Give the correct order of initials T or F for the following statements. Use T if the statement is true and F if it is false. (I) Sulphide ions reacts with Na₂ [Fe(CN)₅(NO)] to form a purple-coloured compound Na₄ [Fe(CN)₅ (NOS)]. In the reaction, the oxidation state of iron changes. (II) Pt (IV) compounds are relatively more stable than Ni (IV) compounds (III) The welding of magnesium can be done in the atmosphere of Helium (IV) LiAlH₄ on hydrolysis will give H₂

(I) Sulphide ions reacts with Na₂[Fe(CN)₅(NO)] to form a purple-coloured compound which is Na₄[Fe(CNS)₅(NO)] not Na₄[Fe(CN)₅(NOS)]. This makes the statement false. (II) Ni has smaller size than Pt since Pt lies below Ni in the group. This means that the ionization energy of Ni will be higher for Ni compared to Pt. A higher I.E. value means it will be harder to remove an electron. So, Ni+4 compounds will be less stable than Pt+4 compounds which makes the statement true. (III) Welding is done in an inert atmosphere and Helium is an inert gas. Thus this statement is factual and it is true. (IV) 4