The Post True False Assignment Chemical Reactions and Equations contains subjective questions along with fill-ups and true-false type questions. This will help the students in improving the chapter knowledge.

True False Assignment Chemical Reactions and Equations

Q 36. Choose the correct about rancidity (i) Rancidity is a reduction process (ii) Rancidity is an oxidation process

Q 37. When silver coloured metal (A) is added to dilute sulphuric acid, solution (B) is formed which is a colourless solution and a gas (c) is evolved which is the colourless name ‘A’, ‘B’ and ‘C’ and write the equation?

Q 38. An ‘A’ blue coloured crystalline salt on heating decomposes to ‘B’ white substance. When in a blue salt solution, a metal (Zinc) is added, it gives rise to colourless solution ‘C’ with leaving behind ‘D’ reddish-brown metal. Name the compounds ‘A’, ‘B’, ‘C’ and ‘D’

Q 39. A mixture of Chromium Oxide is heated with Aluminium powder:                                                                                                  a) Write the reaction?                                b). Give one application of this reaction?

Q 40. Choose and state as true or false

  • In an exothermic reaction, heat is evolved. True / False
  • Decomposition is possible by thermal decomposition, electrolytic decomposition and by photochemical decomposition. True / False
  • The displacement reaction of metals is based on reactivity series of metals. True / False
  • The oxidising agent is a substance that causes the addition of oxygen or the removal of hydrogen from other substances. True / False
  • The reduction is a process that involves the removal of hydrogen and the addition of oxygen. True / False

Q 41. Give a word fill in the blank

  • The substance which causes the addition of oxygen or removal of hydrogen from other substances is … …….. agent.
  • The presence of air, the presence of moisture, the presence of salt in water, electropositive metals leads a metal to ……… …
  • …… …………metals are less electropositive and hence they do not corrode in moist air.
  • A reaction in which an insoluble product formed during the reaction of two ionic compounds in an aqueous solution is called …. reaction.
  • A substance that causes the addition of Hydrogen or removal of Oxygen from another substances is called ……….
  • The arrangement of elements in decreasing order of their electropositive character is called ………
  • When sodium metal is added to water, it gets …….
  • In the order of decreasing order of reactivity in Ca > Al > Zn > H > Ag > Pt The most reactive metal is …………….
  • In the order of decreasing order of reactivity as stated above the least reactive metal is …………………
  • In the order of Ca > Al > Zn > H > Ag > Pt Choose the metal which from above can react with all the salt solutions. ……………

 

Activity-based One line – Two-line quiz questions

Q 42. Why do we preserve Sodium metal in kerosene oil?

Q 43. What happens when we heat coloured crystalline copper sulphate?

Q 44. In electrolysis of water, on which electrode does hydrogen migrates and why?

 Q 45. What happens when quick lime is added to water? Name the reaction and compounds formed.

 Q 46. What happens to green coloured Iron sulphate crystals on heating?

Q 47. Why does the white precipitate of AgCl change to grey on exposure to light?

 Q 48. Why does silver or gold not react easily when exposed to air or light?

 Q 49. Why does ZnSO4 solution not react with Cu(s)?

 Q 50. How would you conclude that rusting is a slow electrochemical reaction?

 

To check answers click the link below
https://www.sciencemotive.com/class-10/answers-true-false-chemical-reactions-and-equations/

 

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