Recently Active Chemistry Questions

Assuming that deviation from standard conditions is unimportant in this case and that all these redox reactions go essentially to completion. Given: [Zn(CN)4]2- + 2 e- ------- Zn + 4 CN- E = -1.26 V [Au(CN)2]- + e- -------- A ...

A sample containing H3PO4 and P4O10 is labelled in the analogous manner as oleum. The mass of P4O10 in a sample labelled as 127%, would be ? ...

The vapor pressure lowering of 0.1M aqueous solution of non electrolyte at 75° C is ? ( ΔHv of water =9720 cal/mol and antilog 0.407=2.55) ...

A)NH3+NaOCl→ p)N2H4 B)NH4NO2+NaOH→ q)N2 C)NH4NO3+Ca(OH)2→ r)NH3 D)(NH4)2Cr2O7→ s)H2O in all reactions heating is done. ...

Q1 The closest distance b/w 2 atoms among these unit cells (assuming edge length =a in eache cell) a)diamond b)FCC Q2 When NH4Cl is dissolved in H2O ,the temp of H2O decreases hten a)ΔHs>0,ΔHi<ΔHh b)ΔHs<0,ΔHi< ...

*Image* answer should be b,c both na.....???? ...

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*Image* yaar i m getting answer as 2(H1-H2)*Navogadro/N0 but answer given is 2(H2-H1)*Navogadro/N0......... wat is correct me or book???? ...

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a set of orbitals is called degenrate if they have same wave functions....true /false? ...

Out of the following, the correct option about the stability of given complexes 1. NiCl4-2 > PtCl4-2 2.PdCl42-> PtCl42- 3. [Ni(CO)4] = [Ni(CN)4]-2 4.PtCl4-2> PdCl4-2 ...

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Molar heat capacity of water in equilibrium with ice at constant pressure is (A) zero (B) infinity (C) 40.45 kJ K-1 mol-1 (D) 75.48 kJ K-1 mol-1 ...

The following is/are endothermic reaction(s) : (A) Combustion of methane (B) Decomposition of water (C) Dehydrogenation of ethane to ethylene (D) Conversion of graphite to diamond. ...

RCM (28) A heat pump is used to draw water from a well.The temperature of the water is 15°C and that of the atmosphere is 40°C.If the amount of water drawn is 10kg through a depth of 12m, calculate the amount of heat suppli ...

Q1 if tehre were three possible values (-1/2,0,1/2) for spin quantum number s,then the number of elements in fourth preiod of periodic table would be ? Q2 what indiactor is uded fr titration of 0,1 M KH2BO3 and 0.1M HCl ? (an ...

1. Does Fehling’s solution oxidize Benzaldehyde? Or it oxidizes aliphatic aldehydes only? 2. .Aldehyde when reacts with fehling Solution gives a) white ppt b) red ppt c) green ppt d) blue ppt 3. Which of the following gives ...

Which of the following aqueous solution of cation (s) gives (s) white ppt. with NaOH and 4 NH OH solution and formed ppt. is/are further completely dissolved in one of the excess reagent a) Cd2+ b) Cr3+ c) Sn2+  d) B ...

What is the effect of pressure on melting pt of ice? Shouldnt an increase in pressure increase the melting point? having a great controversy over this!plz answer. ...

plzzzzzzzzzzzzz can anyone give the download link for j d lee!!!!!! ...

Col - I a) Fries Rearrangement b) Elbs Persulphate Oxidaton c) Coupling Reacn. d) Pthalein Reacn. Col-II p) Resorcinol+Pthalic (Anhydride) in presence of cons.H2SO4 givng Fluorescein q) Phenyl Ethanoate an presence of AlCl3 g ...

PdSO4 and BaSO4 are insoluble in ____ and ___ ? ...

Name the compound which can be used in space vehicles both to absorb carbon dioxide and liberate oxygen ...

A very basic doubt everybody,still rectify. what's caustic potash,KOH isnt it. it was referred to in a question on identification and in answer booklet KCN has been used in it's place! ...

1)Calculate the value of Avogadro constant from the internuclear distance of adjacent ion in NaCl is 0.282 nm and the density of soild NaCl formula units is 2.17 × 103 kg/m3 2) From the following standard electrode potential ...

Good Obj. Qn(s)... Needed to clarify & verify my answers, 'coz i don't have the list of correct ones. SINGLE ANSWER CORRECT *Image* *Image* MULTIPLE ANSWERS CORRECT *Image* Do post the answers u all got. ...

1.)order of heat of hydrogenation: a)1-hexene b)2-hexene c)3-hexene d)1-cyclo-hexene 2.)order in which they wil ract with H+: *Image* ...

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l2 + S2O3^2– ----------------> ...

Q) Hydroxide ion catalyses the reaction of piperdine with 2,4 - dinitroanisole but has no effect on the reaction of piperdine with 1-chloro , 2.4- dinitrobenzene. Explain why hydroxide ion acts as a catalyst in one reaction b ...