Arrange the following ligands in the increasing order of their field strength:
(A) en
(B) edta \({ }^{4-}\)
(C) \(S ^{2-}\)
(D) \(OH ^{-}\)
Choose the correct answer from the options given below:

Toluene reacts with a halogen in the presence of FeCl 3, giving a mixture of ortho and para halo compounds. This type of reaction is called:

The osmotic pressure of a solution prepared by dissolving \(5 0 ~ m g\) of H2SO4 in 2 liters of water at \(2 5 ^{ \circ } C\) will be

Arrange the following elements in decreasing order of their radii:
(A) La
(B) Pr
(C) Gd
(D) Yb
Choose the correct answer from the options given below:

Read the passage carefully and answer the questions
Alcohols and phenols are formed when a hydrogen atom in a hydrocarbon, aliphatic and aromatic respectively is replaced by - OH group. These are further classified on the basis of number of hydroxy groups and according to the hybridization of the carbon atom \(sp ^2\) or \(sp ^3\) to which the -OH group is attached. They find applications in industry as well as in day-to-day life. One of the most commercially obtained alcohol also known as wood spirit is obtained by destructive distillation of wood. Both alcohols and phenols are acidic in nature. The acidity of alcohols and phenols vary according to the nature of substituent(s) attached to them. Alcohols and phenols react with carboxylic acids, acid chlorides and acid anhydrides to form esters. Introduction of acetyl group in alcohols and phenols is called acetylation. Phenol undergo electrophilic aromatic substitution reaction because the -OH activates the benzene ring. It undergoes nitration, halogenation and sulphonation reactions.
Identiify the strongest acidic compound

Arrange the following acids in increasing order of their acidic strengths: \(HCOOH , FCH _2 COOH , NO _2 CH _2 COOH , ClCH _2 COOH\)

Conversion of molecule X to Y follows second order kinetics. If concentration of X is increased to three times how will it affect the rate of formation of Y?

Match List-I with List-II

List-I (Barriers)	List-II (Examples)
(A) Physical barrier	(I) Acid in the stomach
(B) Cellular barrier	(II) Interferons
(C) Cytokine barrier	(III) Leucocytes in our body
(D) Physiological barrier	(IV) Skin on our body

Choose the correct answer from the options given below:

Primary productivity does not depends upon which one of the following factors?

In a double slit experiment, instead of taking slits of equal widths, one slit is made twice as wide as the other. Then, in the interference pattern:

Consider the lines \(l_1: \frac{x-1}{0}=\frac{y-1}{1}=\frac{2-z}{1}\) and \(l_2: \frac{x}{2}=\frac{y}{0}=\frac{2 z-1}{4}\), then which of the following are correct?
(A) Direction Ratios of \(l_1=\langle 0,1,1\rangle\)
(B) Direction Ratios of \(l_2=\langle 2,0,2\rangle\)
(C) Angle between \(l_1\) and \(l_2=\frac{\pi}{3}\)
(D) Angle between \(l_1\) and \(l_2=\frac{2 \pi}{3}\)
Choose the correct answer from the options given below :

Which of the following statements is not true?

The nuclear force is: