The product obtained as a result of a reaction of nitrogen with CaC2 is
CaCN
CaCN3
Ca2CN
Ca2CN
Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?
Cl2>Br2>F2>I2
Br2>I2>F2>Cl2
F2>Cl2>Br2>I2
F2>Cl2>Br2>I2
Lithium has a bcc structure. Its density is 530 kg m-3 and its atomic mass is 6.94 g mol-1. Calculate the edge length of a unit cell of lithium metal. (NA = 6.02 x 1023 mol-1).
352pm
527pm
264pm
264pm
Which of the following statements about the composition of the vapour over an ideal 1:1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at 250C.
(Given, vapour pressure data at 250C benzene = 12.8 kPa, toluene = 3.85 kPa)
The vapour will contain a higher percentage of toluene
The vapour will contain equal amounts of benzene and toluene
Not enough information is given to make a prediction
Not enough information is given to make a prediction
The rate of a first-order reaction is 0.04 mol L-1s-1 at 10 sec and 0.03 mol-1L-1 s-1 at 20 sec after initiation of the reaction. the half-life period of the reaction is
34.1 s
44.1 s
54.1 s
54.1 s
The ionic radii of A+ and B- ions are 0.98 x 10-10 m and 1.81 x10-10 m. The coordination number of each ions in AB is
4
8
2
2
D.
2
Given, ionic radius of cation (A+) =0.98 x 10-10m
Ionic radius of anion (B-)=1.81 x 10-10m
therefore,
The coordination number of each ion in AB =?
Now we have.
If radius ratio range is in between 0.441-0.732 ion would have an octahedral structure with coordination number six.
Which of the following has longest C-O bond length? (free C-O bond length in CO is 1.128 A0)
[Co(CO)4]-
[Fe(CO)4]-2
[Mn(CO)6]+
[Mn(CO)6]+
Among the following, the correct order of acidity is
HClO<HClO2<HClO3<HClO4
HClO2<HClO<HClO3<HClO4
HClO4<HClO<HClO <HClO3
HClO4<HClO<HClO <HClO3
The pressure of H2 required to make the potential of H2-electrode zero in pure water at 298 K is
10-12 atm
10-10 atm
10-4 atm
10-4 atm