Class 10 Science - CBSE Guess, NCERT Questions Bank | Chemical Reactions and Equations

CBSE Guess and NCERT Questions Bank - CBSE Hot Questions - CBSE Sample Questions

Class 10 Science, Chemical Reactions and Equations

frequently asked questions
Class 10 Science - CBSE Guess, NCERT Questions Bank | Chemical Reactions and Equations
01. What is meant by exothermic and endothermic reactions? 
02. Why do we apply paint on iron articles?
03. Oil and fat containing food items are often flushed with a gas. Which is this gas and why are they flushed?
04. Explain: Rancidity, Corrosion, Redox reactions.
05. Why should chemical equations be balanced?
06. Why is respiration considered a n exothermic reaction? Explain.
07. Why is decomposition reactions called opposite of combination reactions? Justify your answer with equations.
08. What is Alumino-Thermite process? Explain.
09. A shiny brown coloured element X on heating in air becomes black. Name the element X and the Black coloured compound formed.

Class 10 Science, Chemical Reactions and Equations
CBSE Guess and NCERT Questions Bank - CBSE Hot Questions - CBSE Sample Questions

one mark questions
01. Define Reduction.
02. Define Oxidation.
03. What is the colour of AgNO3 precipitate?
04. Which chemical is generally used for detection of sulphates in aqueous solution?
05. What is the colour of BaSO4 precipitate?
06. What happens when Quick Lime reacts with water?  
07. What happens when magnesium reacts with oxygen?
08. Name the chemical present in photographic film.
09. What is the colour of SO2 gas?
10. What is Blue Vitriol?
11. What is Oil of Vitriol?
12. What is green vitriol?
13. Name some common reducing agents.
14. What is the colour of AgBr precipitate?
15. Define Double Displacement reaction.
16. What is the colour of Nitric Oxide gas?
17. Define Reducing Agent.
18. What is slaked lime?
19. Define Thermite Reaction.
20. Define Calcination.
21. Explain Photosynthesis.
22. Write a balanced chemical equation for the reaction which takes place when steam is passed over red hot iron.
23. What is the colour of ferrous salts?
24. Write balanced chemical equation when Zn reacts with dilute H2SO4.
25. What is photo-chemical reaction?
26. What is the colour of AgI precipitate?
27. PbO + C ----> Pb + CO Name the reducing agent.
28. Give names of some common oxidizing agents.
29. What are the colours of CuS, CuO and NO2 gas?
30. What is White Vitriol?
31. How does the colour change occurs when AgCl is exposed to sunlight?
32. What happens when Amonia reacts with dilute HCl?

Class 10 Science, Chemical Reactions and Equations
CBSE Guess and NCERT Questions Bank - CBSE Hot Questions - CBSE Sample Questions

two marks questions
01. What is Decomposition Reaction? Explain with examples.  
02. Fe2O3 + 2Al -----> 2Fe + Al2O3 + Heat
In this reaction, name the substance oxidized and substance reduced and also what are the oxidizing and reducing agents.  
03. What happens when copper utensils are exposed to prolonged atmospheric air?  
04. Define Exothermic Reaction and Combination Reaction.  
05. What is meant by Oxidizing Agent and Reducing Agent?
06. Define Corrosion. Write a chemical equation for the corrosion of iron.
07. Write the balanced chemical equations for the following:
(a) P4 + NaOH + H2O ----> PH3 + Na
(b) MnO2 + Al ----> Mn + Al2O3 + Heat
(c) CaC2 + H2O ------> C2H2 + Ca(OH)2
08. Define Endothermic Reaction with suitable examples.
09. What are Photochemical Reactions? Explain with examples.
10. What are the various methods to avoid corrosion?
11. Which are the anti-oxidants used to prevent rancidity?
12. Name the inert gas used to avoid oxidation of fried food items.
13. Give the reaction of Photosynthesis.

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