Uncertainty in the position of an electron (mass= 9.1 x 10-31 kg) moving with a velocity 300 ms-1 accurate upon 0.001 % will be (h = 6.63 x 10-34 J-s)
19.2 x 10-2 m
5.76 x 10-2 m
1.92 x 10-2 m
3.84 x 10-2 m
An acid solution of pH = 6 is diluted 1000 times, the pH of the final solution becomes
6.01
9
3.5
6.99
When Zn is treated with excess of NaOH, the product obtained is
Zn(OH)2
ZnOH
Na2ZnO2
None of the above
Which of the following species is an electrophile?
H2O
NH3
C2H5OH
SO3
D.
SO3
Electrophiles are electron loving chemical species. These may be either positively charged or electrically neutral species. SO3 can be written as a resonance hybrid of the following structures.
Due to the presence of a positive charge on S, it acts as an electrophile
Which of the following compounds do not give different isomers on monochlorination?
Neo-pentane
n-butane
Iso-butane
Iso-pentane
34.2 g of cane sugar is dissolved in 180 g of water. The relative lowering of vapour pressure will be
0.0099
1.1597
0.840
0.9901
In a multistep reaction, the overall rate of reaction is equal to the
rate of slowest step
rate of fastest step
average rate of various step
the rate of last step
According to Hess's law, the heat of reaction depends upon
initial condition of reactants
initial and final conditions of reactants
intermediate path of the reaction
end conditions of reactants