Metals and Non-Metals — Science STD 10 — Question

Which of the following non-metals is a liquid?

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

In Mendele′ ev ’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the perioidc table later:

1. Germanium.
2. Chlorine.
3. Oxygen.
4. Silicon.

The major ore of aluminium is known as:

2mL each of concentrated HCl, HNO₃ and a mixture of concentrated HCl and concentrated HNO₃ in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be:

Which of the following gases can be used for storage of fresh sample of an oil for a long time?

1. Carbon dioxide or oxygen.
2. Nitrogen or oxygen.
3. Carbon dioxide or helium.
4. Helium or nitrogen.

The molecular formula of a homologue of butane is:

1. C₄H₈
2. C₃H₆
3. C₄H₆
4. C₃H₈

Which one of the following sets of materials can be used to prepare soap?

The hydrocarbon 2-methylbutane is an isomer of:

1. n-pentane.
2. n-butane.
3. Propane.
4. Iso-butane.

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

Mineral acids are stronger acids than carboxylic acids because:

1. Mineral acids are completely ionised.
2. Carboxylic acids are completely ionised.
3. Mineral acids are partially ionised.
4. Carboxylic acids are partially ionised.

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