Deficiency of which vitamin is responsible for osteomalacia?

Alum helps in purifying water by :
A. Coagulation of mud particles
B. Sedimentation of mud particles.
C. Dialysis
D. forming true solution with water
Choose the most appropriate answer from the options given below :

The units of rate constant of four reactions are given below. Arrange them in the increasing order of reaction.
(A)\(s^{-1}\)
(B) \(mol L ^{-1} s^{-1}\)
(C) \(\mathrm{mol}^{1 / 2} \mathrm{~L}^{-1 / 2} \mathrm{~s}^{-1}\)
(D) \(\mathrm{L}^{1 / 2} \mathrm{~mol}^{-1 / 2} \mathrm{~s}^{-1}\)
Choose the correct answer from the options given below:

Match the complexes given in List-I with their properties given in List-II

List-I (Complex)	List-II (Property)
(A) \(\left[{FeF}_6\right]^{3-}\)	(I) \(d^6\), high spin
(B) \(\left[{CoF}_6\right]^{3-}\)	(II) \(d^5\), high spin
(C) \(\left[{Mn}({CN})_6\right]^{3-}\)	(III) \(d^6\), low spin
(D) \(\left[{Co}({CN})_6\right]^{3-}\)	(IV) \(d^4\), low spin

Choose the correct answer from the options given below:

Read the passage carefully and answer the Questions
Aldehydes, carboxylic acids and ketones are widespread in the animal and plant kingdoms.
They play a pivotal role in various biochemical processes of life. Their presence in nature
adds fragrance and flavor. These compounds are widely used in food products, pharmaceuticals, paints, resins and other important product industries. These compounds are prepared by various laboratory methods, which mainly include oxidation, formylation, acylation and reduction. Due to the polar nature of the carbonyl group in aldehydes and ketones, they can exhibit different reactions like nucleophilic addition. They do exhibit redox and various condensation reactions which lead to the formation of various important compounds. On the other hand, the carboxylic acids are mainly prepared by oxidation and hydrolysis of different compounds. The carboxylic acid consists of a carbonyl group and the hydroxy group (attached to the carbonyl carbon atom). This makes it possible for the carboxylic acid to participate in various chemical reactions which involve cleavage of the C- OH bond and the O_H bond along with the reactions involving the complete -COOH group.
The IUPAC name of following compound is
OHC - C₆H₄ - CHO - p

The osmotic pressure of the equimolar solutions of the following at the same temperature will increase in the order:
(A) NaCl
(B) \(K_{2}SO_{4}\)
(C) \(K_{3}[Fe(CN)_{6}]\)
(D) \(NH_{2}CONH_{2}\)
Choose the correct answer from the options given below:

Salicylaldehyde can be prepared by treating phenol with

In a hydrogen atom the effect on potential energy of the electron with increase in radius of orbits will be :

If the radii of curvature of the faces of a double convex lens are 10 cm and 15 cm, respectively and its refractive index is 1.5, the focal length of the lens in air is

The wavelength of emitted wave due to energy transition in hydrogen atom from n = 3 to n = 2 energy level will be

If \(A=\left[\begin{array}{ll}0 & 1 \\ 1 & 0\end{array}\right]\), then the value of \((A+I)^3-4 A\) is:

The half-lives of two radioactive specimens are \(T_1=5\) years and \(T_2=7.5\) years.
The ratio of their disintegration constants \(\lambda_1\) and \(\lambda_2\) is:

Which one of the given structures is not the secondary lymphoid organ?