For a chemical reaction, mA → xB, the rate law is r = k[A]2. If the concentration of A is doubled, the reaction rate will be
doubled
quadrupled
increases by 8 times
unchanged
Schottky defect in a crystal is observed, when
unequal number of cations and anions are missing from the lattice
equal number of cations and anions are missing from the lattice
an ion leaves its normal site and occupies an interstitial site
no ion is missing from its lattice site
The activation energy of a chemical reaction can be determined by,
evaluating rate constants at two different temperatures
changing the concentration of reactants
evaluating the concentration of reactants at two different temperatures
evaluating rate constant at standard temperature
Which of the following statements is incorrect with respect to physisorption?
The forces involved are van der Waals' forces
More easily liquefiable gases are adsorbed easily
Under high pressure it results into multimolecular layer on adsorbent surface
Hadsorption is low and positive
Sulphur sol contains
discrete S-atoms
discrete S molecules
large aggregates of S molecules
water dispersed in solid sulphur
van-Arkel method of refining zirconium involves
removing all oxygen and nitrogen impurities
removing CO impurity
removing hydrogen impurity
removing silica impurity
The composition of "copper matte" is
Cu2S + FeS
Cu2S + Cu2O
Cu2S + FeO
Cu2O + FeS
A.
Cu2S + FeS
Copper-matter is a mixture of Cu2S and FeS.
The complex formed when Al2O3 is leached from bauxite using conc. NaOH solution is,
Na[Al(OH)4]
NaAl2O4
Na[Al(OH)3]
Na2AlO2