MEDIUM
7th ICSE
IMPORTANT
Earn 100

Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants & products.

Important Questions on Language of Chemistry

HARD
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 5 - Language of Chemistry>EXERCISE>Q 3
A chemical reaction is generally accompanied by certain external indications or characteristics. These include - change of - a] colour b] state c] smell d] evolution of gas e] formation of precipitate f] evolution or absorption of heat. With reference to change of colour - state the change in colour seen when the following are heated.
(i) Copper carbonate
(ii) Zinc carbonate
(iii) Mercury[II] oxide
(iv) Lead [IV] oxide.
MEDIUM
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 5 - Language of Chemistry>EXERCISE>Q 4

Give a balanced equation for the addition of iron to copper [II] sulphate solution. State the change in colour seen.

MEDIUM
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 5 - Language of Chemistry>EXERCISE>Q 5
In certain reactions a change of state is observed i.e. solid to liquid, liquid to gas etc. State the change of state of the reactants to give the respective products in each case.
(a) C+2S→ CS2
(b) NH3+HCl⇌ NH4Cl
(c) 2H2+O2→2H2O
(d) 2H2O→Electric current2H2+O2
MEDIUM
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 5 - Language of Chemistry>EXERCISE>Q 6
In certain reactions, a change of smell is observed. Give two examples from the daily life of the same.
MEDIUM
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 5 - Language of Chemistry>EXERCISE>Q 7
In certain reactions, an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving the addition of dilute hydrochloric acid to silver nitrate.
MEDIUM
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 5 - Language of Chemistry>EXERCISE>Q 7
In certain reactions, an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving the addition of iron [II] sulphate to sodium hydroxide.
MEDIUM
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 5 - Language of Chemistry>EXERCISE>Q 7
In certain reactions, an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving the addition of iron [III] chloride to ammonium hydroxide.
MEDIUM
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 5 - Language of Chemistry>EXERCISE>Q 7
In certain reactions, an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving the addition of copper [II] sulphate to sodium hydroxide.