A 000 g sample of live grass gives 116 decays per hour of carbon-1 A 0 – McqOptions

MCQOPTIONS

1.	A 000 g sample of live grass gives 116 decays per hour of carbon-1 A 000 g sample of grass found in an Egyptian tomb gives 34 decays per hour. The half-life of carbon-14 is 5720 years. How old, in years, is the ancient grass?
A.	19500
B.	1680
C.	10100
D.	7020
Answer» D. 7020

Discussion

No Comment Found

Related MCQs

In a reaction, A + B → Product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled, rate law for the reaction can be written as
In the hydrolysis of an organic chloride in presence of large excess of water, RCl + H2O → ROH + HCl
The rate of a chemical reaction doubles for every 10°C rise of temperature. If the temperature is raised by 50°C, the rate of the reaction increases by about
In a zero-order reaction for every 10° rise of temperature, the rate is doubled. If the temperature is increased from 10°C to 100°C, the rate of the reaction will become
The activation energy of a reaction at a given temperature is found to be 303 RT J mol– The ratio of rate constant to the Arrhenius factor is
The rate equation for a reaction: A → B is r = K [A]°. If the initial concentration of the reactant is a mol dm–3, the half life period of the reaction is
The time required for 100% completion of a zero order reaction is
Radioactivity of a sample (z = 22) decreases 90% after 10 years. What will be the half-life of the sample?
In a chemical reaction, only those collisions of molecules are effective in which the colliding molecules possess a minimum amount Of energy called?
When one of the products of reaction acts, as catalysts then 'such a process is called?