Extra Question Chapter 1:Chemical Reaction And Equations
Extra Question II Chapter 1:Chemical Reaction And Equations
Extra Question Chapter 2:Acid Ans Base
Important Question Chapter 3:Metal and Non Metal
Chapter 4:Carbon And Its Compoundl
Chapter 5:Periodic Classification of elememt
Chapter 7:Control and coordination
Chapter 8:How Do Organisms Reproduce?
Chapter 9:Hearedity And Evolution
Chapter 10:Light Reflection and Refraction
Chapter 11:The Human Eye and Colorful World
Q1. What change in colour is observed when white silver chloride is left exposed to sunlight?
Q2 Give an example of a redox reaction.
Q3. Which of the following listed metals can displace zinc from its salt solution? Give reason for
your
answer with a chemical equation:
Copper, Lead, Magnesium, Silver
Q4. Giving an example list two information which make a chemical reaction more useful? [ CBSE Delhi 2015]
Q5. Why magnesium ribbon clean before burning?
Q6. Which Substance is used for white-washing and its mixture with water feel hot?
Q7. Why Copper powder become black on heating ?
Q8 What Is Redox Reaction? Identifying The Substance Oxidised And The Substance Reduced In The
Following Reactions:
(i) 2PbO + C → Pb + Co2
(ii) MnO2 + 4HCL →
MnCl2 + H2O + Cl2. [CBSE 2012]
Q9.Classify The Following Chemical Reactions As Exothermic Or Endothermic:
(i) Water Is Added To
Quick Lime.
(ii) Dilute Sulphuric Acid Is Added To Zinc Granules.
(iii)When Ammonium
Chloride Is Dissolved In Water In A Test Tube It Becomes Cold.
(iv) The Decomposition Of
Vegetable Matter Into Compost.
(v) Electrolysis Of Water.
(vi) Silver Chloride Turns Grey In
The Presence Of Sunlight To Form Silver Metal. [CBSE 2017]
Q10. Decomposition Reaction Require Energy Either In The Form Of Heat Or Light Or Electricity For Breaking Down Down The Reactants. Write One Equation Each For Decomposition Reaction Where Energy Is Supplied In The Form Of Heat, Light And Electicity. [CBSE 2018]