Practice MCQ Questions and answers on Chemistry-GK

The increasing abundance of green house gases in atmosphere has led to the following effect except oxygen fertilization effect.

Fossil fuels — coal, petroleum, and natural gas — are the primary culprit behind climate change. They contribute more than 80 percent of greenhouse gas emissions — and 98 percent of CO₂ emissions alone. On the contrary, Geothermal energy is thermal energy generated and stored in the Earth. It is clean and sustainable.

When hydrogen burns it becomes water vapor. There are no carbon or other compounds released into the atmosphere. There are various compounds including carbon dioxide and carbon monoxide released when other fuels are burnt.

Bio-fertilizers are micro-organisms which bring about nutrient enrichment of soil by enhancing the availability of nutrients to crops. The micro-organisms which act as bio-fertilizers are bacteria, cyanobacteria (blue green algae) and mycorrhizal fungi. The symbiotic nitrogen-fixing bacteria convert free nitrogen to ammonia, which the host plant utilizes for its development.

The elements in the modern periodic table are arranged according to their atomic number.

Periodic table contains 7 periods.

The lightest chemical element is Hydrogen and the heaviest is Hassium.

Carbon is most electronegative among the following.

The s-, p-, and d-block elements of the periodic table are arranged into 18 numbered columns, or groups. The elements in each group have the same number of valence electrons.

Total number of elements in the periodic table is 118.