(a). The addition of NaOH solution to a solution of zinc chloride prod – InterviewSolution

InterviewSolution

1.	(a). The addition of NaOH solution to a solution of zinc chloride produces a white precipitate which dissolves on further addition of NaOH. (b). The addition of `NH_4OH` to `ZnSO_4` solution produces white precipitate but no precipitate is formed if it contains `NH_4Cl`.
Answer» First a white precipitate of `Zn(OH)_2` is formed which on further addition of NaOH forms soluble zincate `NaZnO_2`. (b). `NH_4OH` is a weak hydroxide. It is ionised slightly furnishing `OH^(ɵ)` ions which are sufficient to precipitate `Zn(OH)_2` because its low solubility product. However, in presence of `NH_4Cl`, the ionisation of `NH_4OH` is further suppressed and sufficient `OH^(ɵ)` are not available to cause precipitation.

Discussion

No Comment Found

Related InterviewSolutions

Lanthanide series start from the elements with atomic numberA. 27 to 71B. 58 to 71C. 56 to 70D. 60 to 74
The correct order of ionic radii of `Y^(3+), La ^(3+), Eu ^(3+) and Lu ^(3+)` isA. `Y^(3+) lt Lu ^(3+) lt Eu ^(3+) lt La ^(3+)`B. `La ^(3+) lt Eu ^(3+) lt Lu ^(3+) lt Y^(3+)`C. `Lu ^(3+), lt Eu ^(3+) lt La ^(3+) lt Y ^(3+)`D. `Y ^(3+) lt La ^(3+)lt Lu ^(3+) lt Eu^(3+)`
Lanthanide contraction is due to increase inA. iionic radiiB. shielding of 4f electronsC. effective nuclear chargeD. size of 4f orbitals
Lanthanide contraction is related toA. valence electronB. ionic radiiC. densitiesD. nuclear mass of various membere of the series
The steady decrease in atomic size in lanthanide series is called lanthanide confraction and in all amounts toA. 150 PmB. `10 Pm`C. `20 Pm`D. `40 Pm`
Lanthanide contraction is due to increase inA. shielding of 4f electronsB. effective nuclear chargeC. atomic numberD. size of 4f orbital
Lanthanide contraction due toA. poor shielding of 5f orbitalsB. poor shielding of 3f orbitalsC. prerfect shielding of 4f orbitalsD. poor shielding of 4f orbitals
The lanthanide contraction is responsible for the fact thatA. Zr and Yb have same sizeB. Zr and Nb have same oxidation sateC. Zr and Hf have same radiusD. Zr and Zn have same oxidation state
The most characteristic oxidation state of lanthanide isA. `+2`B. `+3`C. `+4`D. `+6`
Name a member of lanthanide series which is well known to exhibit `+4` oxidation state `,`A. CeB. LaC. LuD. Pr