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Q. The role of alum in water purification is
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Q. The coil wire in the electric room heater or electric cooking heater is called ________
Q. Materials for rain-proof coats and tents owe their water proof properties to
Q. An ultrasonic sound wave has a frequency higher than ?
Q. Scalding with steam is more severe than scalding by boiling water because
Q. In an atom, the order of filling up of the orbitals is governed by
Q. Why does a cannon recoil after firing ?
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