Related Questions

The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then
A $${\frac{3}{4}^{{\text{th}}}}$$ of it will disintegrate in two months
B It will completely disintegrate in two months
C It will completely disintegrate in four months
D $${\frac{l}{8}^{{\text{th}}}}$$ of it will remain intact at the end of four months
A man sells chocolates which are in the boxes. Only either full box or half a box of chocolates can be purchased from him. A customer comes and buys half the number of boxes which the seller had plus half box more. A second customer comes and purchases half the remaining number of boxes plus half a box. After this the seller is left with no chocolate boxes. How many chocolate boxes the seller had initially?
A 2
B 3
C 4
D 3.5
E None of these
The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of __________ order.
A Zero
B First
C Second
D None of these
The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is
A 0.875
B 0.5
C 0.425
D Data insufficient to calculate
The half life period of a first order reaction is
A Always the same irrespective of the reaction
B Dependent on initial concentration of the reactants
C Proportional to the initial concentration of reactants
D Half the specific rate constant
Half life period of a first order irreversible reaction A → B is
A $$\frac{{\text{k}}}{2}$$
B $$\ln \frac{{\text{k}}}{2}$$
C $$\ln \frac{2}{{\text{k}}}$$
D $$\ln \frac{{{\text{0}}{\text{.5}}}}{{\text{k}}}$$
Half-life period for a first order reaction is __________ the initial concentration of the reactant.
A Directly proportional to
B Inversely proportional to
C Independent of
D None of these
For a __________ order reaction, the units of rate constant and rate of reaction are the same.
A Zero
B First
C Second
D Fractional
What is the order of a chemical reaction in which doubling the initial concentration of the reactants doubles the half life time of the reaction?
A 0
B 1
C 2
D 3
In order to have constant chain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be
A Greater than 1.0
B Less than 1.0
C Equal to zero
D Equal to 1.0

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