English Medium Class 10 - CBSE Question Bank Solutions for Science

Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.

Complete and balance the following equation:

Na  +  O₂ →

Complete and balance the following equation:

Na₂O  +  H₂O →

Complete and balance the following equation:

Complete and balance the following equation:

Cu (NO₃)₂ (aq)  +  Zn(s)  →

Fill in the following blank with suitable word:

 Magnesium liberates ............... gas on reacting with hot boiling water.

Fill in the following blank with suitable word:

The white powder formed when magnesium ribbon burns in oxygen is of ....................

Fill in the following blank with suitable word:

Ordinary aluminium strips are not attacked by water because of the presence of a layer of ................. on the surface of aluminium.

Fill in the following blank with suitable word:

Calcium is a ................. reactive metal than sodium.

With the help of examples, describe how metal oxides differ from non-metal oxides.

Which of the following elements would yield an acidic oxide.

Na, S, C, K, H

Which of the following elements would yield a basic oxide.

Na, S, C, K, H

Which of the following elements would yield a neutral oxide?

Na, S, C, K, H

What is the nature of the oxide Na₂O? What happens when it is dissolved in water? Write the chemical equation of the reaction involved.

What type of oxides are formed when non-metals react with oxygen? Explain with an example.

What type of oxides are formed when metals combine with oxygen? Explain with the help of an example.

Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid.

Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.

How do metals react with hydrogen? Explain with an example.

How do non-metals react with hydrogen? Explain with an example.