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.
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’?
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.
