Answer the following question based on the diagram shown below: Name the material of the electrolytic cell.

The material used in electrolytic cell is crucible(i.e made of silica). The silica crucible is heated from the outside to keep lead bromide in the molten state. The silica is used because it can withstand high temperatures and acts as a non-conductor. It is non-reactive in nature.

Answer the following question based on the diagram shown below: What do you observe at the anode?

At anode, Br - ion migrate to anode. It gives an electron and become a bromine atom. Two bromine atoms combine to form bromine molecules. At the anode, the bromide ion loses electrons and forms bromine gas. These dark reddish-brown fumes of bromine gas are obtained. It can be shown by the following reaction. Br - → Br + e - Br + Br → Br 2

Answer the following question based on the diagram shown below: Give the cell reaction taking place at the cathode.

At the cathode, Pb 2 + ions migrate to the cathode. They take two electrons each and become neutral lead atoms. During the electrolysis process, Pb 2 + ions gain electrons at the cathode and become Pb atoms. Pb 2 + + 2 e - → Pb

E M B I B E

ICSE SELF STUDY IN CHEMISTRY>Chapter 19 - Practice Paper-7>UNSOLVED PRACTICE PAPERS FOR REVISION>Q 3

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10th ICSE

IMPORTANT

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How does ammonium hydroxide help in distinguishing between lead hydroxide and zinc hydroxide?

Important Questions on Practice Paper-7

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10th ICSE

IMPORTANT

ICSE SELF STUDY IN CHEMISTRY>Chapter 19 - Practice Paper-7>UNSOLVED PRACTICE PAPERS FOR REVISION>Q 3

How does ammonium hydroxide help in distinguishing between lead nitrate and zinc nitrate?

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10th ICSE

IMPORTANT

ICSE SELF STUDY IN CHEMISTRY>Chapter 19 - Practice Paper-7>UNSOLVED PRACTICE PAPERS FOR REVISION>Q 3

A given greenish coloured solution A on reaction with barium chloride solution gives a white precipitate that is insoluble in all the mineral acids and another part of solution A on treating with ammonium hydroxide gives dirty green precipitate. Identify anion.

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10th ICSE

IMPORTANT

ICSE SELF STUDY IN CHEMISTRY>Chapter 19 - Practice Paper-7>UNSOLVED PRACTICE PAPERS FOR REVISION>Q 3

A given greenish coloured solution A on reaction with barium chloride solution gives a white precipitate that is insoluble in all the mineral acids and another part of solution A on treating with ammonium hydroxide gives dirty green precipitate. Identify cation in the given solution A.

MEDIUM

10th ICSE

IMPORTANT

ICSE SELF STUDY IN CHEMISTRY>Chapter 19 - Practice Paper-7>UNSOLVED PRACTICE PAPERS FOR REVISION>Q 3

A blue coloured solution B on reaction with ammonium hydroxide initially gives a bluish-white precipitate which dissolves in excess of ammonium hydroxide to give solution C. Name the cation in solution B.

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10th ICSE

IMPORTANT

ICSE SELF STUDY IN CHEMISTRY>Chapter 19 - Practice Paper-7>UNSOLVED PRACTICE PAPERS FOR REVISION>Q 3

A blue coloured solution B on reaction with ammonium hydroxide initially gives a bluish-white precipitate which dissolves in excess of ammonium hydroxide to give solution C. What is the colour of solution B?

MEDIUM

10th ICSE

IMPORTANT

ICSE SELF STUDY IN CHEMISTRY>Chapter 19 - Practice Paper-7>UNSOLVED PRACTICE PAPERS FOR REVISION>Q 4

Answer the following question based on the diagram shown below:

Question Image