During nuclear explosion one of the products is 90Sr with half-life of 28.1 yr. If 1 μg of 90Sr was absorbed in the bones of a newly born body instead of calcium, how much of it will remain after 60 yr, if it is not lost metabolically?
0.184 μg
0.025 μg
0.262 μg
0.228 μg
A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as
solid sol
gel
emulsion
sol
In a first order reaction, the concentration of the reactant, decreases from 0.8 M to 0.4 M in 15 min. The time taken for the concentration to change from 0.1 M to 0.025 M is
30 min
15 min
7.5 min
160 min
Calculate the osmotic pressure of 0.01 M solution of cane sugar at 300 K (R = 0.08212 atm degree-1 mol-1)
0.3568 atm
0.2463 atm
0.1562 atm
0.5623 atm
Given, The potential for the cell Cr | Cr3+ (0.1 M) || Fe2+ (0.01 M) | Fe is
0.26 V
0.399 V
-0.399 V
-0.26 V
In a reaction, A + B → C, the rate expression is R = k [A][B]2. If the concentration of both the reactant is doubled at constant volume, then the rate of the reaction will be
eight times
double
quadruple
triple
Concentrated HNO3 forms NO in the presence of
Conc. H2SO4
Fe
FeBr3
AlCl3
A.
Conc. H2SO4
Concentrated HNO3 forms NO+2in the presence of conc. H2SO4.
CH3MgBr + CH2 = CH-COH Product
It is (1 : 4 addition)
CH2=CH-
CH2OH-CH=CH-CH3
CH3CH2CH2CHO
None of the above