Anil Ahlawat Solutions for Chapter: SOF National Science Olympiad, Exercise 3: ACHIEVERS SECTION

Observe the schematic atomic structures of three elements $P, Q$ and $R$:

Which of the following statements are correct?

I. $R$ can form $R{\mathrm{CI}}_3$ and $R{\mathrm{CI}}_5$.
Il. $Q$ exists in monatomic form.
Ill. $P$ and $R$ combine to form $P_{3}R$ type of compound.
IV. $P$ and $Q$ combine to form $P{Q}_2$ type of compound.
V. $P$ will gain two electrons to form a stable compound.

Two different fields $X$ and $Y$ were treated with two different substances to increase crop yield. Amount of humus in their respective fields was observed for a period of time as shown in the given graph.

Select the incorrect statement regarding substances applied in both fields $X$ and $Y$.

Identify $M-P$ in the given flow chart and select the correct statement regarding them.