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
Red lead is
PbO
Pb3O4
PbO2
Pb4O3
B.
Pb3O4
Pb3O4 or PbO2.2PbO is called red lead.
CH3MgBr + CH2 = CH-COH Product
It is (1 : 4 addition)
CH2=CH-
CH2OH-CH=CH-CH3
CH3CH2CH2CHO
None of the above