Acids, Bases and Salts — Science STD 10 — Question

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

A student requires hard water for an experiment in his laboratory which is not available in the neighbouring area. In the laboratory, there are some salts, which when dissolved in distilled water can convert it into hard water. Select from the following groups of salts, a group, each salt of which when dissolved in distilled water will make it hard.

An element X reacts with hydrogen, when heated, to form a covalent hydride H₂X. If H₂X has a smell of rotten eggs, the element X is likely to be:

1. Carbon.
2. Sulphur.
3. Chlorine.
4. Phosphorus.

The atomic number of an element X is 16. The symbol of ion formed by an atom of this element will be:

Generally, non-metals are not conductors of electricity. Which of the following is a good conductor of electricity?

1. Diamond.
2. Graphite.
3. Sulphur.
4. Fullerene.

Which of the following element would lose an electron easily?

1. Mg.
2. Na.
3. K.
4. Ca.

compound → element + element

The property which is not shown by acids is:

Which of the following pairs of substances, on reaction, will not evolve H₂​ gas?