Acids, Bases and Salts — Science STD 10 — Question

The three imaginary elements X, Y and Z represent a Dobernener's triad. If the atomic mass of element X is 14 and that of element Y is 46, then the atomic mass of element Z will be:

1. 28.
2. 60.
3. 78.
4. 72.

The metal which is always present in an amalgam is:

In stainless steel alloy, iron metal is mixed with:

The atomic number of carbon is:

X is a colourless gas with a distinct odour which consist of nitrogen and hydrogen atoms. It is produced naturally in the human body and in nature. Which gas is it? Is it acidic or basic in nature?

The daffodil plants grow best in a soil having a pH range of 6.0 to 6.5. If the soil in a garden has a pH of 4.5, which substance needs to be added to the soil in order to grow daffodils?

1. Salt.
2. Lime.
3. Sand.
4. Compost.

One of the following burns without producing a flame. This is:

Ethanol reacts with sodium and forms two products. These are:

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

Butanone is a four-carbon compound with the functional group: