Exams › IBPS PO › General Awareness › Chemistry
4 questions with worked solutions.
Q1. Brass gets discoloured in air because of the presence of which of the following gases in air?
Answer: Hydrogen sulphide
Brass discolours in air because hydrogen sulphide reacts with the copper present in brass to form a dark sulphide layer. This causes tarnishing of the metal surface.
Q2. Which of the following is a non-metal that remains liquid at room temperature?
Answer: Bromine
Bromine is a non-metal and is liquid at room temperature. The other options are solids or gases under normal conditions.
Q3. Chlorophyll is a naturally occurring chelate compound in which the central metal is
Answer: magnesium
Chlorophyll is a chelate compound with magnesium as the central metal ion. Magnesium is essential for the structure and function of chlorophyll in photosynthesis.
Q4. How can water also be split into hydrogen and oxygen?
Answer: Both 2 and 3
Water can be split into hydrogen and oxygen by electrolysis, which requires an electric current. Solar-panel-equipped electric power stations and nuclear generators can provide the needed electricity, whereas mining cannot.