What are the constituents of cements?
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Why does the water in tanks and ponds not freeze in winter ?
Why is a halo formed round the moon, when the sky is clear ?
What is Heat of Nutralication ?
Why does a freely supended magnetic needle always point North and South ?
it is possible that the air dissolves in any solvent?
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Why has every parachute a hole in the centre ?
Differentiate between modern periodic table and mendeleevs table?
Explain the Stable configuration?
when we covert any substance into vapour state from solid state, is it ionized or not?
Hom many total number of inner transition elements are?
In the calculation of calorific value of any fuel why the latent heat of vap. of water is taken as 587 kj/mol whereas actually it is 540kj/mol?
Is diamond element ?