A sample of radioactive substance with half-life of 3 days was found to contain only 3g of it, when received exactly 12 days after sealing.The amount of the radeioactive substance when it was sealed, was :
Which one of the following pairs of substances will not produce hydrogen when reacted together?
For the datathe Karl Pearson coefficient is
The force between two magnetic poles is F. If the distance between the poles and the pole strenghts is doubled, then the force experienced is:
A spring of force constant k is cut into two pieces such that one piece is double the length of the other. The force constant of the longer piece will be
If vector a = i + 2j + 3k and b = i × (a×i) + j×(a×j) + k×(a×k) then length of b is equal to
Which of the following organic compounds has same hydridization as it's combustion product- {tex}(CO_2){/tex} ?
At a certain temperature, the dissociation constants of formic acid and acetic acid are 1.8 x 10-4 and 1.8 x 10-5 respectively. The concentration of acetic acid solution in which the hydrogen ion has the same concentration as in 0.001 M formic acid solution is equal to
If vectors a, b, c are non zero, non coplanar vectors, then (c x a) x (a x b) is
Oxidation states of P in {tex}H_4 P_2 O_5, H_4 P_2 O_6, H_4 P_2 O_7{/tex} are respectively.
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