Sodium Thiosulphate

Q. Maximum oxidation state (+8) is exhibited by

1. Cl and I
2. Co and Ni
3. Ru and Os
4. Te and I

Q.

Oxidation number of iodine in IO₃^-, IO₄^-, KI and I₂ respectively is:

1. -2, -5, -1 , 0

2. +5, +7, -1, 0

3. +2, +5, +1, 0

4. -1, +1, 0, +1

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.

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

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

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> NEET 2017

Q. $I_2$ reacts with sodium hydroxide to form colourless product

1. True

2. False

Q. Bleaching powder and bleach solution are produced on a large scale and used in several household products. The effectiveness of bleach solution is often measured by iodometry.

25 mL of household bleach solution was mixed with 30 mL of 0.50 M KI and 10 mL of 4N acetic acid. In the titration of the liberated iodine, 48 mL of 0.25 N $N{a}_2{S}_2{O}_3$ was used to reach the end point. The molarity of the household bleach solution is

1. 0.48 M
2. 0.96 M
3. 0.24 M
4. 0.024 M

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