Recently Active Chemistry Questions

The compounds used as refrigerant are -- (A). NH3 (C). CF4 (B). CCl4 (D). CF2Cl2 (E). CH2F2 A is one correct option ...

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1. A substance A decomposes by first order reaction starting initially with [A] = 2.00 M, after 200mins [A] = 0.250 M. For this reactioin what is I + 1/2 II K? 2. Calculate the equilibrium const. for the reaction Fe+2 + Ce+4 ...

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wht is the hybridisation of boron in borax? ...

1. Statement-I : The sum of mole fraction of all the components of a solutioin is unity. Statement-II : Mole fraction is temperature dependent. 2. Statement-I : Decrease in free energy comes spontaneons reaction. Statement-II ...

Explain tetrahedral Ni (II) complexes are Paramagnetic but squaire planar Ni (II) complexes are diamagnetic. ...

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1/ Which of the following metals have both valence and penultimate shell partially filled A. Cr B.Mo C.Cu D.Zn 2/ Which wil give ammonia with water A. Mg3N2 B.AIN C.CaCN2 D.Ca(CN)2 ...

ncert question hai.....pahli baar kitab kholi hai....[3] Cobalt(II) is stable in awueous soln but in presence of complexing reagents,it is completely oxidised.why?? thread closed ...

1. If an electrolytic solution is diluted to 9 times then its conductance a) Inc. 9 times b) Dec. 9 times c) Remains same d) none 2. 4 M + 8 CN^– + 2H2O + O2 → 4 [M(CN)2 + 4OH– the metal M is (A) Ag (B) Fe (C) Cu (D) Zn ...

Single Option Correct. 1) Electron Affinity is +ve when- A) O- is formed from O. B) O 2- is formed from O-. C) O+ is formed from O. D) Electron Affinity is always negative. 2)Of the 4 ∂H values needed to calculate the latti ...

Azide ion exhibts an N-N bond order of 2 and may be represented by resonance structures,I,II,III given below *Image* which of the above structures will contribute more to the resonance hybrid ...

*Image* I think the ans should be B) but it is not the ans. Please if any one knows tell me. ...

What is the molality of 15% solution of H2SO4 by mass?? ...

Q1. STMNT 1: Order of a reaction cannot be determined from balanced stoichiometric equation STMNT 2: Order may not be equal to molecularity Q2. STMNT 1: One mole of CO2 occupies 0.4 L at 300 K and 40 atm STMNT 2: CO2 is more ...

Why does only Cu2+ form precipitate by passing H2S gas through an acidified solution but not Zn2+? ...

Q1. Which of the following isomers of dichlorocyclohexane are optically active? (a) 1,1 dichloro (b) 1,2 (cis) dichloro (c) 1,2 (trans) dichloro (d) 1,3 (cis) dichloro (e) 1,3 (trans) dichloro (f) 1,4 (cis) dichloro (g) 1,4 ( ...

An SN2 reaction at an asymmetric Carbon of a compound always gives a) An enantiomers of the substrate b) A product with opposite optical rotation c) A mixture of diastereomers d) Single stereoisomer ...

Q1 If ΔHionisation (HCN)=45.2 kJ/mol and ΔHionisation (CH3COOH)=2.1 kJ/mol.Then whats relation ship between pKa of both ?? I am getting pKa(HCN)=45.2/2.1 pKa(CH3COOH) Q2 Find change in deg of disociation be addn of 8.2 gm o ...

1. Which of the following statement regarding the SN1 reaction shown by alkyl halide is not correct? a) (The added nucleophile plays no kinetic role in SN1 reaction.) b) (The SN1 reaction involves the inversion of configurati ...

1.arrange in order of Increasing ionic size.. Na+, Mg2+, Al3+, F- 2.arrange in order of Increasing first ionization enthalpy B , C , N, O ...

1. Which of the following act as antiseptic ? a) Iodine b) Penicilline c) Morphine d) Bithional 2> Which of the following compounds are covalent a) CaCl2 b) CaO 3) HCl d) CO2 3. Which of the following are polyster a) Bakel ...

1. CH3 —CH—CONH2 | CH3 2. CH3 —CH2 —CH–CH2 —CH3 | COOH 3. Cl | CH3 —CH2 —C= CH–CH3 ...

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1.CH3CH2Br (catalyst -aq. NaOH) ----> [A] +(catalyst- K2Cr2O7 H2SO4) ---------> [B] 2. (CH3COO)2 Ca (heat)------>[A]+ (catalyst - Zn/ HCl) ----->[B] ...

1. Phenol to toluene 2. Benzene to aniline 3. Phenol to salicyldehyde ...

ETHENE ON OXIDATION WITH O2 (IN PRESENCE OG Ag2O )GIVES A.EPOXYMETHANE B.ETHYLENE OXIDE C.OXIRANE ...

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0.1M Cr2O72- will be better oxidisng reagent for ? a)10 ml 1M CH3COOH +10 ml 1M NH4OH b)100 ml 0.1M NaOH +100ml 0.1M HCl c)50ml 0.1M HCl d)100ml 10-7M HCl do we have to use nernst eqn here ?? ...