Multiple Choice Questions1.0 g of magnesium is burnt with 0.56 g of O2 in a closed vessel. Which reactant is left in excess and how much?
Mg, 0.16 g
O2, 0.16 g
Mg, 0.44 g
Mg, 0.44 g
The pair of compounds that can exist together is
FeCl3.SnCl2
HgCl2,SnCl2
FeCl2,SnCl2
FeCl2,SnCl2
Which of the following molecules has the maximum dipole moment?
CO2
CH4
NH3
NH3
C.
NH3
CO2 and CH4 have zero dipole moment as these are symmetrical in nature. Between NH3 and NF3 , NF3 has greater dipole moment though in NH3 and NF3 both, N possesses one lone pair of electrons.
This is because, in the case of NH3, the net N-H bond dipole is in the same direction as the direction of the dipole of the lone pair but in the case of NF3, the direction of the net bond dipole of three -N-F bonds is opposite the that of the dipole of the lone pair.
Magnetic moment 2.83 BM is given by which of the following ions?
(At. no.: Ti =22; Cr=24; Mn=25; Ni=28)
Ti3+
Ni2+
Cr3+
Cr3+
In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralised 10 mL of 1 M H2SO4.The percentage of nitrogen in the soil is
37.33
45.33
35.33
35.33
Which of the following organic compounds has same hybridization as its combustion product -(CO)2?
Ethane
Ethyne
Ethene
Ethene
(I)H2O2 +O3 --> H2O +2O2
(II) H2O2 +Ag2O +--> 2Ag +H2O +O2
Role of hydrogen peroxide in the above reaction is respectively
oxidising in (I) and reducing (II)
reducing (I) and oxidizing in (II)
reducing in (I) and (II)
reducing in (I) and (II)
The reaction of aqueous KMnO4 with H2O2 in acidic conditions gives.
Mn4+ and O2
Mn2+ and O2
Mn2+ and O3
Mn2+ and O3
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