O3+4[O]
Hence, statement is correct.
3. The higher oxidation states of Mn are acidic in nature and lower oxidation states are basic in nature e.g. Mn2O3. Thus, statement is incorrect.
4. Composition of nichrome is: Iron →21−25%
Chromium →14−18%
Nickel (Ni) → about 55% - 56%
rest 1% are other elements.
∴ Statement is wrong
∴ Hence, (b) is the correct answer.