(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Chemistry

State which of the two - a solution of HCl in water or in toluene is an electrolyte. Explain.

Assertion (A): Dry hydrogen chloride gas is collected by the upward displacement of air.

Reason (R): Hydrogen chloride gas is lighter than air.

A student takes Cu, Al, Fe and Zn strips, separately in four test tubes labeled as I, II, III and IV respectively. He adds 10 ml of freshly prepared ferrous sulphate solution to each test tube and observes the colour of the metal residue in each case.

He would observe a black residue in the test tubes:

______ does not form an acid salt.

Arrange the following as per instruction given in the bracket.

Mg, Cl, Na, S, Si (decreasing order of atomic size)

Arrange the following in order of increasing radii:

Cl⁻, Cl

Explain your choice.

Arrange the following in order of increasing radii:

Mg²⁺, Mg, Mg⁺

Explain your choice.

Arrange the following in order of increasing radii:

N, O, P

Explain your choice.

In Period 3 of the Periodic Table, element B is placed to the left of element A. On the basis of this information, choose the correct word from the option to complete the following statement:

The element A would have ______ atomic size than B.

Which one of the following has the largest atomic radius?

Which one has the largest size?

Give reason for the following:

The size of a Cl⁻ ion is greater than the size of a Cl atom.

This question refers to the elements of the Periodic Table with atomic numbers from 3 to 18. Some of the elements are shown by letters, but the letters are not the usual symbols of the elements.

Which of these have least atomic size in period 3?

A molecule of ______ contains a triple bond.

State which of the two - a solution of \[\ce{HCl}\] in water or in toluene is an electrolyte. Explain.

Write a balanced chemical equation for the following:

Reaction of Ammonia with heated copper oxide.

State one relevant observation for given reactions:

Burning of ammonia in air.

Give a balanced chemical equation for Catalytic oxidation of Ammonia

Give a balanced chemical equation for Reaction of Ammonia with Nitric acid

The equation 4NH₃ + 5O₂ → 4NO + 6 H₂O, represents the catalytic oxidation of ammonia. If 100 cm³ of ammonia is used calculate the volume of oxygen required to oxidize the ammonia completely