NCERT Solution for Class 10 Science Chapter 1
Chemical Reactions and Equations
Exercises Questions
Page No-15
Questions No-8
(a) Potassium bromide(aq) + Barium iodide(aq) ® Potassium iodide(aq) +
Barium bromide(s)
(b) Zinc carbonate(s) ® Zinc oxide(s) + Carbon dioxide(g)
(c) Hydrogen(g) + Chlorine(g) ® Hydrogen chloride(g)
(d) Magnesium(s) + Hydrochloric acid(aq) ® Magnesium chloride(aq) + Hydrogen(g)
(a) 2KBr + BaI2 → 2KI + BaBr2
Type of reaction: Double displacement reaction. Because the cation K+ and Ba2+ have exchanged their anions Br– and SO42- .
(b) ZnCO3 → ZnO + CO2
Type of reaction: Decomposition reaction. Because in this reaction single reactant break down into two product
(c) H2 + Cl2 → 2HCl
Type of reaction: Combination. Because in this reaction two reactant combine into single product.
(d) Mg + 2HCl → MgCl2 + H2
Type of reaction : disclacement reaction because H in HCl has been displaced by Mg.
(a) 2KBr(aq)+BaCl₂→2Kl(aq)+BaBr₃(s)
It is a double displacement reaction.
(b) ZnCO₃(s)→ZnO(s)+CO₂(g)
It is a decomposition reaction.
(c) H₂(g)+Cl₂→2HCl(g)
It is a combination reaction.
(d) Mg(s)+2HCl(aq)→MgCl₂+H₂(g)
It is a displacement reaction.