NCERT Solution for Class 10 Science Chapter 1
Chemical Reactions and Equations
Exercises Questions
Page No-15
Questions No-7
(a) Calcium hydroxide + Carbon dioxide ® Calcium carbonate + Water
(b) Zinc + Silver nitrate ® Zinc nitrate + Silver
(c) Aluminium + Copper chloride ® Aluminium chloride + Copper
(d) Barium chloride + Potassium sulphate ® Barium sulphate + Potassium chloride
1. Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
Balanced Equation:
Ca(OH)2 + CO2 → CaCO3 + H2O
2. Zinc + Silver nitrate → Zinc nitrate + Silver
Balanced Equation:
Zn + 2AgNO3 → Zn(NO3)2 + 2Ag
3. Aluminium + Copper chloride → Aluminium chloride + Copper
Balanced Equation:
2Al + 3CuCl2 → 2AlCl3 + 3Cu
4. Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride
Balanced Equation:
BaCl2 + K2SO4 → BaSO4 + 2KCl
These equations are now balanced, ensuring that the number of atoms of each element on both sides of the equation is the same, in accordance with the law of conservation of mass.
(a) Ca(OH)₂+CO₂→CaCO₃+H₂O
(b) Zn+2AgNO₃→Zn(NO₃)₂+2Ag
(c) 2Al+3CuCl₂→2AlCl₃+3Cu
(d) BaCl₂+K₂SO4→BaSO₄+2KCl
(a) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
Ca(OH)2 + CO2 → CaCO3 + H2O
(b) Zinc + Silver nitrate → Zinc nitrate + Silver
Zn + AgNO3 → Zn(NO3)2 + Ag
(c) Aluminium + Copper chloride → Aluminium chloride + Copper
2Al + 3CuCl2 → 2AlCl3 + 3Cu
(d) Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride
BaCl2 + K2SO4 → BaSO4 + 2KCl