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Prelims -Environment

Question:Viral protein called DIII plays a key role to infect people with -View

(a) Zika virus

(b) Ebola Virus

(c) Dengue

(d) Chikungunya

Check Answer:

Answer: Zika Virus
Explaination

The vaccine developed by researchers from Arizona State University (ASU) in the U.S. works against a part of a Zika viral protein, called DIII, that plays a key role for the virus to infect people. http://www.thehindu.com/sci-tech/health/more-potent-safer-zika-vaccine-developed/article19479682.ece

Question:Acid rain is caused by 1. NO2 2. SO2 3. SO3 -View

(a) Only 2 & 3

(b) Only 2

(c) Only 1 & 2

(d) 1, 2 & 3

Check Answer:

Answer: Only 2
Explaination

• Sulfur dioxide and nitrogen oxides are two of the gases involved in the creation of acid rain. When these gases are released into the environment and mixed with water, oxygen, and other chemicals, they create acidic compounds, such as sulfuric acid and nitric acid, which results in the formation of acid rain. • Nitric oxide (NO), which also contributes to the natural acidity of rainwater, is formed during lightning storms by the reaction of nitrogen and oxygen, two common atmospheric gases. In air, NO is oxidized to nitrogen dioxide (NO2), which in turn reacts with water to give nitric acid (HNO3) . This acid dissociates in water to yield hydrogen ions and nitrate ions (NO3-) in a reaction analagous to the dissociation of carbonic acid, again lowering the pH of the solution.