← CBSE Class 10 PYQ

Chemical Reactions and Equations

CBSE Class 10 · Science · 31 past questions

19 of 31 · show all

Q1 2026

The gases evolved on heating lead (II) nitrate crystals are…
Q2 2026

Which of the following is an example of a displacement reaction ?
Q3 2026

In the following equation…
Q5 2026

When ferrous sulphate crystals are heated in a test tube, we observe that…
Q6 2026

A student notices that her silver jewellery turned dull and had a grey-black coating over it after wearing…
Q7 Sample paper 2026-27

Chameleons contain crystals that reflect light and produce colour. Adjusting the spacing between these…
Q10 2025

The correct balanced chemical equation showing exothermic reaction in which natural gas burns in air is…
Q13 2025

The products formed when Aluminium and Magnesium are burnt in the presence of air respectively are…
Q14 2025

The metals obtained from their molten chlorides by the process of electrolytic reduction are…
Q16 2024

Solid Calcium oxide reacts vigorously with water to form Calcium hydroxide accompanied by the liberation of…
Q17 2024

Select from the following a process in which a combination reaction is involved…
Q19 2024

Identify the product 'X' obtained in the following chemical reaction…
Q20 2024

Consider the following Chemical equation…
Q24 2024

Select from the following a decomposition reaction in which source of energy for decomposition is light…
Q25 2024

MnO$_2$ + 4HCl $\to$ MnCl$_2$ + 2H$_2$O + Cl$_2$…
Q26 2024

Name the type of chemical reaction in which calcium oxide reacts with water. Justify your answer by giving…
Q28 2023

A metal ribbon 'X' burns in oxygen with a dazzling white flame forming a white ash 'Y'. The correct…
Q29 2023

Q. No. 17 to 20 are Assertion – Reasoning based questions. These consist of two statements – Assertion (A)…
Q30 2023

Which of the following is an example of endothermic process ?