Question
Pure iron is a soft metal.
When mixed with small amounts of tungsten it produces a hard alloy called tungsten steel.
Which statements are correct?
1 Pure iron is a transition element.
2 The particles in pure iron are arranged in ordered layers.
3 Tungsten steel is a compound.
A 1, 2 and 3 B 1 and 2 only C 1 only D 2 and 3 only
▶️Answer/Explanation
Ans: B
Pure iron(Fe) is a transition element.
In pure iron, the atomic particles (atoms) are arranged in an ordered structure known as a crystal lattice. This lattice arrangement is responsible for many of the properties of iron and other metals.
Tungsten steel refers to a steel alloy with a significant tungsten content, and it is not a compound in and of itself but a specific type of steel alloy.
Question
Which diagram shows the structure of an alloy?
▶️Answer/Explanation
Ans: D
An alloy is a homogeneous mixture of two or more elements, where at least one of the elements is a metal. Alloys are created by combining different elements to obtain properties that are different from those of their individual components. D has two elements.
Question
Which description of brass is correct?
A alloy
B compound
C element
D non-metal
▶️Answer/Explanation
Ans: A
Brass is an alloy of copper and zinc, often used for decorative applications and musical instruments.
Question
Substances P and Q both conduct electricity.
P is a mixture of two different types of atom.
Q is made of only one type of atom.
Which row describes P and Q?
▶️Answer/Explanation
Ans:
A
An alloy is a homogeneous mixture of two or more elements, where at least one of the elements is a metal.
An element is made of only one type of atom.
Question
Which row identifies an alloy, a pure metal and a non-metal?
▶️Answer/Explanation
Ans:
B
Brass is an alloy of copper and zinc, often used for decorative applications and musical instruments.
Copper is a pure metal.
Carbon is a non-metal.