Chemistry
Duralumin is an alloy with composition:
P — Al and Mg
Q — Al, Cu and Mg
R — Al and Mn
Only P
Only Q
Both P and R
Only R
Related Questions
Steel is an alloy of iron and:
- Nickel
- Zinc
- Carbon
- Aluminium
The reason for using aluminium in the alloy duralumin is
- Aluminium is brittle.
- Aluminium gives strength.
- Aluminium brings lightness.
- Aluminium lowers melting point.
Assertion (A): Hydrogen is a non-metal and can even form positive ions.
Reason (R): Metals are defined as the elements which form positive ions by the loss of electrons.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Sodium and potassium are reactive elements.
Reason (R): Sodium and potassium occur in free states
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.