Recently Active Chemistry Questions

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when Fe(s) is dissolved in aq HCl in a closed vessel, the work done is? positive,negative or 0?? and why? ...

1. Among the following, the surfactant that will form micelles in aq. solution at the lowest molar concentration and ambient conditions is a) CH3(CH2)15N+(CH3)3Br- b) CH3(CH2)11OSO-3Na+ c)CH3(CH2)6 COO-Na+ d) CH3(CH2)11N+(CH3 ...

A first order reaction,A --->B,requires activation energy of 70 kJ/mol.When a 20 % solution of A was kept at 25oC for 20 minutes,25 % decomposition took place. What will be the percent decomposition in the same time in a 3 ...

The nucleidic ration,3H1 to 1H1 is 8.0 x 10-18:1.Tritium undergoes decay with the half life period of 12.3 yrs.How many tritium atoms would 10g of such a sample contain 40 yrs after original sample is collected ? ...

Which of the following alloys contain(s) Cu and Zn ? A. Bronze B. Brass C. Gun metal D. Type metal According to me ans should be B,C.. but fiitjee has given A,B,C.Pls confirm. ...

Q)→Match the column tell the (t) option in column B corresponds to which options in column A column A column B A) B2 B) N2 (t) Mixing of 's' and 'p' orbitals. C) O2- D) O2 [pls give the satisfactory explanation for ur answe ...

Which compound does not dissolve in hot dil HNO3 ? A. HgS B. PbS C. CuS D. CdS ...

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ALKALI METALS (specially for anand) (IIT syll: Oxides, peroxides, hydroxides, carbonates, bicarbonates, chlorides and sulphates of sodium, potassium, magnesium and calcium) Alkali and alkaline earth metal hydroxides Solubilit ...

For a negatively charged colloidal solution, the flocculation value of electrolyte is minimum in case of 1. Potassium citrate 2. Potassium formate 3.Potassium acetate 4. All have equal value ...

*Image* *Image* ----HI ----> MORE THAN 4 MOLES OF HI WILL BE CONSUMED TRUE / FALSE ...

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1.a plot of gibbs energy vid extent of reaction has a)a minimum at equilibirium b) a max at equilibirium c) + slope at eq d) - slope at eq 2. if half life of a reactant decreases wen temp is changed from T1 to T2 a) it is exo ...

With the time left now fir jee 2010 ....i must do only ncert na for (11 & 12 ) ...for inorganic/?? to get atleast average score in inorganic? ...

Xenon is in sp3 hybridisation in 1. XeO4 2. XeF4 3. XeO3 4. XeO2 a) 2,4 b) 1,2 c) 1,2,3 d) 2 ...

Q1 K2Cr2O7 +H2SO4(hot)→ Q2 K2Cr2O7 +H2SO4(cold)→ Q3 K2Cr2O7 +H2SO4(room temperature)→ Q4 Hydrated FeCl3 + Stream of air(high tempearture)→ Q5 Ferric oxide +HCl → Q6 Na2CrO4 +C +heat → Q7Mixture of KCr2O7 and conc ...

Write down the half reactions and cell reaction for Daniel cell. Zn (S)| Zn+2 (aq) (IM) || Cu+2 (aq) (IM) |Cu(S) ...

For ideal gas PV=nRT, Z = PV/nRT for real gas (P + na/v2 )(V - nb)=nRT Ideal gas can't be liquified by applying any pressure and temperature. Q) For one mole of ideal gas ( dP/dT )v( dV/dT )p( dV/dP )T = ? A) - R2/P2 B)- R/P2 ...

Three 1L bulbs shown.Bulb A contains a mixture of H2O,CO2,N2 at 25C (All in gaseous state) and total presure 564 mm of Hg.Bulb B i sempty and at temp -70 C.Bulb C is also empty and at temp of -190 C. CO2 sublimes at -78 C and ...

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1) An oxy-acid of phosphorous is prepared by hydrolysis and oxidation of red P by NaOCl or yellow P by H2 O and air . What is the basicity of the oxyacid ? Ans 4 ...

*Image* why are they inverting the molecule in sawhorse presentation?????can anyone explain???? ...

1.what methods can be used to distinguish between cis and trans isomers of an complex???? ...

1...among the following C-O bond order is lowest in : (a)[Mn(co)6]+ (b)[Fe(co)5] (c) [Cr(co)6] (d)[V(co)6] 2..why Cr3+ never forms tetrahedral complexes even if V3+, Fe3+ form ???????? 3.. hich can xists as disastereomers ??? ...

wht is the ratio of molecular wieght of phenol : equivalent weight of phenol answer : 6 how many alpha Hydrogen are needed in claisen condensation answer 2 plz explain!! ...

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1) How many number of possible condensation products are obtained when proponal and propanone are together treated with moderately concentrated alkali ? ...

Q1. Which contains both polar and non-polar bonds? (a) NH4Cl (b) HCN (c) H2O2 (d) CH4 Q2. Spin magnetic moment in BM of Hg[Co(SCN)4] is (do we consider S as donor atom or N?) Q3. Ionic radii of (a) Ti4+<Mn7+ (b) 35Cl- < ...