The negative logarithm of the hydrogen ion concentration, a measure of the acidity of a solution is called_______________?

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Gassypium herbaceum was originated in______________?

A. Ethipia and South Africa B. Kenya and South Africa C. Indonesia and Central America D. South Mexico and Central America...

One hectare is equal to___________________?

A. 3.47 acre B. 2.471 acre C. 1.71 acre D. 1.9 acre...

The actual amount H2O present in the air is called_____________?

A. Relative humidity B. Absolute humidity C. Both A and B D. non of these...

First ginning machine was invented in_______________?

A. 1893 AD B. 1880 AD C. 1793 AD D. 1650 AD...

A crop grown on residual moisture after harvesting rice is called__________________?

A. Barani crop B. Dubari crop C. Ratoon crop D. Sure crop...