Sodium Thiosulphate

Q. When $N{a}_2{S}_2{O}_3$ reacts with $I_2$ to form $N{a}_2{S}_4{O}_6$ and $NaI$ then which statement(s) is correct?

1. n-factor for $N{a}_2{S}_2{O}_3$ is one
2. n-factor for $I_2$ is two
3. n-factor for $N{a}_2{S}_4{O}_6$ is one
4. 2 moles of $N{a}_2{S}_2{O}_3$ is reacted with 1 mole of $I_2$

Q.

When strongly heated, Sodium thiosulphate disproportionates into compounds having ___ different oxidation states.

Q.

Sodium thiosulphate could be synthesized by

1. boiling aqueous NaOH with Sulphur

2. heating a solution of a Sodium sulphite with finely powdered S in an alkaline medium

3. Spring’s reaction

4. All of the above

Q.

When it is gently warmed, Sodium thiosulphate pentahydrate loses its water of crystallization. $N{a}_2{S}_2{O}_3.5H_{2}O$ is commonly called __.

Q.

The average oxidation state of Sulphur in Sodium Thiosulphate is +___.

Q. In which pair of ions both the species contain S - S bond?

1. $S_2{O}_7^{2-},S_2{O}_8^{2-}$
2. $S_4{O}_6^{2-},S_2{O}_7^{2-}$
3. $S_2{O}_7^{2-},S_2{O}_3^{2-}$
4. $S_4{O}_6^{2-},S_4{O}_3^{2-}$

Q. The difference in the oxidation number of two types of S-atoms in $N{a}_2{S}_4{O}_6$ is ___.

Q.

The reaction of sodium thiosulphate with $I_2$ produces:

1. Sodium sulphite

2. Sodium sulphate

3. Sodium iodide

4. Sodium tetrathionate

Q. Consider the following reaction sequence.
$N{a}_{2}S+N{a}_{2}S{O}_3+I_2\to A+NaI$
$A+I_2\to NaI+B$
If the molar mass of anhydrous form of $B$ is $X\left(gm/mole\right)$ and the number of sulphur atoms per molecule of $B$ is $Y$, then find the value of $X/Y$.

Q. When $N{a}_2{S}_2{O}_3$ reacts with $I_2$ to form $N{a}_2{S}_4{O}_6$ and $NaI$ then which statement(s) is correct?

1. n-factor for $N{a}_2{S}_2{O}_3$ is one
2. n-factor for $I_2$ is two
3. 2 moles of $N{a}_2{S}_2{O}_3$ is reacted with 1 mole of $I_2$
4. n-factor for $N{a}_2{S}_4{O}_6$ is one