Question

Match the following:

1. Brass	i. Surgical instruments
2. Stellite	ii. Skin ointment
3. Lunar caustic	iii. Condenser tubes
4. Calamine	iv. Hair dye

A. (1)-(i), (2)-(iv), (3)-(iii), (4)-(ii)
B. (1)-(iv), (2)-(iii), (3)-(ii), (4)-(i)
C. (1)-(ii), (2)-(iv), (3)-(i), (4)-(iii)
D. (1)-(iii), (2)-(i), (3)-(iv), 4()-(ii)

Answer 1

Brass is corrosion resistant, so it is used in thermal power plants. Lunar caustic is a colouring agent. Calamine is used against discomfort from skin irritations. Stellite is non-reactive for the human body. They are used in the replacement of heart valves.

Complete answer:
Condenser tubes are used in thermal power plants for the condensation process. The condenser tubes are made up of brass. Brass is resistant to corrosion for many substances like liquid ammonia or nitrogen compounds.
Stellite is anticorrosive, non-reactive, and nonmagnetic for the human body. They are used as surgical instruments. Stellite is an alloy mainly having cobalt.
Fused or moulded silver nitrate is known as lunar caustic. It is used for colouring purposes such as hair dye and ink.
Calamine is used to treat insect bites, itchiness, skin irritation, or sunburn. It is a cream or lotion. So, calamine is a skin ointment.
So, the correct match is as following:

1. Brass	iii. Condenser tubes
2. Stellite	i. Surgical instruments
3. Lunar caustic	iv. Hair dye
4. Calamine	ii. Skin ointment

**Therefore, option (D) (1)-(iii), (2)-(i), (3)-(iv), (4)-(ii), is correct.

Note:**
Lunar caustic is also used to treat eye infections. Calamine lotion contains zinc oxide and ferric oxide. Silver nitrate is also used in photography. It is very less sensitive to light. The chemical formula of lunar caustic is ${\text{AgN}}{{\text{O}}_{\text{3}}}$. Brass is a copper-zinc alloy. Alloys are non-reactive for corrosion. Brass alloys are also used for making statues.