Science
The products formed when Aluminium and Magnesium are burnt in the presence of air respectively are :
options
- Al3O4 and MgO2
- Al2O3 and MgO
- Al3O4 and MgO
- Al2O3 and MgO2
Metals & Non-Metals
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Answer
Al2O3 and MgO
Reason —
When aluminium burns in air, it forms aluminium oxide (Al2O3) and when magnesium burns in air, it forms magnesium oxide (MgO).
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Related Questions
Electrolysis of water is a decomposition reaction. The mass ratio (MH : MO) of hydrogen and oxygen gases liberated at the electrodes during electrolysis of water is :
options
- 8 : 1
- 2 : 1
- 1 : 2
- 1 : 8
The following table shows the pH values of four solutions A, B, C and D on a pH scale :
The solutions A, B, C and D respectively are of a
options
- Strong acid, weak acid, neutral, strong base
- Weak acid, neutral, weak base, strong base
- Weak acid, neutral, strong base, weak base
- Weak acid, neutral, strong base, strong acid
Consider the following reactions :
(a) Dilute hydrochloric acid reacts with sodium hydroxide.
(b) Magnesium oxide reacts with dilute hydrochloric acid.
(c) Carbon dioxide reacts with sodium hydroxide.
It is found that in each case :
options
- Salt and water is formed.
- Neutral salts are formed.
- Hydrogen gas is formed.
- Acidic salts are formed.
Reaction between two elements A and B, forms a compound C. A loses electrons and B gains electrons. Which one of the following properties will not be shown by compound C?
options
- It has high melting point.
- It is highly soluble in water.
- It has weak electrostatic forces of attraction between its oppositely charged ions.
- It conducts electricity in its molten state or aqueous solution