Metals and Non-Metals — Science STD 10 — Question

The salt which will give an acidic solution on dissolving in water is:

According to Mendeleev's periodic law, the elements were arranged in the periodic table in the order of:

1. Decreasing atomic numbers.
2. Increasing atomic numbers.
3. Decreasing atomic masses.
4. Increasing atomic masses.

In stainless steel alloy, iron metal is mixed with:

1. Cu and Cr
2. Cr and Ni
3. Cr and Sn
4. Cu and Ni

A student took four test tubes P, Q, R and S and filled about 8 mL of distilled water in each. After that he dissolved an equal amount of Na₂SO₄ in P, K₂SO₄ in Q, CaSO₄ in R and MgSO₄ in S. On adding an equal amount of soap solution and shaking each test tube well, a good amount of lather will be obtained in the test tubes:

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 are the correct characteristics of isotopes of an element?

1. Same atomic mass.
2. Same atomic number.
3. Same physical properties.
4. Same chemical properties.

1. (i), (ii) and (iv).
2. (ii), (iii) and (iv).
3. (ii) and (iii).
4. ​​​​​​​(ii) and (iv).

The pencil leads are made of mainly:

1. Lithium.
2. Charcoal.
3. Lead.
4. Graphite.

The chemical which is not required for the preparation of soap in the laboratory is:

An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following

Non - metals are: