Forum

Metals and Non-metals

A metal that exists as a liquid at room temperature is obtained by heating its sulphide in the presence of air. Identify the metal and its ore and give the reaction involved

06/11/2024

Science

10th

Metals and Non-metals

A metal A, which is used in thermite process, when heated with oxygen gives an oxide B, which is amphoteric in nature. Identify A and B. Write down the reactions of oxide B with HCl and NaOH.

06/11/2024

Science

10th

Metals and Non-metals

What are the constituents of solder alloy? Which property of solder makes it suitable for welding electrical wires?

06/11/2024

Science

10th

Metals and Non-metals

The following reaction takes place when aluminium powder is heated with MnO2
3 MnO2 (s) + 4 Al (s) → 3 Mn (l) + 2 Al2O3 (l) + Heat
(a) Is aluminium getting reduced? (b) Is MnO2 getting oxidised?

06/11/2024

Science

10th

Metals and Non-metals

A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.

06/11/2024

Science

10th

Metals and Non-metals

When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z which easily catches fire. Identify X, Y and Z and also write the reaction involved.

06/11/2024

Science

10th

Metals and Non-metals

Compound X and aluminium are used to join railway tracks. (a) Identify the compound X (b) Name the reaction (c) Write down its reaction.

06/11/2024

Science

10th

Metals and Non-metals

Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg), treated with HNO3, hydrogen is not liberated, why?

06/11/2024

Science

10th

Metals and Non-metals

Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?

06/11/2024

Science

10th

Metals and Non-metals

During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure
silver after passing electric current?

06/11/2024

Science

10th