Science
A metal 'X' is used in thermite process. When X is burnt in air it gives an amphoteric oxide 'Y'. 'X' and 'Y' are respectively :
- Fe and Fe2O3
- Al and Al2O3
- Fe and Fe3O4
- Al and Al3O4
Related Questions
The table below has information regarding pH and the nature (acidic/basic) of four different solutions. Which one of the options in the table is correct ?
Option Solution Colour of pH paper Approximate pH value Nature of solution (a) Lemon juice Orange 3 Basic (b) Milk of magnesia Blue 10 Basic (c) Gastric juice Red 6 Acidic (d) Pure water Yellow 7 Neutral Select washing soda from the following :
- NaHCO3
- Na2CO3.5H2O
- Na2CO3.10H2O
- NaOH
Consider the structures of the three cyclic carbon compounds A, B and C given below and select the correct option from the following:
- A and C are isomers of hexane and B is benzene.
- A is an isomer of hexane, B is benzene and C is an isomer of hexene.
- A is a saturated cyclic hydrocarbon and B and C are unsaturated cyclic hydrocarbons.
- A is cyclohexane and B and C are the isomers of benzene.
MnO2 + xHCl ⟶ MnCl2 + yH2O + zCl2
In order to balance the above chemical equation, the values of x, y and z respectively are
- 6, 2, 2
- 4, 1, 2
- 4, 2, 1
- 2, 2, 1