171. Which of the following elements has the lowest melting point?

1. Titanium
2. Tungsten
3. Argon
4. Nickel

Option “C” is correct
Among the following elements, the lowest melting point is of Argon i.e. -189.4 °C.
172. Soil having high content of aluminum and iron oxide is also known as _____.

1. Meadow soil
2. Pedalfer soil
3. Chernozen soil
4. Podzol soil

Option “B” is correct
Pedalfer is composed of high amount of aluminum and iron oxides. It is a subdivision of the zonal soil order comprising a large group of soils in which sesquioxides increase relative to silica during soil formation. Pedalfers usually occur in humid areas.
173. Which of the following is an Inert Gas?

1. Hydrogen
2. Nitrogen
3. Oxygen
4. Argon

Option “D” is correct
Noble Gases are all odorless, colorless, monatomic gases with very low chemical reactivity.The six noble gases that occur naturally are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and the radioactive radon (Rn).
174. Ozone is an ______ of oxygen.

1. Allotrope
2. Isotope
3. Isobar
4. Isotone

Option “A” is correct
Ozone(O3)is a very reactive allotrope of oxygen that is destructive to materials like rubber and fabrics and is also damaging to lung tissue if present in lower atmosphere. But in upper atmosphere Ozone absorbs ultraviolet and functions as a shield for the biosphere against damaging effects of solar UV radiation.
175. Isotones is that nuclei of atomic nucleus in which-

1. Number of neutrons is same but number of protons is different
2. Number of protons is same but number of neutrons is different
3. Number of both protons and neutrons is same
4. Number of both protons and neutrons is different

Option “A” is correct
The Isotones are a set of nuclides/atoms having the same number of neutrons, but a different number of protons.
176. Taj Mahal is greatly affected due to –

1. Tourists
2. Acid rain
3. Deforestation
4. Sound pollution

Option “B” is correct
When sulphur pollutants fall on to buildings made from limestone and sandstone they react with minerals in the stone to form a powdery substance that can be washed away by rain. This is known as acid rain. The Taj Mahal in India have been damaged by this.
177. Which one of the following is not a ‘greenhouse gas’?

1. Chlorofluorocarbons
2. Methane
3. Carbon dioxide
4. Nitrogen

Option “D” is correct
Nitrogen is not a greenhouse gas but it is main component of air. 78% of air is N2 gas.
178. Aspirin is common name of –

1. Salicylic acid
2. Salicylate
3. Methyl salicylate
4. Acetyl salicylic acid

Option “D” is correct
Aspirin, also known as Acetyl Salicylic acid (ASA), is a medication used to treat pain, fever, or inflammation.
179. According to kinetic theory of gases, at the temperature absolute zero, the gas molecules-

1. start movement
2. become mass less
3. start emitting light
4. stop movement

Option “D” is correct
At absolute zero the gas molecules stop their movement or we can say that molecular kinetic energy will became zero.
180. 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 “C” is correct
Aerosol is a system of solid or liquid particles suspended by a mixture of gases. The term aerosolscovers a wide spectrum of small particles, like sea salt particles, mineral dust, pollen, drops of sulphuric acid and many others.
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166 thoughts on “Chemistry”

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    I Love chemical…it’s my favourite subject..mere iss mein se hmesha hi boht ache marks aate hai….and my interest is also in chemistry…

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    Personally I don’t think the criticism really sticks these days. In watchmaking as in everything else people copy you can say “are link influenced by” if you want some people do and hell if we had an Infinity Gauntlet and did a Snap on every watch that is obviously influenced by the Royal Oak we’d have a lot of dust in the air.

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    Skull form watches have never really made a third comeback partly because they’re impractical to carry and partly because pocket watches these days are a niche of link a niche the annual production of pocket watches from high-end makers like Patek AP and Vacheron is a drop in the ocean of wristwatches that come out of Switzerland every year. However watches with skulls on the dial or otherwise incorporated into the design of a watch are in the catalogue of several brands.

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