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