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All transition elements display typical metallic properties like high melting point, boiling point, tensile strength, high malleability and ductility, luster, etc. Their metallic character increases down the group and elements of \(4 d\) and 5d series exhibit higher metallic characters. They show variable oxidation states and forms a number of coloured compounds due to the presence of unpaired electrons which shows d-d transitions and makes them paramagnetic.
Which of the following will be coloured in aqueous medium?

In aldehydes, the carbonyl group is bonded to a carbon and hydrogen, while in ketones it is bonded to two carbon atoms. The carbonyl compounds in which carbonyl group is bonded to oxygen are known as carboxylic acid and their derivatives.
Arrange the following steps of Aldol condensation in the correct order of their occurance.
A. Abstraction of proton
B. Protonation
C. Formation of Enolate
D. Nucleophilic Addition
E. Elimination
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The osmotic pressure is one of the four colligative properties which depends on the number of particles of solute in the solution, irrespective of their nature. The osmotic pressure is equal to the product of concentration, gas constant and temperature. It is the most commonly used property for the determination of the molar mass of biomolecules. In many situations, the molecules get dissociated or
associated when they are dissolved in a solvent, thereby changing the number of molecules in the solution. As a result, an abnormal molecular mass is obtained. The extent of dissociation or association is given by van't Hoff factor (i), which is the ratio of normal molar mass to abnormal molar mass. It is related with the degree of association or ionization. The introduction of van't Hoff factor in the osmotic pressure equation modifies the equation.
What is the value of the van't Hoff factor for\(NaCl , K _2 SO _4\) and KCl,respectively?

Arrange the following in decreasing order of the number of molecules contained in:
(A) \(1 6 ~ g\) of \(O _2\)
(B) \(1 6 ~ g\) of \(CO _2\)
(C) \(1 6 ~ g\) of \(CO ^{-}\)
(D) \(16 g of H _2\)
Choose the correct order:

Which of the following is/are not considered as transition elements?
Ag, Mo, Zn, Hg, W

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Haloalkanes undergo nucelophilic substitution reactions owing to the polarity of CX bond. The nucleophile reacts with the haloalkane on the carbon possessing a partial positive charge holding the halogen atom. The halogen atom \(X\) is replaced by a nucleophile. Depending on the kinetics and mode of bond breaking, the mechanism can be either SN1 or SN2 reaction. The rate of SN1 reaction is governed by the stability of carbocation and in SN2 reaction, the rate of reaction is governed by steric factor. Chirality is the main factor in both SN1and SN2. In SN1 reaction, the chirality of alkyl halide is accompanied by racemization of the product, while in SN2 reaction, the product is characterized by inversion of configuration. The structure of alkyl halide and the nature of the solvent also governs the mechanism of the substitution.
Which of the following bromo isomer of butane will react at a faster rate towards SN2 reaction?

Name the reagent required to convert cyclohexene into hexane-1, 6-dioic acid.

The radius of curvature of each surface of a double convex lens is 15 cm and the refractive index of the medium of the lens is 1.5. What is the focal length of the lens?

Match List I with List II

LIST - I	LIST - II
A. Cubic cell	I. \(\alpha=\beta=\gamma=90^{\circ}\)
B. Monoclinic cell	II. \(\alpha=\beta=90^{\circ}, \gamma=120^{\circ}\)
C. Triclinic cell	III. \(\alpha=\gamma=90^{\circ}, \beta \neq 90^{\circ}\)
D. Hexagonal cell	IV. \(\alpha \neq \beta \neq \gamma \neq 90^{\circ}\)

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The brain size of the Neanderthal man was:

Which one of the following ligands forms a chelate?

A moving charge produces :

Gause's 'Competitive Exclusion Principle' states that -