X → KOH Y (gas turns red litmus blue) + Z → Zn + KOH Y (gas) . X → Δ gas (does not support combustion) Identify (X) to (Z):

X = NH 4 NO 2 Y = NH 3 Z = KNO 2

X = ( NH 4 ) 2 Cr 2 O 7 Y = NH 3 Z = Cr 2 O 3

X = ( NH 4 ) 2 SO 4 Y = NH 3 Z = K 2 SO 4

X = NH 4 NO 3 Y = NH 3 Z = KNO 3

MEDIUM

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Sodium hydroxide cannot be used to identify :

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Important Questions on Analytical Chemistry

EASY

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

Element not present in Nessler’s reagent is

MEDIUM

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

State one relevant observation for of the following:

Lead nitrate solution is treated with sodium hydroxide solution dropwise till it is in excess.

EASY

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

What colour is formed in the reaction of ammonia with Nessler’s reagent?

EASY

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

Distinguish between the following pair of compounds using the reagent given in the bracket.

Ferrous sulphate solution and ferric sulphate solution. (using sodium hydroxide solution)

EASY

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

Which element is not present in Nessler’s reagent?

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Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

Formulae for Nessler's reagent is:

EASY

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

The Nessler's reagent contains

EASY

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

When ammonia gas is passed through Nessler's solution the colour becomes-

HARD

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

(X) \overset{KOH}{\to} (Y) (gas turns red litmus blue) + (Z) \overset{Zn + KOH}{\to} (Y) (gas) .

(X) \overset{Δ}{\to} gas (does not support combustion)

Identify (X) to (Z):

EASY

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

Alkaline solution of mercuric iodide is known as Nessler's reagent.

EASY

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

When ammonia gas is passed through Nessler's solution the colour becomes-

MEDIUM

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

Complete the following reaction:

${NH}_{4} Cl + NaOH \overset{∆}{\to}$

HARD

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

A colourless water soluble solid 'X' on heating gives equimolar quantities of Y and Z. Y gives dense white fumes with HCl and Z does so with NH₃. Y gives brown precipitate with Nessler's reagent and Z gives white precipitate with nitrates of Ag⁺, Pb²⁺ and

H g_{2}^{2 +}

. 'X' is :

EASY

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

Alkaline solution of mercuric iodide is known as Nessler's reagent.

HARD

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

Select the incorrect statement.

HARD

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

A white crystalline solid 'A' on boiling with caustic soda solution gives a gas 'B' which on passing through an alkaline solution of potassium tetraiodomercurate (II) solution gives a brown ppt. The substance 'A' on heating evolves a neutral gas 'C', which is inert at room temperature and reactive in the presence of catalyst and does not give brown fumes with nitric acid oxide.

The gas 'C' is

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Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

In Nessler's reagent for the detection of ammonia, the active species is:

MEDIUM

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

When an ammonium salt is warmed with a sodium hydroxide solution, ammonia gas is evolved. State three ways in which you could identify this gas.

HARD

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

A compound (A) on heating with an excess of caustic soda solution liberates a gas (B) which gives white fumes on exposure of $HCl$ . The resultant alkaline solution thus obtained after heating again liberates the same gas (B) when heated with zinc powder. Compound (A) on heating alone gives a neutral oxide of nitrogen not nitrogen gas. Choose the correct statement from the following:

HARD

Science>Chemistry>Analytical Chemistry>Action of Sodium Hydroxide on Metallic Salt Solutions

Nessler's reagent is used to detect

Sodium hydroxide cannot be used to identify :

Important Questions on Analytical Chemistry

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