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Law of conservation of mass is not correct for
Which of the following is a water soluble vitamin?
In nuclear reactor, heavy water is used as –
The process of converting a solid directly into its vapor is called:
Which atmospheric layer contains ozone layer?
During which operating conditions of an automobile is carbon monoxide content in exhaust gas maximum?
Alkali metals have ______.
I. low melting points
II. low densities
Which of the following pair of element – atomicity is correct?
I. Helium – monoatomic
II. Oxygen – triatomic
Which law explains why planets move faster when they are closer to the Sun?
The height of a geo-stationary satellite from the Earth's surface is approximately :
