State your observations when decomposition of bicarbonates by dil. H 2 SO 4 2 NaHCO 3 + H 2 SO 4 → Na 2 SO 4 + 2 H 2 O + 2 CO 2 2 KHCO 3 + H 2 SO 4 → K 2 SO 4 + 2 H 2 O + 2 CO 2

2 NaHCO 3 + H 2 SO 4 → Na 2 SO 4 + 2 H 2 O + 2 CO 2 2 KHCO 3 + H 2 SO 4 → K 2 SO 4 + 2 H 2 O + 2 CO 2 The following observations are made when decomposition of given bicarbonate take place by dil. H 2 SO 4 ; 1 . Sulphates of sodium and potassium are formed. 2 . The liberation of carbon dioxide gas takes place. When this gas is passed through lime water, it turns milky.

Mention the colour changes observed when the following indicators are added. Solutions Acid Alkalies a Alkaline Phenolphthalein solution b Methyl orange solution c Neutral litmus solution

The following colour changes are observed; Solutions Acid Alkalies a Alkaline Phenolphthalein solution Colourless Pink b Methyl orange solution Pink Yellow c Neutral litmus solution Red Blue

EASY

10th ICSE

IMPORTANT

Earn 100

Distinguish by a chemical test.
Sodium hydroxide solution and ammonium hydroxide solution.

Important Questions on Practical Work

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10th ICSE

IMPORTANT

Selina Icse Concise Chemistry For Class 10>Chapter 13 - Practical Work>EXERCISE-13>Q 8

Distinguish by a chemical test.
Ammonium sulphate and sodium sulphate.

EASY

10th ICSE

IMPORTANT

Selina Icse Concise Chemistry For Class 10>Chapter 13 - Practical Work>EXERCISE-13>Q 8

Distinguish by a chemical test.
Sulphuric acid from nitric acid and hydrochloric acid.

MEDIUM

10th ICSE

IMPORTANT

Selina Icse Concise Chemistry For Class 10>Chapter 13 - Practical Work>EXERCISE-13>Q 9

Sodium hydroxide solution is added first in a small quantity, then in excess to the aqueous salt solutions of copper $(II)$ sulphate, zinc nitrate, lead nitrate, calcium chloride and iron $(III)$ sulphate. Copy the following table and write the colour of the precipitate in $(a)$ to $(e)$ and the nature of the precipitate (soluble or insoluble) in $(f)$ to $(j)$ .

Aqueous salt solution	Colour of precipitate when $NaOH$ is added in a small quantity	Nature of precipitate (soluble or insoluble) when $NaOH$ is added in excess
Copper $(II)$ nitrate	$(a)$	$(f)$
Zinc nitrate	$(b)$	$(g)$
Lead nitrate	$(c)$	$(h)$
Calcium chloride	$(d)$	$(i)$
Iron $(III)$ sulphate	$(e)$	$(j)$

EASY

10th ICSE

IMPORTANT

Selina Icse Concise Chemistry For Class 10>Chapter 13 - Practical Work>EXERCISE-13>Q 10

State your observations when lead nitrate solution and sodium chloride solution are mixed.

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10th ICSE

IMPORTANT

Selina Icse Concise Chemistry For Class 10>Chapter 13 - Practical Work>EXERCISE-13>Q 10

State your observations when zinc chloride solution, zinc nitrate solution and zinc sulphate solutions are added individually to barium chloride solution.

EASY

10th ICSE

IMPORTANT

Selina Icse Concise Chemistry For Class 10>Chapter 13 - Practical Work>EXERCISE-13>Q 10

State your observations when zinc chloride solution, zinc nitrate solution and zinc sulphate solutions are added individually to lead nitrate solution.

MEDIUM

10th ICSE

IMPORTANT

Selina Icse Concise Chemistry For Class 10>Chapter 13 - Practical Work>EXERCISE-13>Q 10

State your observations when decomposition of bicarbonates by dil.

H_{2} {SO}_{4}

2 {NaHCO}_{3} + H_{2} {SO}_{4} \to {Na}_{2} {SO}_{4} + 2 H_{2} O + 2 {CO}_{2} 2 {KHCO}_{3} + H_{2} {SO}_{4} \to K_{2} {SO}_{4} + 2 H_{2} O + 2 {CO}_{2}

MEDIUM

10th ICSE

IMPORTANT

Selina Icse Concise Chemistry For Class 10>Chapter 13 - Practical Work>EXERCISE-13>Q 12

Mention the colour changes observed when the following indicators are added.

Solutions	Acid	Alkalies
$(a)$ Alkaline Phenolphthalein solution
$(b)$ Methyl orange solution
$(c)$ Neutral litmus solution

Distinguish by a chemical test. Sodium hydroxide solution and ammonium hydroxide solution.

Important Questions on Practical Work

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Distinguish by a chemical test.
Sodium hydroxide solution and ammonium hydroxide solution.