8 Given the following reactions involving A, B, C and D I) C + B+-------> C+ + B II) A+ + D------> No reaction III) C+ + A-----> No reaction IV) D + B-------> D+ + B The correct arrangement of A, B, C, D in order of their decreasing ability as reducing agent

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A, B, C

D

C + B^{+} \to C^{+} + B

A^{+} + D \to

C^{+} + A \to

D + B^{+} \to D^{+} + B

A, B, C, D

H_{2} (g)

A^{n +}

\begin{matrix} M e t a l & I r o n (I I) s u l p h a t e & C o o p e r (I I) s u l p h a t e & Z i n c s u l p h a t e & S i l v e r n i t r a t e A . & N o r e a c t i o n & D i s p l a c e m e n t B . & D i s p l a c e m e n t & N o r e a c t i o n C . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & D i s p l a c e m e n t D . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n \end{matrix}

Match the following compounds with their molecular mass.

(i) ${SO}_{2}$ (ii) ${CO}_{2}$ (iii) ${NO}_{2}$ (iv) $H_{2} O$

(a) 44 u (b) 64 u (c) 18 u (d) 46 u

Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows.

Use the Table above to answer the following questions about metals A, B, C and D.

(i) Which is the most reactive metal?

(ii) What would you observe if B is added to a solution of copper (II) sulphate?

(iii) Arrange the metals A, B, C and D in the order of decreasing reactivity.

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