Chemical Reaction
Trending Questions
Q.
How many total atoms are in ?
Q. “Matter can neither be created nor be destroyed in a chemical reaction”. But we can change it from one form to another. The law is:
- None of the above
- Law of constant proportion
- Law of definite proportion
- Law of conservation of mass
Q.
What is the atomicity of the molecule S8?
4
8
3
2
Q.
Explain the following types of chemical reactions giving two examples for each of them.
(a) Displacement reaction
(b) Double decomposition reaction
Q. When magnesium ribbon burns in air or oxygen, a product is formed. State the type of chemical reaction and name the product formed in the reaction. Write the balanced chemical equation of this reaction.
Q. Which of the following is a chemical change?
a) Melting of ice
b) Baking a cake
c) Cutting fruits
d) Boiling of water
a) Melting of ice
b) Baking a cake
c) Cutting fruits
d) Boiling of water
Q. What do you observe when a few pieces of iron are dropped in a blue solution of copper sulphate?
Q.
SO2 and SO3 represents the same compound.True/False
True
False
Q. What are petrochemical?
Q. What are petrochemicals?
Q. The atomic mass of nitrogen is ______.
- 16 u
- 14 u
- 8 u
- 7 u
Q. What do you observe when a few pieces of iron are dropped in a blue solution of copper sulphate?
Q. A+BC→AC+B is a representation of displacement reaction.
- True
- False
Q. Iron nails were dipped in a beaker containing a blue solution. After some time, it was observed that the colour of the solution changed from blue to green. Which of the following reactions correspond to the recorded observations?
- Fe + CuSO4 → Cu + FeSO4
- Fe + ZnSO4 → Zn + FeSO4
- Zn + CuSO4 → Cu + ZnSO4
- Zn + FeSO4 → Fe + ZnSO4
Q. Statement (1) : Composition and molecular structure of the reactants can be changed by having a chemical change.
BECAUSE
Statement (2) : It is said to be a chemical reaction when new substances and new bonds are formed and old bonds are broken.
BECAUSE
Statement (2) : It is said to be a chemical reaction when new substances and new bonds are formed and old bonds are broken.
- (1) is true, (2) is true, (2) is the correct explanation of (1).
- (1) is false, (2) is true
- (1) is true, (2) is true
- (1) is false, (2) is false
- (1) is true, (2) is false
Q. What informations are provided by the chemical equation 2Mg+O2=2MgO
Q. Paheli prepared a blue coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojho prepared a yellowish green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?
Q.
What is the atomicity of the molecule S8?
4
8
3
2
Q. Paheli prepared a blue coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojho prepared a yellowish green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?
Q. Iron nails were dipped in a beaker containing a blue solution. After some time, it was observed that the colour of the solution changed from blue to green. Which of the following reactions correspond to the recorded observations?
- Zn + CuSO4 → Cu + ZnSO4
- Fe + CuSO4 → Cu + FeSO4
- Fe + ZnSO4 → Zn + FeSO4
- Zn + FeSO4 → Fe + ZnSO4
Q. (a) Define displacement reaction.
(b) What happens when iron nails are placed in a copper sulphate solution? Write word equation of the reaction involved.
(c) Will the reaction happen if iron nails are placed in zinc sulphate solution?
(b) What happens when iron nails are placed in a copper sulphate solution? Write word equation of the reaction involved.
(c) Will the reaction happen if iron nails are placed in zinc sulphate solution?
Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
What is the difference between displacement and double displacement reactions? Write relevant equations for the above.
Q. State the type of reaction of the following represent and balance the ones that are not balanced.
KNO3+H2SO4→HNO3+KHSO4
KNO3+H2SO4→HNO3+KHSO4
Q. Match the reactions given in column I with the type of reactions given in column II and mark the correct option from the codes given below
Q. Sort the following in increasing order of their atomicity.
- Ne
- O3
- SO3
- CH4
Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
Explain the reaction between magnesium and sulphuric acid.
Q. Which one of the following is not a chemical action?
- Breaking down compounds into elements
- Formation of a molecule by combining atoms of elements
- Formation of a new compound and a new element by reaction of a compound and an element
- Separation of the molecules in a mixture