Processing math: 100%




<<345678>>
26.

The maximum number of electrons that can have principal quantum number, n = 3 and spin quantum number  ms=12 , is


A) 9

B) 5

C) 8

D) 7



27.

When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. The addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH3 dissolves O and gives an intense blue solution

The final solution contains


A) [Pb(NH3)4]2+ and [CoCl4]2

B) [Al(NH3)4]3+ and [cu(NH3)4]2+

C) [Ag(NH3)2]+ and [Co(NH3)4]2+

D) [Ag(NH3)2]+ and (Ni(NH3)6]2+



28.

When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. The addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH3 dissolves O and gives an intense blue solution

 The compound  N is 


A) AgNO3

B) Zn(NO3)2

C) Al(NO3)3

D) pb(NO3)2



29.

When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. The addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH3 dissolves O and gives an intense blue solution

The metal rod M is


A) Fe

B) Cu

C) Ni

D) Co



30.

Extraction of metal from the ore cassiterite involves


A) carbon reduction of an oxide ore

B) self-reduction of a sulphide ore

C) removal of copper impurity

D) removal of iron impurity



<<345678>>