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Radium
Mercury
Zinc
Uranium
Potassium Permanganate is used for purifying drinking water
Which of the following is an element
What is the unit for measuring the amplitude of a sound ?
Reading of a barometer going down is an indication of
Decibel is the unit for
One fathom is equal to
Fathom is the unit of
Light year is a measurement of
Very small time intervals are accurately measure by
One kilometre is equal to how many miles