The main greenhouse gas emitted from agricultural activities (livestock and rice paddies) is:
A. Methane
B. Chlorofluorocarbon
C. Nitrous oxide
D. Carbon dioxide
Answer: Option A
Solution (By JKExamLibrary)
Methane (CH₄) is released from enteric fermentation in livestock (cattle) and from anaerobic decomposition in flooded rice paddies. It has a high global warming potential (25× CO₂ over 100 years). CO₂ mainly from fossil fuels. N₂O from fertilizers. CFCs from refrigerants. Agriculture contributes significantly to anthropogenic GHG emissions. Reducing methane can have rapid climate benefits.
Explanation:
Acids turn blue litmus red; bases turn red litmus blue. Litmus is a purple dye extracted from lichens, used as an indicator. pH < 4.5 red, > 8.3 blue, intermediate purple. Neutral solution (pH 7) does not change the color of litmus significantly. This is a simple test for acid-base nature.
Explanation:
Baking soda (NaHCO₃) is an anhydrous salt and does not contain water of crystallization. Blue vitriol (CuSO₄·5H₂O), washing soda (Na₂CO₃·10H₂O), and gypsum (CaSO₄·2H₂O) all contain fixed water molecules integrated into their crystal lattice, which gives them their specific shape and color.
Explanation:
Magnesium (Z=12): configuration 2,8,2. Period = number of shells = 3; Group = 2 (2 valence electrons). Be is Group 2, Period 2; Ca is Group 2, Period 4; Sr Period 5.
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