21585.Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O?
Ca < Al < C < O < F
Al < Ca < O < C < F
Al < O < C < Ca < F
C < F < O < Al < Ca
21586.In which of the following compounds, nitrogen exhibits highest oxidation state?
N3H
NH2OH
N2H4
NH3
21587.Three reactions involving H2PO–
4 are given below
4 are given below
(i) H3PO4 + H2O → H3O+ + H2PO–
4
(ii) H2PO–
4 + H2O → HPO2–
4 + H3O+
(iii) H2PO–
4 + OH– → H3PO4 + O2–
In which of the above does H2PO–
4 act as an acid?
(i) only
(ii) only
(iii) only
(i) and (ii)
21589.The correct order of increasing bond angles in the following species is
Cl2O < ClO2 < ClO–
2
2
ClO–
2 < Cl2O < ClO2
2 < Cl2O < ClO2
Cl2O < ClO–
2 < ClO2
2 < ClO2
ClO2 < Cl2O < ClO–
2
2
21590.Among the following substituted silicanes the one which will give rise to cross linked silicone polymer on hydrolysis is
R4Si
RSiCl3
R2SiCl2
R3SiCl
21591.Which of the following statements regarding ozone is not correct?
The oxygen–oxygen bond length in ozone is identical with that of molecular oxygen
The ozone is response hybrid of two structures
The ozone molecule is angular in shape
Ozone is used as a germicide and disinfectant for the purification of air.
21592.Which of the following contains P – O – P bond?
Hypophosphorous acid
Phosphorous acid
Pyrophosphoric acid
Orthophosphoric acid
21593.In which of the following arrangements, the sequence is not strictly according to the property written against it?
CO2 < SiO2 < SnO2 < PbO2 : Increasing oxidizing power
HF < HCl < HBr < HI : Increasing acid strength
NH3 < PH3 < AsH3 < SbH3 : Increasing basic strength
B < C < O < N : Increasing first ionization enthalpy
21595.The pair of species that has the same bond order in the following is:
O2, B2
CO, NO+
NO–, CN–
O2, N2
21596.Regular use of which of the following fertilizers increases the acidity of the soil?
Ammonium sulphate
Superphosphate of lime
Urea
Potassium nitrate
21597.One mole of magnesium nitride on the reaction with an excess of water gives:
one mole of ammonia
one mole of nitric acid
two moles of ammonia
two moles of nitric acid
21598.The reaction of P4 with X leads selectively to P4O6. The X is
Dry O2
A mixture of O2 and N2
Moist O2
O2 in the presence of aqueous NaOH
21599.Which of the following statements is not valid for oxoacids of phosphorus?
All oxoacids contain tetrahedral four coordinated phosphorus
All oxoacids contain at least one P = O unit and one P – OH group
Orthophosphoric acid is used in the manufacture of triple superphosphate
Hypophosphorous acid is a diprotic acid
21600.When conc. H2SO4 is heated with P2O5, the acid is converted into
sulphur
sulphur dioxide
sulphur trioxide
a mixture of sulphur dioxide and sulphur trioxide
21601.Density of carbon monoxide is maximum at
2 atm and 600 K
0.5 atm and 273 K
6 atm and 1092 K
4 atm and 500 K
21602.Among the halogens, the one which is oxidised by nitric acid is:
Chlorine
Bromine
Fluorine
Iodine
21603.Sulphur trioxide can be obtained by which of the following reaction
S + H2SO4 $\xrightarrow{\;\;\triangle\;\;}$
H2SO4 + PCl3 $\xrightarrow{\;\;\triangle\;\;}$
CaSO4 + C $\xrightarrow{\;\;\triangle\;\;}$
Fe2(SO4)3 $\xrightarrow{\;\;\triangle\;\;}$