Science
The reaction given below is a redox reaction because in this case :
MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
options
- MnO2 is oxidised and HCl is reduced.
- HCl is oxidised.
- MnO2 is reduced.
- MnO2 is reduced and HCl is oxidised.
Answer
MnO2 is reduced and HCl is oxidised
Reason — When manganese dioxide (MnO2) reacts with hydrochloric acid (HCl), chlorine gas (Cl2) is released. In this reaction,
- HCl gives chlorine gas, which means HCl is oxidised and
- MnO2 changes to MnCl2, showing that MnO2 is reduced.
Since one substance (HCl) is oxidised and another (MnO2) is reduced, this reaction is called a redox reaction.
Related Questions
Consider the following compounds :
FeSO4; CuSO4; CaSO4; Na2CO3
The compound having maximum number of water of crystallisation in its crystalline form in one molecule is :
options
- FeSO4
- CuSO4
- CaSO4
- Na2CO3
Oxides of aluminium and zinc are:
options
- Acidic
- Basic
- Amphoteric
- Neutral
Consider the following statements :
(a) The sex of a child is determined by what it inherits from the mother.
(b) The sex of a child is determined by what it inherits from the father.
(c) The probability of having a male child is more than that of a female child.
(d) The sex of a child is determined at the time of fertilisation when male and female gametes fuse to form a zygote.
The correct statements are:
options
- (a) and (c)
- (b) and (d)
- (c) and (d)
- (a), (c) and (d)
Chromosomes :
(a) carry hereditary information from parents to the next generation.
(b) are thread like structures located inside the nucleus of an animal cell.
(c) always exist in pairs in human reproductive cells.
(d) are involved in the process of cell division.
The correct statements are :
options
- (a) and (b)
- (c) and (d)
- (a), (b) and (d)
- (a) and (d)