📚NCERT Questions — NCERT10
100 solved questions with detailed explanations
Which of the following is NOT a characteristic observation of a chemical reaction?
In the reaction 4Na(s) + O₂(g) → 2Na₂O(s), which substance is reduced?
When solutions of sodium sulphate and barium chloride are mixed, a white insoluble substance is formed. What is this substance?
Why is respiration considered an exothermic process?
An element 'X' is shiny brown and turns black on heating in air. Identify element 'X'.
Keeping food in airtight containers helps to slow down rancidity by:
The reaction of hydrogen gas with oxygen gas to form water is a combination reaction. What is the physical state of water formed under standard conditions?
The black coating formed on the surface of copper powder when heated in a china dish is:
Reactions in which there is an exchange of ions between the reactants are called:
Which of the following is an example of an exothermic reaction?