Metals and Non-Metals — Science STD 10 — Question

A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?

1. KMnO₄ is an oxidising agent, it oxidises FeSO₄
2. FeSO₄ acts as an oxidising agent and oxidises KMnO₄
3. The colour disappears due to dilution, no reaction is involved
4. KMnO₄ is an unstable compound and decomposes in presence of FeSO₄ to a colourless compound.

On moving from left to right in a period of the periodic table, the atomic number of elements increases. What happens to the size of atoms of elements on moving from left to right in a period?

1. Increases.
2. Decreases.
3. Remain the same.
4. First increases then decreases.

Which of the following are correct structural isomers of butane?

 

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

The chemical mostly used in the preparation of most of the soaps we use is.

Acetic acid was added to a solid X kept in a test tube. A colourless and odourless gas was evolved. The gas was passed through lime water which turned milky. It was concluded that.

-CHO represents the functional group:

Which of the following are present in a dilute aqueous solution of hydrochloric acid?

1. H₃O⁺ + Cl^–
2. H₃O⁺ + OH^–
3. Cl^– + OH^–
4. Unionised HCl

Chlorine reacts with saturated hydrocarbons at room temperature in the:

IUPAC name of first member of homologous series of ketones is:

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.