Class 10 - SCIENCE - Question Bank - Very Short Answers Based Questions (Unsolved)
1. Why does not a wall immediately acquire a white colour when a coating of slaked lime is applied on it ?
2. Define displacement reaction with one example.
3. Identify the most reactive and least reactive metal : Al, K, Ca, Au.
4. Which of the following is a combination reaction and which is a displacement reaction ?
(a) Cl₂ + 2KI ——–> 2KCl + I₂
(b) 2K + Cl₂ ——–> 2KCl.
5. What is the difference between the following two reactions ?
(a) Mg + 2HCl ——–> MgCl2 + H2
(b) NaOH + HCl ——–> NaCl + H2O.
6. Identify the compound which is oxidised in the following reaction
H₂S + Br₂ ———–> 2HBr + S.
7. What happens chemically when quick lime is added to water ?