The acid strength of active methylene group in
I. CH3COCH2COOC2H5
II. CH3COCH2COCH3
III. C2H5OOCCH2COOC2H5
decreases as
I > III > II
I > II > III
II > I > III
III > I > II
A metallic oxide reacts with water to from its hydroxide, hydrogen peroxide and also liberates oxygen. The metallic oxide could be
CaO
KO2
Li2O
Na2O2
A plot of vs k for a reaction gives the slope -1 × 104 K. The energy of activation for the reaction is (Given, R = 8.314 K-1 mol-1)
8314 J mol-1
1.202 kJ mol-1
12.02 J mol-1
83.14 kJ mol-1
MnO2 + HCl A (g)
A (g) + F2 (excess) B (g)
B (l) + U (s) → C (g) + D (g)
The gases A, B, C and D are respectively
Cl2, ClF, UF6, ClF3
Cl2, ClF3, UF6, ClF
O2, OF2, U2O3, O2F2
O2, O2F2, U2O3, OF2
One mole of ammonia was completely absorbed in one litre solution each of
I. 1 M HCl
II. 1 M CH3COOH
III. 1 M H2SO4 at 298 K
The decreasing order for the pH of the resulting solution is (Given Kb (NH3) = 4.74)
II > III > I
I > II > III
II > I > III
III > II > I
C.
II > I > III
Acids which are weak in water will be highly acidic in NH3
(a) HCl + NH3 NH4Cl
(b) CH3COOH + NH3 CH3COONH4
(c) H2SO4 + NH3 (NH4)2SO4
Effect of ammonia is least in H2SO4 and maximum in CH3COOH.
Order of acidic strength of resulting solution is
(NH4)2SO4 > NH4Cl > CH3COONH4
Order of pH of resulting solution is
CH3COONH4 > NH4Cl > CH3COONH4
Hence, correct option is II > I > III.
5.5 mg of nitrogen gas dissolves in 180 g of water at 273 K and 1 atm pressure due to nitrogen gas. The mole fraction of nitrogen in 180 g of water at 5 atm nitrogen pressure is approximately
1 × 10-6
1 × 10-5
1 × 10-3
1 × 10-4
50 cm3 of 0.04 M K2Cr2O7 in acidic medium oxidises a sample of H2S gas to sulphur. Volume of 0.03 M KMnO4 required to oxidize the same amount of H2S gas to sulphur, in acidic medium is
60 cm3
80 cm3
90 cm3
120 cm3
The pair of compounds having identical shapes for their molecules is
CH4, SF4
BCl3, ClF3
XeF2, ZnCl2
SO2, CO2