The color of an aqueous solution of zinc sulphate as observed in the laboratory is:
Green
Yellow
Blue
Blue
To show that zinc is a more active metal than copper, the correct procedure is to:
Add dilute nitric acid on strips of both the metals.
Observe transmission of heat through strips of zinc and copper.
Prepare a solution of zinc sulphate and hang a strip of copper into it.
Prepare a solution of zinc sulphate and hang a strip of copper into it.
Acetic acid solution turns:
blue litmus red
red litmus blue
blue litmus colourless
blue litmus colourless
On adding NaHCO3 to acetic acid, a gas is evolved which turns lime water milky due to the formation of:
Calcium bicarbonate
Calcium hydroxide
Calcium carbonate
Calcium carbonate
A yeast cell in which budding occurs was seen to have:
one bud cell
two bud cell
three bud cell
three bud cell
What is the important function of the presence of ozone in earth’s atmosphere?
The ozone layer shields the earth’s surface from the harmful effects of the UV radiation.