Class 10 Science 2026 Board Exam

(i) $\mathrm{AgN}{\mathrm{O}}_3+\mathrm{NaCl}\to \mathrm{NaN}{\mathrm{O}}_3+\mathrm{AgCl}$
(ii) ${\mathrm{K}}_2\mathrm{S}{\mathrm{O}}_4+\mathrm{BaC}{\mathrm{l}}_2\to \mathrm{BaS}{\mathrm{O}}_4+2KCl$
Which of the following options clearly describes both the reactions ?

The gases evolved on heating lead (II) nitrate crystals are :

(a) Name the substance oxidised and reduced in the following reaction :
$\mathrm{ZnO}+\mathrm{C}\to \mathrm{Zn}+\mathrm{CO}$
(b) Balance the following chemical reaction :
$\mathrm{Pb}(\mathrm{N}{\mathrm{O}}_3{)}_2+\mathrm{KI}\to \mathrm{Pb}{\mathrm{I}}_2+\mathrm{KN}{\mathrm{O}}_3$
(c) Give one example each of electrolytic decomposition and decomposition by sunlight.

Which one of the following can be used as an acid-base indicator by a visually impaired (blind) student ?

The natural sources of oxalic acid, lactic acid and methanoic acid respectively are :

(a) Explain chlor-alkali process with chemical equation. Name the products formed at anode and cathode.
OR
(b) Write the preparation of following compounds with balanced chemical equation :
(i) Baking soda
(ii) Bleaching powder
(iii) Plaster of Paris

Which of the following is a poor conductor of electricity ?

When an element 'X' reacts with water, it starts floating. Identify the element 'X' :

(a) What are amphoteric oxides ?
(b) Categorise the following based on their nature :
$\mathrm{ZnO}$, $\mathrm{N}{\mathrm{a}}_2\mathrm{O}$, $\mathrm{C}{\mathrm{O}}_2$

Read the following passage and answer the questions given below :