In the reaction 2PbO(s) + C(s) → 2Pb(s) + CO₂(g), which substance is oxidised?

An element 'X' is shiny brown and turns black on heating in air. Identify element 'X'.

What is the primary reason for the change in smell and taste of fats and oils left for a long time?

Balance the equation: NaOH + H₂SO₄ → Na₂SO₄ + H₂O. What is the coefficient for NaOH?

Which of the following is NOT a characteristic observation of a chemical reaction?

The reaction Ca(OH)₂(aq) + CO₂(g) → CaCO₃(s) + H₂O(l) is important for:

What is the chemical formula of the solid residue formed when lead nitrate is heated?

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

In the reaction 2PbO(s) + C(s) → 2Pb(s) + CO₂(g), which substance is oxidised?

An element 'X' is shiny brown and turns black on heating in air. Identify element 'X'.

What is the primary reason for the change in smell and taste of fats and oils left for a long time?

Balance the equation: NaOH + H₂SO₄ → Na₂SO₄ + H₂O. What is the coefficient for NaOH?

Which of the following is NOT a characteristic observation of a chemical reaction?

The reaction Ca(OH)₂(aq) + CO₂(g) → CaCO₃(s) + H₂O(l) is important for: