AIEEE 2010 | Chemical Kinetics and Nuclear Chemistry Question 194 | Chemistry

The time for half life period of a certain reaction A $$\to$$ products is 1 hour. When the initial concentration of the reactant ‘A’, is 2.0 mol L^–1, how much time does it take for its concentration to come from 0.50 to 0.25 mol L^–1 if it is a zero order reaction ?

4 h

0.5 h

0.25 h

1 h

AIEEE 2009

MCQ (Single Correct Answer)

-1

The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2=0.301) :

230.3 minutes

23.03 minutes

46.06 minutes

460.6 minutes

AIEEE 2008

MCQ (Single Correct Answer)

-1

For a reaction $${1 \over 2}A \to 2B$$ rate of disappearance of ‘A’ is related to the rate of appearance of ‘B’ by the expression

$$ - {{d[A]} \over {dt}}$$ = $${1 \over 2}{{d[B]} \over {dt}}$$

$$ - {{d[A]} \over {dt}}$$ = $${1 \over 4}{{d[B]} \over {dt}}$$

$$ - {{d[A]} \over {dt}}$$ = $${{d[B]} \over {dt}}$$

$$ - {{d[A]} \over {dt}}$$ = $$4{{d[B]} \over {dt}}$$

AIEEE 2007

MCQ (Single Correct Answer)

-1

A radioactive element gets spilled over the floor of a room. Its half-life period is 30 days. If the initial activity is ten times the permissible value, after how many days will it be safe to enter the room?

1000 days

300 days

10 days

100 days

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