If two substances A and B have \(P^o_A: P^o_B = 1 : 2\) and have mole fraction in the ratio \(1:2\), then mole fraction of A in vapours is:

Which of the following reagents are used for denaturation of alcohol?

In a coordination entity the central atoms or ions are referred to as:

The correct order of relative reactivity of alkyl halides towards \(S N^1\) reaction is:
(I) \(PhCH _2 Cl\)
(II) \(Ph _2 CHCl\)
(III) \(Ph _3 CCl\)

Match List-I with List-II

List-I (Name of the test/Reaction)	List-II (Species)
(A) Tollen's Test	(I) \(Cu ^{2+} a n d OH ^{-}\)
(B) Fehling's Test	(II) \(Zn - Hg and HCl\)
(C) Clemmensen reduction	(III) \(2\left[ Ag \left(NH _3\right)_2\right]^{+} \) and \(OH ^{-}\)
(D) Wolff Kishner reduction	(IV) Hydrazine KOH /ethylene glycol

Choose the correct answer from the options given below :

Tertiary amino group is found in :

Name the cell which is used in hearing aids.

Which of the following are similarities between the sinking fund and the savings account?
(A) The sinking fund and the savings account are both financial tools.
(B) Both can be used in any emergency.
(C) They both involve setting aside an amount of money for the future.
(D) Both are long-term accounts which can be closed any time.
Choose the correct answer from the options given below

Read the passage carefully and give the answers to the question :
Does the number of species in a community really matter to the functioning of the ecosystem? This is a question for which ecologists have not been able to give a definitive answer. For many decades, ecologists believed that communities with more species, generally, tend to be more stable than those with less species. According to the International Union for Conservation of Nature and Natural Resources (IUCN) (2004), the total number of plant and animal species described so far is more than 1.5 million.
Among the vertebrates, which of the following is the most species-rich group ?

Match List - I with List - II.

List – I	List – II
(A) Typhoid	(I) Lungs
(B) Pneumonia	(II) Respiratory Passage
(C) Common cold	(III) RBC and liver
(D) Malaria	(IV) Small intestine

Choose the correct answer from the options given below:

A line makes equal angles with coordinate axis. Direction cosines of the line are:

\(\tan ^{-1} 3+\tan ^{-1} \lambda=\tan ^{-1}\left(\frac{3+\lambda}{1-3 \lambda}\right)\) is valid for which values of \(\lambda\) ?

The amount of urea required to make a 500 mL solution of \(20 \%( w / w )\) concentration is