(English Medium) ICSE Class 10 - CISCE Important Questions

Identify the terms for the following:

The electrode where reduction takes place.

Answer the following question with reference to the electrorefining of copper:

What is the anode made of?

Answer the following question with reference to the electrorefining of copper:

What do you observe at the cathode?

Answer the following questions with reference to the electrorefining of copper:

Write the reaction taking place at the cathode.

The following sketch represents the electroplating of an Iron cup with Nickel metal.

Study the diagram and answer the following questions:

1. During electroplating, the iron cup is placed at the cathode. Why?
2. Name the ion that must be present in the electrolyte.
3. State one condition that is necessary to ensure that the deposit is smooth, firm and even.
4. Write the reaction taking place at the cathode.
5. What change would you observe at the anode?

The process of heating the concentrated ore in a limited supply or absence of air is ______.

Name the main constituent metal in the following alloy:
Stainless steel

Define:

Alloy

Name the alloys for the given composition:

Magnesium and aluminium

Identify the alloy in the given composition.

iron, nickel, chromium, carbon

Write one use of the following alloy:

Bronze

Write one use of the following alloy:

Fuse metal

Name the alloy which is made up of Copper, Zinc and Tin.

Potassium sulfite on reacting with hydrochloric acid releases _______ gas. (Cl₂, SO₂, H₂S)

State one relevant observation for given reactions:

Action of dilute Hydrochloric acid on iron (II) sulfide.

When dilute HCl is added to a salt Q, a brisk effervescence is produced and the gas turns lime water milky.

When NH4OH solution is added to the above mixture (after adding dilute HCl), it produces a white precipitate which is soluble in excess NH4OH solution.

Write balanced chemical equations to show The behavior of H₂SO₄ as an acid when it reacts with Magnesium

Complete the following by selecting the correct option from the choices given:

The metal which does not react with water or dilute H₂SO₄ but reacts with concentrated H₂SO₄ is _________. (Al/Cu/Zn/Fe)

The aim of the Fountain experiment is to prove that ______.

State your observations when Dilute Hydrochloric acid is added to Copper carbonate