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
The electrolyte having maximum flocculation value for AgI/Ag+ sol is
NaCl
Na2S
Na2SO4
Na3PO4
A.
NaCl
According to Hardy - Schulze rule. Flocculation value (FV)∝.
Since, coagulationg power is direct us related to valences of coagulating ion.
Thus, FV ∝ .
Hence, greater the valency of coagulating ion, lower will be the flocculating value and vice versa. As for the given positively charged sol, negative ion would be required for coagulation thus, for the given amons the coagulation power will be PO< SO= S2- < Cl- or flocculating but coagulating value would be in an order of Cl- > S2- = SO>PO.Hence, NaCl will have the maximum flocculating value for the given positively charged sol.
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
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)