Question

Consider the following statements and arrange them in the order of true/false as given in the codes.
S${}_1$ : Interstitial compounds have high melting points, higher than those of pure metals.
S${}_2$ : Permangnate titrations in presence of hydrochloric acid are unsatisfactory.
S${}_3$ : KMnO${}_4$ does not act as an oxidising agent in strong alkaline medium.
S${}_4$ : For 1${}^{st}$ transition series, the E${}^{\Theta }$ value for M${}^{2+}$/M indicate a decreasing tendency to form cation across the series.

• A. T T F T
• B. T F F T
• C. T F T T
• D. F F T F

Answer 1

Answer: (A)

T T F T

S1 : Interstitial compounds have high melting points, higher than those of pure metals due to strong interatomic forces.
S2 : Permangnate titrations in presence of hydrochloric acid are unsatisfactory because in that case hydrochloric acid is oxidised to chlorine.
S3 : In strong alkaline medium, it act as oxidising agent. The reaction occurs as: $Mn{O}_4^{-}+e^{-}\stackrel{O{H}^{-}}{\to }Mn{O}_4^{2-}$
S4 : For 1${}^{st}$ transition series, the E${}^{\Theta }$ value for $M^{2+}/M$ indicates a increasing tendency to form cation across the series as in $M^{2+}/M\left(E^{\Theta }/V\right)$, negative value decreases across the series.