Carbon and its Compounds — Science STD 10 — Question

What is an ionic bond? What type of bond is present in oxygen molecule?

You have been provided with three test-tubes. One of these test-tubes contains distilled water and the other two contain an acidic and a basic solution respectively. If you are given only blue litmus paper, how will you identify the contents of each test-tube?

Give account of chemical properties?
Oxidation of ethanol.

A white powdery substance having strong smell of chlorine is used for disinfecting drinking water supply at waterworks. Identify the substance. Give its chemical name and write the chemical reaction for its preparation.

Write the balanced chemical equation for the following reaction and identify the type of reaction.
Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.

When you add sodium hydrogen carbonate to acetic acid in a test tube, a gas liberates immediately with a brisk effervescence. Name this gas. Describe the method of testing this gas.

Give two examples each of the metals that are good conductors and poor conductors of heat respectively.

When the powder of a common metal is heated in an open china dish, its colour turns black. However, when hydrogen is passed over the hot black substance so formed, it regains its original colour. Based on the above information answer the following questions:

1. What type of chemical reaction takes place in each of the two given steps?
2. Name the metal initially taken in the powder form. Write balanced chemical equations for both reactions.

Explain the given reaction with the example:

Saponification reaction.

Write the names and formulae for the first three members of the homologous series of chloroalkanes.