Carbon and its Compounds — Science STD 10 — Question

Which one of the following does not increase while moving down the group of the periodic table?

1. Atomic radius.
2. Metallic character.
3. Valence electrons.
4. Shells in the atoms.

In order to study personification reaction we first prepare 20% solution of sodium hydroxide. If we record the temperature of this solution just after adding sodium hydroxide flakes to water and also test its nature using litmus, it may be concluded that the process of making this solution is:

You are asked to prepare hard water in your laboratory. Select a group from the following groups of salts, any salt of which you may dissolve in distilled water to obtain hard water.

Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?

When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to:

One of the following is not an organic acid. This is:

Which element is stored in water and which element is stored in kerosene?

Which of the following is not an endothermic reaction?

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

Which of the following is not the property of non - metals?