Chemistry – Page 47 of 50

461. Who discovered benzene?

1. Hal Anger
2. Michael Faraday
3. Bruce Ames
4. Nicolas Appert

Option “2” is correct.
Benzene was first discovered by the English scientist Michael Faraday in 1825.

462. First country to impose carbon tax is ________.

1. Australia
2. Iceland
3. USA
4. New Zealand

Option “4” is correct.
New Zealand is first country to impose carbon tax.

463. Which drug is used as an Anti-Inflammatory?

1. Metformin
2. Diazepam
3. Latanoprost
4. Prednisone

Option “4” is correct.
Prednisone drug is used as an Anti-Inflammatory drug. It is used to treat a number of different conditions, such as inflammation (swelling), severe allergies, adrenal problems, arthritis, asthma, blood or bone marrow problems, endocrine problems, eye or vision problems, stomach or bowel problems, lupus, skin conditions, kidney problems, ulcerative colitis, and flare-ups of multiple sclerosis.

464. Brownish ﬁlm formed on iron when left in open is called?

1. Dust
2. Shovel
3. Spade
4. Rust

Option “4” is correct.
When iron is exposed to water or air over a period of time, the iron reacts with oxygen in the presence of moisture to form a reddish-brown chemical compound, iron oxide. This is referred to as rust.

465. The substances which have very low ignition temperature and can easily catch ﬁre with a ﬂame are called _____________ substances.

1. Hazardous
2. Perilous
3. Incombustible
4. Inﬂammable

Option “4” is correct.
The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances. Examples of inflammable substances are petrol, alcohol, Liquified Petroleum Gas (LPG), etc.

466. Which of the following is used as non-stick coating for cooking utensils?

1. Perspex
2. Styrofoam
3. Polystyrene
4. Teflon

Option “4” is correct.
Non-stick cookware is a common application, where the non-stick coating allows food to brown without sticking to the pan. Non-stick is often used to refer to surfaces coated with “Teflon.”

467. Particulates (< 1 μm size) remaining suspended in air indefinitely and transported by wind currents are called-

1. Mists
2. Fumes
3. Aerosols
4. Smoke

Option “3” is correct.
Aerosol is a system of solid or liquid particles suspended by a mixture of gases. The term aerosols covers a wide spectrum of small particles, like sea salt particles, mineral dust, pollen, drops of sulphuric acid and many others.

468. A substance which readily forms colloidal solution in contact with water is called –

1. Extrinsic colloid
2. Associated colloid
3. Hydrophobic colloid
4. Hydrophilic colloid

Option “4” is correct.
The meaning of the word hydrophilic is water loving. Thus, a substance which readily forms colloidal solution in contact with water is called hydrophilic colloid.

469. Radioactive disintegration of uranium ultimately results in formation of –

1. Radium
2. Thorium
3. Polonium
4. Lead

Option “4” is correct.
Radioactive disintegration of uranium ultimately results in the formation of lead.

470. Which one of the following pairs is correctly matched?

1. Silver Iodide – Horn Silver
2. Silver Chloride – Artificial rain
3. Zinc Phosphide – Rat poison
4. Zinc Sulphide – Philosopher’s wool

Option “3” is correct.
Pairs is correctly matched as such-
Silver Iodide – Artificial rain, Silver Chloride – Horn Silver, Zinc Phosphide – Rat poison, Zinc Oxide – Philosopher’s wool.

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