What is the role of mercuric sulphate?
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How is the measurement of ph made?
What is Electrovalence?
What variety of carbon is used for refining purposes ?
Why does a pencil look cracked, when partly immersed in water ?
What is the difference between hard and soft water ?
What is chemical oxygen demand?
what is ppm?how to prepare 75 ppm?
Which gas is used in refrigeration plants ?
How is food preserved ?
What are the uses of Alloy ?
On the cold morning, a gardener touches the iron blade of his spade with one hand and its wooden handle with other hand. Why does he feel the iron blade to be colder than the wooden handle ?
What is the composition of gun-powder ?