Matter in Our Surroundings — Science STD 9 — Question

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

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

A stone tied to a string is whirled in a circle. As it is revolving, the rope suddenly breaks.Then:

A stone is tied to a string and whirled in a circular path. The work done by the stone is:

In circular motion, the:

Barium chloride reacts with sodium sulphate to form Barium sulphate and sodium chloride. Then, according to the law of conservation of mass:

Bulk transport occurs through:

The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C respectively. Which one of the following correctly represents their boiling points in Kelvin scale?

Choose the correct unit for the relative density among the following:

Which one of the following set of phenomena would increase on raising the temperature?

Which of the following activity proves that particles of matter have space between them: