The colour of \(\left[ Ni \left( NO _2\right)_6\right]^{4-}\) complex is ______________

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Haloalkanes undergo nucelophilic substitution reactions owing to the polarity of C X 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.
What is chiral carbon ?

Identify the correct statements for Ethylene dichloride and Ethylidene chloride
(A) They represent structural isomers.
(B) Both are formed by reaction of ethene with chlorine in presence of\(CCl _4\)
(C) Both the compounds belong to a class of dihalocompounds
(D) Both the compounds are optically inactive.
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Decide which of the following atomic numbers are the atomic numbers of the inner transition elements
(A) 59
(B) 95
(C) 102
(D) 74
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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) \(NH_{2}CONH_{2}\)
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The correct statement (s) for cubic close packed (ccp) three dimensional structure are :
(A) The number of the neighbours of an atom present in the top most layer is 12.
(B) The efficiency of atom packing is \(74\%\).
(C) The number of octahedral and tetrahedral voids per atom are 1 & 2, respectively.
(D) The unit cell edge length is \(2\sqrt{2}\) times the radius of the atom.
(E) The metals like Be, Cd, Mg, Zn have cubic close packed (ccp) structure.
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Match List-I with List-II

List-I	List-II
(A) Adenine	(I) Purine
(B) Thymine	(II) Pyrimidine
(C) Uracil	(III) DNA
(D) Deoxyribose	(IV) RNA

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Which of the following statement is NOT correct?
(A) Copper liberates hydrogen from acids.
(B) In its higher oxidation states Manganese forms stable compounds with oxygen and fluorine.
(C) \(\text{Mn}^{3+}\) and \(\text{Co}^{3+}\) are oxidising agents in aqueous solution.
(D) \(\text{Ti}^{2+}\) and \(\text{Cr}^{2+}\) are reducing agents in an aqueous solution.
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Which of the followings were dominant during the 'Jurassic' period?
(A) Ferns
(B) Seed ferns
(C) Conifers
(D) Dinosaurs
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The vector equation of the plane which is at a distance of 6 units from the origin and has \(2,-1,2\) as the direction ratios of normal to it, is :

\(\text{C}_3\text{H}_6\text{O}\) does not form a silver mirror with Tollen's reagent but forms an oxime with hydroxylamine. It can give positive:

An aeroplane having a wing span of 40 m flies due north at a speed of \( 100 \, \text{m s}^{-1} \) in magnetic field \( 5 \times 10^{-5} \, \text{T} \) acting vertically downward. The potential difference between the tips of the wings is

Match List - I with List - II.

List - I (Organism)	List - II (Sex chromosomes)
(A) Male grasshopper	(I) XY
(B) Male Drosophila	(II) ZX
(C) Female bird	(III) XX
(D) Female grasshopper	(IV) XO
	(V) ZW

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