On heating with concentrated NaOH solution in an inert atmosphere of CO2 white phosphorus gives a gas. Which of the following statement is incorrect about the gas?
It is less basic than NH3
It is more basic than NH3
It is highly poisonous and has smell like rotten fish
Its solution in water decomposes in the presence of light
Sodium metal crystallises in bee lattice with edge length of 4.29 Å. The radius of sodium atom is
2.857 Å
1.601 Å
2.145 Å
1.857 Å
In a first order reaction, the concentration of the reactant is reduced to 12.5% in 1hr. When was it half completed?
3hr
20min
30min
15min
Copper is extracted from copper pyrites by heating in a Bessemer converter. The method is based on the principle that
copper has more affinity for oxygen than sulphur at high temperature
iron has less affinity for oxygen than sulphur at high temperature
copper has less affinity for oxygen than sulphur at high temperature
sulphur has less affinity for oxygen at high temperature
Which of the following will be able to show geometrical isomerism?
MA3B - Square planar
MA2B2 - tetrahedral
MABCD- saquare planar
MABCD- tetrahedral
C.
MABCD- saquare planar
Tetrahedral complexes do not show geometrical isomensm because relative position of unidentate ligands attached to central metal atom are same with respect to each other .So, options (b) and (d) are not correct.
Square planar complex MA3B (option (a) do not show geometrical isomerism because the possible spatial arrangement are equivalent. Squar planar complex MABCD type form three isomers (cs-transisomerism ), two of these are cis and one is trans.
The electronic configuration of Gd2+ is (atomic number of Gd is 64).
[Xe]4f8
[Xe]4f7
[Xe]4f7 5d16s2
[Xe]4f7 5d1
In H2-O2 fuel cell the reaction occurring at cathode is
2H2 (g) + O2 → 2H2O(l)
O2(g) + 2H2O(l) + 4e- → 4OH-(aq)
H+ +e- → 1/2H2
H+(aq) + OH- → H2O(l)