Tissues — Science STD 9 — Question

Two elements X and Y have valencies of 5 and 3, and 3 and 2, respectively. The elements X and Y are most likely to be respectively:

Ammonium chloride is separated from a mixture of sodium chloride and ammonium chloride by the process of _____________?

A car travels towards the east with a certain constant velocity.The direction of net force on the car is:

Which of the following is not a postulate of Dalton's atomic theory?

Which one of the following is a suspension:

With increase in surface area,

On converting 308K, 329K and 391K to Celsius scale, the correct sequence of temperatures will be:

Two chemical species X and Y combine together to form a product P which contains both X and Y, X + Y → P, X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and Pare correct?

1. P is a compound.
2. X and Y are compounds.
3. X and Y are elements.
4. P has a fixed composition.

 A change in the physical state can be brought about:

When we increase the loudness of sound of a TV, the property of sound that changes is: