Questions

India was one of the main centres of world trade and industry. Peter the Great of Russia was led to exclaim: “Bear in mind that the commerce of India is the commerce of the world and ... he who can exclusively command it is the dictator of Europe.”

Tehri Dam on Bhagirathi River in Uttarakhand (Height of 260 meters)

In chemistry, the term transition metal has three possible meanings: The IUPAC definition defines a transition metal as "an element whose atom has a partially filled d sub-shell, or which can give rise to cations with an incomplete d sub-shell".

Any of the set of metallic elements occupying a central block (Groups IVB–VIII, IB, and IIB, or 4–12) in the periodic table, e.g. iron, manganese, chromium, and copper. Chemically they show variable valency and a strong tendency to form coordination compounds, and many of their compounds are coloured.

Here in the given options, only iron (Fe) is a transition metal since Strontium is an alkaline earth, arsenic is a metalloid, hydrogen is (normally) a diatomic gas.

Uttar Pradesh is the most polluted state in India, with 15 of its cities among 30 cities with highest levels of toxic air in the country. Prime Minister Narendra Modi’s constituency Varanasi turned out to be the worst polluted city of UP. Countrywide, it came sixth.

Other towns and cities in UP on the list are Hapur, Bareilly, Firozabad, Kanpur, Agra, NOIDA, Allahabad, and Mathura where PM10 levels were way above permissible limits.

Kerala is the least polluted state in the country, India. In all the 14 districts of the state, NAAQ(National Ambient Air Quality Standards) standards are complied with and had lower concentrations of PM10. However, all the cities surpassed the PM10 standards prescribed by WHO.

The report - Airpocalypse II - is based on air pollution related data collected from Central and State Pollution Control Boards and Committees.

A greenhouse gas (GHG) is any gas in the atmosphere that absorbs and emits radiation in the thermal infrared range.

The increase in average global temperatures that results from an enhanced greenhouse effect.

Effects of increased greenhouse gas emissions:

Increases in the different greenhouse gases have other effects apart from global warming including ocean acidification, smog pollution, ozone depletion as well as changes to plant growth and nutrition levels.