Galvanisation and Alloying of Metals

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Which of the following metals is a liquid at room temperature?

Chlorine (Cl)

Sodium (Na)

Mercury (Hg) (correct)

Magnesium (Mg)

What is the main reason why copper is used for making electrical circuits?

Copper is a liquid at room temperature

Copper is a good conductor of electricity (correct)

Copper is very hard and durable

Copper is highly reactive with other metals

Which of the following can be classified as an alloy?

Chlorine

Magnesium oxide

Zinc oxide

Brass (Cu and Zn) (correct)

Why is solder, an alloy of lead and tin, used for welding electrical wires together?

Because lead and tin make a strong bond with the wires Signup and view all the answers

Which metal mentioned in the text does not corrode easily?

Zinc (Zn) Signup and view all the answers

What type of reaction occurs when metallic oxides are heated with certain metals?

Single displacement reaction Signup and view all the answers

Why is iron never used in its pure state?

Pure iron is very soft and stretches easily when hot. Signup and view all the answers

What substance is iron mixed with to create stainless steel?

Nickel and chromium Signup and view all the answers

What can change the properties of any metal?

Mixing it with another substance Signup and view all the answers

How is an alloy prepared?

By melting the primary metal and then dissolving other elements in it in definite proportions Signup and view all the answers

Why is 24 carat gold not suitable for making jewellery?

It is very soft. Signup and view all the answers

What is added to pure gold to make it hard enough for making jewelry?

Copper or silver Signup and view all the answers

Which type of oxides are aluminium oxide and zinc oxide?

Amphoteric oxides Signup and view all the answers

What is the process known as when metals above hydrogen in the activity series displace hydrogen from dilute acids?

Displacement reaction Signup and view all the answers

Which metal is more reactive, sodium (Na) or magnesium (Mg)?

Sodium (Na) Signup and view all the answers

What is the term used for a homogeneous mixture of two or more metals, or a metal and a non-metal?

Alloy Signup and view all the answers

In the context of metals and non-metals, which of the following statements is false?

Non-metals are malleable and ductile. Signup and view all the answers

Which element is known for forming chloride ions by gaining electrons?

Chlorine (Cl) Signup and view all the answers