NEETChemistryd and f Block Elements
Which of the following are correct? (i) V ²⁺ liberates hydrogen from a dilute acid (ii) The earlier members of lanthanide series behave more like aluminium (iii) The 'silver' UK coins are made of Cu / Ni alloy (iv) The maximum oxidation state exhibited by Neptunium is +7
Options
- A(i) (iii) only
- B(ii) (iv) only
- C(i) (iii) (iv) only
- D(i) (ii) (iii) only
Correct answer
C. (i) (iii) (iv) only
Step-by-step solution
V ²⁺ is a strong reducing agent and liberates hydrogen from a dilute acid. Thus, (i) is correct. In chemical behaviour, the earlier members of the lanthanide series behave more like calcium. Thus, (ii) is incorrect. Silver UK coins = Cu + Ni alloy. Thus, (iii) is correct. Neptunium (Np) belongs to the actinides series and has the configuration 5 f ^4 6 ~d ^ 1 7 ~s ^2 because of which it can show a maximum of +7 oxidation state. Thus, (iv) is correct.