Industrial Chemistry — Set 4
Chemistry · औद्योगिक रसायन · Questions 31–40 of 40
Which metal is used in the 'Galvanic cell' as the standard reference electrode?
Correct Answer: C. Platinum
Platinum is used in the Standard Hydrogen Electrode because it is chemically inert. It provides a surface for the redox reaction without participating in it. It is essential for measuring the electrode potentials of other metals.
Which chemical is used as an 'antacid' to relieve stomach acidity?
Correct Answer: C. Magnesium hydroxide
Magnesium hydroxide, often called 'Milk of Magnesia', is a mild base. It neutralizes excess hydrochloric acid in the stomach to provide relief. It is safe for human consumption in controlled medicinal doses.
What is the chemical name of 'Baking Soda'?
Correct Answer: A. Sodium bicarbonate
Sodium bicarbonate releases carbon dioxide gas when it reacts with heat or acid. This property makes it essential for making bread and cakes light and fluffy. It is also used as a fire extinguisher component.
Which gas is used in fire extinguishers to displace oxygen and put out fires?
Correct Answer: C. Carbon dioxide
Carbon dioxide is heavier than air and creates a blanket over the fire. This cuts off the oxygen supply required for combustion to continue. It is non-flammable and does not leave a messy residue.
Which metal is found in 'Chlorophyll', the green pigment of plants?
Correct Answer: D. Magnesium
Magnesium is the central atom in the complex structure of the chlorophyll molecule. It is vital for the process of photosynthesis and capturing light energy. A deficiency of magnesium causes yellowing of plant leaves.
Which of the following is the main constituent of 'Glass'?
Correct Answer: A. Silica
Silica, or silicon dioxide, is the primary raw material obtained from sand. It provides the structural network that forms the glass upon cooling. Other chemicals are added to modify its properties like clarity or strength.
Which alloy is used for making the heating element of electric irons?
Correct Answer: B. Nichrome
Nichrome is an alloy of nickel and chromium with high electrical resistance. It does not oxidize or melt even when heated to very high temperatures. This makes it ideal for household heating appliances.
Which gas is used in electric bulbs to prevent the oxidation of the filament?
Correct Answer: A. Argon
Argon is an inert gas that does not react with the hot filament. It also helps to reduce the evaporation of the tungsten metal. Nitrogen is sometimes mixed with argon for the same purpose.
Which chemical is commonly known as 'Common Salt'?
Correct Answer: C. Sodium chloride
Sodium chloride is the essential mineral used in cooking and food preservation. It is obtained industrially through the evaporation of seawater or from rock salt mines. It is a vital electrolyte for the human body.
The Haber process is used for the industrial production of?
Correct Answer: B. Ammonia
The correct answer is Ammonia. The Haber process combines nitrogen and hydrogen at high temperature (450°C) and pressure (200 atm) using an iron catalyst to produce ammonia (NH₃). Fritz Haber won the Nobel Prize for this discovery. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.