List of top Science Questions

What is a food chain? Explain it with an example.
The chemical substance used as a cast for setting broken bones in surgery is:
When magnesium ribbon is ignited, the flame produced by it is:
Zn + CuSO$_4$ $\rightarrow$ ZnSO$_4$ + Cu, the above reaction is an example of:
On moving from right to left across the period of the modern periodic table, the atomic size:
The molecular formula of ethane is C$_2$H$_6$. It has:
Draw a labelled diagram of human digestive system and explain the digestive process of food.
What is bio-magnification?
Write the importance of reproduction in living beings.
Explore the difference between blood and lymph.
What is external respiration?
Why do we sweat in summer?
What is photosynthesis? Write the equation of its chemical reaction.
What is the role of stomata and lenticels in respiration?
What is ascent of sap?
What is the effect of deforestation on wildlife?
What is Anodising?
Write two differences between minerals and ores.
What is the difference between displacement and double displacement reactions? Write equations for these reactions.
Write down the laboratory method of preparation of methane and its chemical reaction with chlorine.
Why does carbon mainly form covalent compounds?
Name the sodium compound which is used for softening hard water.
The aqueous solution of sodium carbonate is alkaline. Why?
What are the essential steps for forest conservation?
Write the balanced chemical equations for the following reactions:
(a) Zinc + Silver nitrate → Zinc nitrate + Silver
(b) Sodium + Water → Sodium hydroxide + Hydrogen.