Class 10 Science 2024 Board Exam

When $2$ mL of sodium hydroxide solution is added to few pieces of granulated zinc in a test tube and then warmed, the reaction that occurs can be written in the form of a balanced chemical equation as :

Select from the following a decomposition reaction in which source of energy for decomposition is light :

Solid Calcium oxide reacts vigorously with water to form Calcium hydroxide accompanied by the liberation of heat. From the information given above it may be concluded that this reaction

Consider the following statements about homologous series of carbon compounds :
(a) All succeeding members differ by $-{\text{CH}}_2$ unit.
(b) Melting point and boiling point increases with increasing molecular mass.
(c) The difference in molecular masses between two successive members is $16\text{ u}$.
(d) ${\text{C}}_2{\text{H}}_2$ and ${\text{C}}_3{\text{H}}_4$ are NOT the successive members of alkyne series.
The correct statements are –

Oxides of aluminium and zinc are :

Juice of tamarind turns blue litmus to red. It is because of the presence of an acid called :

The number of shells required to write the electronic configuration of Potassium (At. No. $19$)

A metal and a non-metal that exists in liquid state at the room temperature are respectively :

Consider the following compounds :
${\text{FeSO}}_4$ ; ${\text{CuSO}}_4$ ; ${\text{CaSO}}_4$ ; ${\text{Na}}_2{\text{CO}}_3$

The compound having maximum number of water of crystallisation in its crystalline form in one molecule is :

${\text{MnO}}_2+\text{4HCl}\to {\text{MnCl}}_2+{\text{2H}}_2\text{O}+{\text{Cl}}_2$

The reaction given above is a redox reaction because in this case :