Chemistry
Grade-10
Easy
Question
Assertion: Alloys are made to enable casting ability.
Reason: Type metal (Pb + Sn + Sb) expands on solidification and is easily cast.
- 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.
Hint:
Alloy is a homogeneous mixture that consists of two or even more metals
The correct answer is: Both A and R are true, and R is the correct explanation of A.
- Alloy is a homogeneous mixture that consists of two or even more metals, homogeneous means denoting a process involving substances in the same phase, it could be liquid, solid or gas form. It can even consist of a metal and a nonmetal.
- Alloying helps in the good casting of metals, as pure metals tend to solidify when melted and contract as well. After they are alloyed they tend to expand and result in a good casting.
- An alloy which cannot be forged or rolled and can be shaped only as a casting.
- Type metal (Pb + Sn + Sb) expands on solidification and is easily cast.
- Both A and R are true, and R is the correct explanation of A.
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