Carbon and its Compounds — Science STD 10 — Question

Which element is stored in water and which element is stored in kerosene?

A white precipitate can be obtained by adding dilute sulphuric acid to:

An acid which can decolourise purple coloured potassium permanganate solution is:

Dissolving suger is an example of-

The electronic configurations of three elements X, Y and Z are:
X : 2
Y : 2, 8, 7
Z : 2, 8, 2
Which of the following is correct regarding these elements?

1. X is a metal.
2. Y is a metal.
3. Z is a non-metal.
4. Y is a non-metal and Z is a metal.

Enzyme which converts starch into glucose is:

In the experiment for determining the percentage of water absorbed by raisins, we do the final weighing of the raisins after keeping them dipped in water for about one hour. For the accuracy of the result, the extra water from the surface of the soaked raisins is removed by:

The modern periodic table was prepared by:

1. Dobereiner.
2. Newlands.
3. Bohr.
4. Mendeleev.

Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

1. Au
2. Cu
3. Na
4. K

1. 1 and 2
2. 1 and 3
3. 2 and 3
4. 2 and 4

A solution turns red litmus blue. Its pH is likely to be:

1. 1
2. 4
3. 5
4. 10