The product obtained as a result of a reaction of nitrogen with CaC2 is
CaCN
CaCN3
Ca2CN
Ca2CN
D.
Ca2CN
When calcium carbide reacts with nitrogen under high temperature, it forms calcium cyanamide which is also called nitrolim.
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
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