Among ionic species, `Sc^(3+), Ce^(4+)` and `Eu^(2+)`, which one is a good oxidising agent? Give a suitable reason for your answer. (Atomic nos: Sc = 21, Ce=58, Eu=63).

of the ions Co^(2+), Sc^(3+) and Cr^(3+) which one will give coloured aqueous solutions and how will each of them respond a magnetic field and why ? ( Atomic numbers : Co, = 27, Sc= 21 ,Cr = 24)

Which of the following has maximum bond angle ? H_(2)O,NH_(3),CO_(2),CH_(4) Give suitable explanation for your answer.

Let A = {2, 3, 5, 8} and B = {4, 27, 125, 512}, then which of the following are relations from A to B ? Give reasons for your answer. (i) R_(1) = {(2, 4), (3, 125), (8, 512)} (ii) R_(2) = {(2, 125), (512, 8), (3, 27)} (iii) R_(3) = {(2, 512), (3, 125), ( 4,3)} (iv) R_(4) = {(2, 512), (3, 125), (3, 4)}

Why Eu^(2+) and Yb^(2+) ions in solutions are good reducing agents but an aqueous solution of Ce^(4+) is a good oxidising agent?

If A={1,2,3,4},B={5,6,7,8} , then which of the following are relations from A to B? Give reasons for your answer. R_(1)={(1,5),(2,7),(3,8)}

If A = {3, 5, 7, 9} and B = {a, b, c}, then which of the following are relations from A to B ? Give reasons for your answer. (i) R_(1) = {(3, a), (5, b), (5, c)} (ii) R_(2) = {(3, c), (9, b), (5, a)} (iii) R_(3) = {(3, c), (b, c), (7, b), (9, a)} (iv) R_(4) = {(3, b), (7, c), (c, a), (b, 9)}

Which of the following lanthanoid ions is diamagnetic? (Atomic number of Ce=58,Sm=62,Eu=63,Yb=70 ]

Among the following ,what is the total number of speices which are very good oxidising agents/reducing agents/neither oxidising nor reducing ones ? a. F_(2) b. F^(ө) c. Na d. Na^(o+) e. MnO_(4)^(ө) f. I^(ө) Cl^(ө) h. Ce^(4+) i. Cr_(2)O_(7)^(2-) j. CrO_(4)^(2-) k. HNO_(3) l. Fe^(2+)

If A={1,2,3,4},B={5,6,7,8} , then which of the following are relations from A to B? Give reasons for your answer. R_(2)={(6,2),(3,7),(4,7)}

(a) Following are the transition metal ions of 3d series: Ti^(4+),V^(2+),Mn^(3+),Cr^(3+) (Atomic numbers: Ti=22,V=23,Mn=25,Cr=24 ) Answer the following: (i) Which ion is most stable in an aqueous solution and why? (ii) Which ion is a strong oxidising agent and why? (iii) Which ion is colourless and why? (b) Complete the following equations: (i) 2MnO_(4)^(-)+16H^(+)+5S^(-)to (ii) KMnO_(4)overset(heat)to