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

Give the trends in atomic size on moving across the period left to right.

Why is the size of neon greater than fluorine?

Why is the size of sodium is greater than magnesium?

Which is greater in size an atom or a cation?

Which is greater in size an atom or an anion?

Which is greater in size Fe²⁺ or Fe³⁺?

Size of atom progressively becomes smaller when we move from sodium (Na) to chlorine (CI) in the third period of the periodic table?

Fill in the blank:

On moving across a period from right to left in the periodic table, the atomic size of the atom ___________.

Give reasons for the following:

The size of the anion is greater than the size of the parent atom.

Give reason for the following:

Argon atom is bigger than chlorine atom. 

Arrange the following in order of increasing radii:

CI^- , CI 

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

Is ammonia more dense or less dense than air?

What property of ammonia is demonstrated by the fountain experiment?

Ammonium salts decompose on heating. What other property do ammonium salts have in common?

State what you observe when a piece of moist red litmus paper is placed in a gas jar of ammonia.

Give two reactions to show reducing property of ammonia.

Name two gases which give dense white fumes with ammonia.

Name a metallic chloride soluble in ammonium hydroxide.

When an ammonium salt is warmed with a sodium hydroxide solution, a gas is evolved. State three ways in which you can identify this gas.