211. Which acid is released when an Ant bites?

1. Hydrochloric Acid
2. Formic Acid
3. Acetic Acid
4. Phosphoric Acid

Option “B” is correct
The acid produced by ants is called formic acid.The name comes from the Latin word for ant, which is “formica.” Chemically, it is a simple carboxylic acid.
212. Which of the following is not a donor atom?

1. Phosphorus
2. Antimony
3. Arsenic
4. Aluminium

Option “D” is correct
In semiconductor physics, a donor is a dopant atom that, when added to a semiconductor, can form a n-type region. All except aluminium are donor atom.
213. The element found maximum in the soil layer is-

1. Oxygen
2. Nitrogen
3. Manganese
4. Silicon

Option “A” is correct
The element found the maximum in the soil layer is Oxygen 46.8% followed by Silicon 27.2%, Calcium 3.65% and Carbon 0.6%.
214. Which is the most reactive metal?

1. Sodium
2. Calcium
3. Iron
4. Potassium

Option “D” is correct
215. Aluminium surface is often ‘Anodized’. This means the deposition of a layer of-

1. Chromium Oxide
2. Aluminium Oxide
3. Nickel Oxide
4. Zinc Oxide

Option “B” is correct
Anodizing is an electrical-chemical process by which the surface of a metal is made durable and rust resistant. In this process, a layer of Aluminium Oxide is deposited on Aluminium.
216. Galvanized iron is coated with-

1. Aluminium
2. Galena
3. Silver
4. Zinc

Option “D” is correct
Galvanization is the process of applying protective zinc coating to steel or iron to prevent rusting.
217. Bronze is an alloy of-

1. Copper and Tin
2. Copper and Silver
3. Copper and Iron
4. Copper and Lead

Option “A” is correct
Bronze is an alloy made up of Copper and another metal Tin. Compositions may vary but most modern bronze is 88% Copper and 12% Tin.
218. Dry ice is-

1. Solid water
2. Mountain ice
3. Solid CO2
4. Solid carbon mono oxide

Option “C” is correct
Dry ice sometimes referred to as solid  or dry snow is the solid form of Carbon dioxide.
219. 0 K is equivalent to –

1. 273°C
2. – 273°C
3. 0°C
4. 100°C

Option “B” is correct
0 K is equivalent to – 273°C.
220. ___________ gives hardness to stainless steel.

1. Zinc
2. Lead
3. Carbon
4. Tin

Option “C” is correct
Carbon gives hardness to Stainless Steel.
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