40.I am an acid present in our stomach and helps in digestion .
Who am I ?
41.I am a chemical mixed with LPG that helps in the detection
of leakage. Who am I ?
42.I am an universal solvent and I can dissolve many
substances. Who am I ?
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WORLD
Nile: 4,132 miles.
Amazon: 4,000 miles.
Yangtze: 3,915 miles
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