English Medium इयत्ता १० - CBSE Question Bank Solutions

The products of chloro-alkali process are ______.

The number of molecules of water of crystallisation present in washing soda crystals is ______.

The aqueous solution of one of the following salts will turn red litmus to blue. This salt is:

The salt whose aqueous solution will have no effect on either red litmus or blue litmus is ______.

The aqueous solution of one of the following salts will turn phenolphthalein indicator pink. This salt is:

A salt whose aqueous solution will have a pH of more than 7 will be ______.

A salt is dissolved in water and the pH of this salt solution is measured with a universal indicator paper. If the pH of solution is less than 7, the salt is most likely to be ______.

Which of the following salts will give an aqueous solution having pH of almost 7?

P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn:

1. blue litmus red?
2. red litmus blue?

The metal salt A is blue in colour. When salt A is heated strongly over a burner, then a substance B is eliminated and a white powder C is left behind. When a few drops of a liquid D are added to powder C, it becomes blue again. What could be A, B, C and D?

When the concentrated aqueous solution of substance X is electrolysed, then NaOH, Cl₂ and H₂ are produced. Name the substance X. What is the special name of this process?

Give one example of a salt which gives an aqueous solution having:

pH less than 7

Give one example of a salt which gives an aqueous solution having:

pH equal to 7

Give one example of a salt which gives an aqueous solution having:

pH more than 7

Consider the following salts:

Na₂CO₃, NaCl, NH₄Cl, CH₃COONa, K₂SO₄, (NH)₂SO₄

Which of these salts will give:

1. acidic solutions?
2. neutral solutions?
3. basic solutions (or alkaline solutions)?

Write the name and formula of one salt which contains:

Two molecules of water of crystallisation.

Write the name and formula of one salt which contains:

Five molecules of water of crystallisation.

How many molecules of water of crystallisation (per formula unit) are present in:

Copper sulphate crystals

Define the following:

Reflex arc