Carbon and its Compounds — Science STD 10 — Question

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.

The molecular formula of a homologue of butane is:

What do we observe on pouring acetic acid on red and blue litmus papers?

Most abundant metal on the surface of the earth:

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:

Reaction of metals with sulphuric acid produced:

The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called:

A solution reacts with marble chips to produce a gas which turns lime water milky. The solution contains:

1. Na₂SO₄
2. CaSO₄
3. H₂SO₄
4. K₂SO₄

What happens when a solution of an acid is mixed with a solution of a base in a test tube?

1. The temperature of the solution increases.
2. The temperature of the solution decreases.
3. The temperature of the solution remains the same.
4. Salt formation takes place.

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