Exercise

On undergoing complete combustion in an adequate supply of oxygen, an organic compound produces only carbon dioxide and water vapour as the products. 

Based on this information, Which of the following homologous series could the compound belong to?

$\left(\mathrm{P}\right)$ alkanes
$\left(\mathrm{Q}\right)$ alcohols
$\left(\mathrm{R}\right)$ aldehydes

A compound with which of the following functional groups is most likely to cause the decomposition of baking soda to produce carbon dioxide?

$1$ mole of ethene and $1$ mole of ethyne are separately made to completely undergo addition reaction to form the respective saturated compound.
Which of the following will be different for the two reactions?
$\left(\mathrm{P}\right)$ The number of moles of the saturated compound formed.
$\left(\mathrm{Q}\right)$ The number of moles of the hydrogen consumed.

A young person can clearly see nearby objects but not distant objects.

Which of these statements is true for the person?

A ray of light passes through a glass prism.

When do the light rays get refracted?

Which of the following correctly gives the sequence of events that take place when human eye changes its focus from a distant object to an object closer to the eye?

Nanda saw rays of sunlight entering into a dark room as shown below. He then did something to the air in the room after which he was NOT able to see the rays of sunlight in the room. What is it that Nanda could have done to make the rays of sunlight invisible? Justify your answer.

Space is mostly vacuum, devoid of any medium. What colour does the Sun appear to the astronauts on International Space Station? Give reasons for your answer.