MEDIUM
10th CBSE
IMPORTANT
Earn 100

A sample of copper (ll) carbonate when heated in a hard glass tube, formed a black residue of copper (ll) oxide with the evolution of a colourless gas. Identify the colourless gas.

Important Questions on Question Bank
MEDIUM
10th CBSE
IMPORTANT

HARD
10th CBSE
IMPORTANT
Solve the following crossword puzzle using the guidelines given in the table below:
Down:
1. The reaction which occurs in the presence of sunlight.
4. The process in which an atom in a molecule is replaced by another atom.
7. The process of splitting a substance into two or more substances.
8. The reaction occurring as
Across:
2. The new substance produced when two substances react.
3. The process in which two substances combine to produce a single substance.
5. The process in which coal burns to form carbon dioxide.
6. The process in which hydrogen from a compound is removed.

HARD
10th CBSE
IMPORTANT
Match the substances in column A with their pH values in column B.
A | B |
(a) Lemon juice | (i) |
(b) Tomato juice | (ii) |
(c) Vinegar | (iii) |
(d) Urine | (iv) |
(e) Blood | (v) |
(f) Lime water | (vi) |

MEDIUM
10th CBSE
IMPORTANT
Match the acids given in column A with their natural sources given in column B.
A | B |
(a) Tannic acid | (i) Red ants |
(b) Formic acid | (ii) Curd |
(c) Tartaric acid | (iii) Tea |
(d) Lactic acid | (iv) Tomato |
(e) Oxalic acid | (v) Tamarind |

MEDIUM
10th CBSE
IMPORTANT

MEDIUM
10th CBSE
IMPORTANT

EASY
10th CBSE
IMPORTANT

MEDIUM
10th CBSE
IMPORTANT
