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level: chemistry

Questions and Answers List

level questions: chemistry

Question	Answer
2 chorobutane on reaction with H2O gives	[+-]-2-butanol
reagent used for dehydrohalogenation of alkyl halide is	alc. KOH
vapour density remains unchanged on dissociation	2 NO[g]<-------> N2[g] + O2[g]
the hybridisation of orbitals of central atom in [Be[OH]4]-2 and the geometry of the complex are respectively	sp2, tetrahedral
B2H6 is	e- deficient and diamagnetic
correct order of stability of Pb+2, Sn+2,Ge+2 is	Pb+2>Sn+2>Ge+2
when orthoboric acid (H3BO3) is strongly heated, the residue left is	boric anhydride
H2C2O4 with conc. H2SO4 -------> A +B... where A is neutral gas and B acidic gas	CO,CO2
during manufacture of steel by bessemer process, lining of silica bricks is used to remove impuritiy of	MnO2
which most reactive towards electrophilic substitution reaction	one methyl benzenamines
if the bond dissociation energies of X,Y,X2 and Y2 are in the ratio of 1:1:0.5 and deltafH for the formation of XY is -200KJ mol-1. the bond dissociation energy of X2 will be	800 KJ/mol
in the following reaction: XA----->YB log[-d(A)/dt}=log{d(B)/dt}+log2 where negative sign indicates rate of disappearance of the reactant. thus X:Y is;	2:1
value of (r+ + r-) for CsCl crystal will be	root 3/2 a
N2H4 bond length is x and N2F4 bond length is y x and y are (N-N) bond length then:	x>y
which of the following does not decolourise iodine	NaCl
the heat of combustion of C4H10 is -2878 KJ/mol. if the heats of formation of CO2 and H2O are -393.5 KJ/mol and -285.8 KJ/ mol then the heat of formation of C4H10 is	-125.0 KJ/mol
identify the correct statement in relation with the following reaction Zn + 2HCl -------> ZnCl2 + H2	Zn is acting as reductant
for an ideal gas, the compressibilty factor (Z) is	Z=1
the atomic radius of strontium(Sr) is 215 pm and it crystallises in cubic closed packed structure. the edge length of cube is	608.2 pm
lyophilic colloidal solution can be coagulated by	-addition of high concentration of electrolyte -by addition of solvent like C2H5OH
the O-N-O angle is maximum in	NO2+
total number of antibonding and bonding electrons present in O2 will be	16
which of the following is highly soluble in H2O	LiCl
when Na react with NH3 gas at 360 degree C, the gas evolved is	H2
the suspension of slaked lime in water is known as	millk of lime
which reaction of xenon compound is not feasible	XeO3+6HF -------> XeF6 + 3H2O
the purest and thermodynamically most stable allotrope of carbon respectively is	fullerenes, graphites
a colourless sol.(A) gives black ppt. on passing H2S. (A) also gives a white ppt. with SnCl2 which gradually changes to grey. identify(A)	HgCl2
carbon donor ligards are strong ligands and usually from low spin complexes. among the complexes given below, select the high spin complex	[Fe(H2O)6]+3
which of the following has B-glycosidic linkage	lactose
The uncertainties in the velocities of two particles, A and B are 0.05 and 0.02 ms–1, respectively. The mass of B is five times to that of the mass of A. What is the ratio of uncertainties left( {delta Xa/deltaXb} in their positions ?	2
For saturated solution of Ag2CrO4 at infinite dilution (λ∞m)Ag+ = 127 ohm–1 cm2 mol–1 and {(lambda _m^infty )_{CrO_4^{ - 2}}} = 273 ohm–1 cm2 mol–1 respectively and specific conductance of solution is 2 × 10–2 ohm–1 cm–1 ; calculate solubility product of Ag2CrO4 :-	2 * 10^-4
which of the following is correct for the reaction 3X---->X3	alpha= 3/2 (1-i)
P molal solution of a compound in benzene has mole fraction of solute is 0.2. The value of "P" is	3.2
which of the following does not follow EAN rule	[Mn(CO)6]
Product obtained by oxidative ozonolysis of isobutylene is :-	CH3COCH3 + CO2 + H2O