Select the correct statement from the following
Select the correct statement from the following
- A
A mere $0.1\;\%$ impurities cannot make domestic sewage unfit for human use
- B
High concentrations of $DDT$ disturb calcium metabolism in birds.
- C
Phaeophytization in lichens is caused due to nitrogen oxides
- D
‘Bad’ ozone as well as ‘good’ ozone both are found in the upper part of the atmosphere.
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The atomic numbers of elements $A$,$B$,$C$ and $D$ are $Z-1$,$Z$,$Z+1$ and $Z+2$,respectively. If $B$ is a noble gas,choose the correct statements from the following:
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