carbon and its compounds — Science STD 10 — Question

State any two factors on which the lateral displacement of an emergent ray from a rectangular glass slab depend.

Translate the statements into chemical equations and then balance them:
Hydrogen gas combine with nitrogen to form ammonia.

Name the natural cleansing agent in an ecosystem.

Which metals are available in free state ?

Give the name of the flatworm which was the first to possess the eyes. State in which form and what it detects.

Take three test tubes and place clean iron nails in each of them.
- Label these test tubes A, B and C.
- Pour some water in test tube 'A' and cork it.
- Pour boiled distilled water in test tube 'B', add about 1 mL of oil and cork it.
- Put some anhydrous calcium chloride in test tube 'C' and cork it.
Leave these test tubes for few days, write your observations for all three test tubes and regarding your observation give reason.

What is the percentage of methane in biogas?

Which reasons cause presbyopia?

Which instrument is used to measure electric potential difference?