Chemical Kinetics

Chemical Kinetics is a Science & Technology concept from the MPSC syllabus, tested in 3 past MPSC questions (2016, 2021, 2024). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.

Real questions

Years tested

3 · 2016–2024

In context

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Asked in

2024 2021 2016

What you need to know first

Chemical reactions basicsReactants and productsChemical reactionsCollision theoryFactors affecting reaction rateBasic chemistry termsConcentration and temperature definitionConcentration and temperature concepts

What mastering this unlocks

Photochemical reactions Activation energy

Real questions that test this

रासायनिक अभिक्रियेचा वेग हा साधारणपणे _____ Chemical reaction rates generally _____

1)वेळेनुसार संपूर्णपणे स्थिर राहतो / are constant throughout a reaction

2)सुरुवातीला कमी असतो आणि वेळेसह वाढत जातो / are slow at the beginning and increase with time

3)सुरुवातीला जास्त असतो आणि वेळेसह कमी होत जातो / are greater at the beginning of a reaction and decrease with time✓ Correct

4)असे सर्वसाधारण विधान केले जाऊ शकत नाही / no such generalization can be made

The rate of a chemical reaction is highest at the beginning because reactant concentrations are at their maximum, and it decreases over time as reactants are consumed.

जस जशी रासायनिक अभिक्रिया होत रहाते वेळेनुसार तिचा वेग _________ With the progress of any chemical reaction, the rate of the chemical reaction _________ with time.

1)decreases✓ Correct

2)increases

3)remains constant

4)increases very fast

The rate of a chemical reaction generally decreases with time as the concentration of reactants decreases and gets converted into products.

खालील विधाने विचारत घ्या. रासायनिक अभिक्रियेचा दर हा ______ वरीलपैकी कोणते विधान/विधाने बरोबर आहेत ? / Consider the following statements : Rate of a chemical reaction is _______ Which of the statement given above is/are correct ?

(a)अभिक्रियाकारकांच्या संहतीच्या प्रमाणात बदलतो. / proportional to the concentration of reactants.

(b)अभिक्रियाकारकांची संहती वाढविली की, कमी होतो. / decreases on increasing the concentration of reactants.

(c)तापमान वाढविले की, वाढतो. / increases on increasing the temperature.

(d)तापमान वाढविले की, कमी होतो. / decreases on increasing the temperature.

1)फक्त (b) / Only (b)

2)फक्त (d) / Only (d)

3)फक्त (a) आणि (c) / Only (a) and (c)✓ Correct

4)फक्त (b) आणि (d) / Only (b) and (d)

The rate of a chemical reaction is directly proportional to the concentration of reactants (higher concentration means more collisions) and increases with an increase in temperature (higher kinetic energy).

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