The molecule with largest \(C-X\) bond length is

0.1 M NaCl solution has lower freezing point than \(0.1 M MgCl _2\) solution in water because:

Which of the following process is used in the extractive metallurgy of magnesium?

2.5 g of the following substances are dissolved in 500 mL of water. Arrange the resultant solutions in increasing order of their molarity ;
(A) \(C _6 H _{12} O _6\left(180 g mol ^{-1}\right)\)
(B) \(NH _2 CONH _2\left(60 g mol ^{-1}\right)\)
(C) \(NaCl \left(58.5 g mol ^{-1}\right)\)
(D) \(MgSO _4\left(120 g mol ^{-1}\right)\)
Choose the correct order from the options given below :

Choose the incorrect statements from the following :
(A) The dipole moment of cyclohexyl chloride is smaller than chlorobenzene.
(B) Alkyl halides are immiscible with water.
(C) The dipole moment of methyl chloride is higher than that of methyl fluoride.
(D) Chloroform doesn't undergo aerial oxidation in the presence of light
Choose the correct answer from the options given below :

Match List-l with List-ll

List-l(Materials)	List-lI(Conductivity ( \(\mathrm{S} \mathrm{m}^{-1}\) ))
(A) Gold	(I) \(1.0 \times 10^{-16}\)
(B) Germanium	(II) \(1.2 \times 10\)
(C) Glass	(III) \(4.5 \times 10^3\)
(D) Graphite	(VI) \(2.0\)

Choose the correct answer from the options given below:

Match List I with List II

LIST I	LIST II
A. \(\left[ Co \left( H _2 NCH _2 CH _2 NH _2\right)_3\right]_2\left( SO _4\right)_3\)	I. Tetracarbonylnickel(0)
B. \([\text{Ni}(\text{CO})_4]\)	II. Mercury tetrathiocyanatocobaltate(III)
C. \([\text{CoCl}_2(\text{en})_2]^+\)	III. tris(ethane-1,2-diamine)cobalt(III) sulphate
D. \(\text{Hg}[\text{Co}(\text{SCN})_4]\)	IV. Dichloridobis(ethane-1,2-diammine)cobalt(III)

Choose the correct answer from the options given below:

Which of the following can not be used as specimen for DNA finger printing?

Interstitial transition metal compounds
(A) have higher melting points than those of pure metals.
(B) have more reactivity than those of pure metals.
(C) are non-stoichiometric compounds.
(D) formed when small atoms like H, C or N are trapped inside the crystal lattice of the metals.
Choose the correct answer from the options given below:

Answer the question on the basis of passage given below:
Proteins are the polymers of about twenty different a-amino acids which are linked by peptide bonds. Proteins perform various structural and dynamic functions in the organisms. Proteins which contain only a-amino acids are called simple proteins. The secondary or tertiary structure of proteins get disturbed on change of pH or temperature and they are not able to perform their functions. This is called denaturation of proteins. Enzymes are biocatalysts which speed up the reactions in biosystems. Vitamins are accessory food factors required in the diet. They are classified as fat soluble (A, D, E and K) and water soluble (B group and C). Deficiency of vitamins leads to many diseases. Nucleic acids are the polymers of nucleotides which in turn consist of a base, a pentose sugar and phosphate moiety. Nucleic acids are responsible for the transfer of characters from parents to offsprings. There are two types of nucleic acids DNA and RNA. DNA contains a five carbon sugar molecule called 2-deoxyribose whereas RNA contains ribose.
Which of the following vitamin cannot be stored in our body?

Which of the following is a vertex of the positive region bounded by the inequalities:
\(4 x+y \geq 80 ; \quad 2 x+y \geq 60 ; \quad x, y \geq 0\)

A point charge -Q is placed at a small distance r from an isolated conducting plate. The direction of the electric field at a point A on the other side of the plane at the same distances r is :

Derivative of \(2 x^2\) with respect to \(5 x^4\) is: