Question

Acidified solution of sodium thiosulphate is unstable because in thiosulphate

A. the sulphur atoms are at unstable oxidation state of +2
B. the two sulphur atoms are at different oxidation states of +6 and -2  
C. the $$S-S$$  bond are unstable bonds.
D. sulphur is in zero oxidation state.
Answer :   the two sulphur atoms are at different oxidation states of +6 and -2
Solution :
$$\mathop {N{a_2}{S_2}{O_3}}\limits_{{\text{(Disproportionation)}}} + 2HCl \to 2NaCl + S{O_2} + S + {H_2}O$$

Releted MCQ Question on
Inorganic Chemistry >> S - Block Elements

Releted Question 1

A substance absorbs $$C{O_2}$$  and voilently reacts with water. The substance is

A. $$CaC{O_3}$$
B. $$CaO$$
C. $${H_2}S{O_4}$$
D. $$ZnO$$
Releted Question 2

Calcium is obtained by

A. electrolysis of molten $$CaC{l_2}.$$
B. electrolysis of solution of $$CaC{l_2}$$  in water.
C. Reduction of $$CaC{l_2}$$  with carbon.
D. roasting of limestone.
Releted Question 3

A solution of sodium metal in liquid ammonia is strongly reducing due to the presence of

A. sodium atoms
B. sodium hydride
C. sodium amide
D. solvated electrons
Releted Question 4

The hydration energy of $$M{g^{ + + }}$$  is larger than that of :

A. $$A{l^{3 + }}$$
B. $$N{a^ + }$$
C. $$B{e^{ + + }}$$
D. $$M{g^{3 + }}$$

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S - Block Elements


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