Metals and Non-Metals — Science STD 10 — Question

One of the following does not inject an acidic liquid into the skin through its sting. This is:

1. Honey bee.
2. Ant.
3. Wasp.
4. Nettle leaf hair.

Vapours of acetic acid smell:

Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?

1. Na
2. Fe
3. Cr
4. Hg

Chlorine reacts with saturated hydrocarbons at room temperature in the:

1. Absence of sunlight.
2. Presence of sunlight.
3. Absence of moisture.
4. Presence of H₂SO₄

You are given a solution of AgNO₃. Which of the following do you think cannot displace Ag from AgNO₃ solution?

Acids are _______ in taste.

The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The pair of elements which belongs to the same group of the periodic table is:

1. A and B.
2. B and D.
3. A and C.
4. D and E.

The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its:

1. Oxide.
2. Hydride.
3. Sulphide.
4. Carbonate.

One of the following is not an allotrope of carbon. This is:

In one of the industrial processes used for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in chemical industry. The compound X and Y could be: