Your answers are shown below:
1. For a reaction A + 2B→C, rate is given by
r = K[A][B]2
The order of reaction is :
7
6
3correct
5
Question was not answered
2. In the reaction 2 A + B → A2 B, if the concentration of A is doubled and that of B is halved, then the rate of reaction will
Increase 2 timescorrect
Decrease 2 times
Increase 4 times
Remain the same
Question was not answered
3. The half-life of a first order reaction having rate constant K = 1.7 × 10–5s–1 is
9.7 h
12.1 h
1.8 h
11.3 hcorrect
Question was not answered
4. The order of a reaction is said to be 2 with respect to a reactant X, when
The reaction occurs in two steps
The rate of the reaction is proportional to [X]
The rate of the reaction is proportional [X]2correct
Two molecules of X are present in the stoichiometric equation
Question was not answered
5. A first order reaction is half completed in 45 minutes. How long does it need 99.9% of the reaction to be completed
7.5 hourscorrect
10 hours
5 hours
20 hours
Question was not answered
6. If the temperature is increased by 10ºC the rate of the reaction becomes
Ten times less
Two times less
Ten times more
Two times morecorrect
Question was not answered
7. Half life period of second order reaction is
Proportional to the initial concentration of reactants
Inversely proportional to square of initial concentration of reactants
Inversely proportional to initial concentration of reactantscorrect
Independent of the initial concentration of reactants
Question was not answered
8. Select the incorrect statement.
Reaction is a result of collision between the molecules
Rate of reaction for a bimolecular elementary reaction is rate = \displaystyle {{Z}_{{AB}}}{{e}^{{-{{E}_{a}}/RT}}}$
Collision theory is based on kinetic theory of gases
Collision frequency is the number of collision per second per unit lengthcorrect
Question was not answered
9. In a reaction, 2x→y, the concentration of x decreases from 3.0 M to 1.5 M in 4 min. The rate of the reaction is
3.75 × 10–1M min–1
0.187 M min–1correct
1.87 M min–1
0.75 M min–1
Question was not answered
10. During a chemical reaction with increase in time, rate of a reaction
decreasescorrect
show irregular trends
remains constant
increases
Question was not answered
11. Rate constant depends on
Initial concentration
Time
None of these
Temperaturecorrect
Question was not answered
12. Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen ?
NO, HNO3, NH4Cl, N2
HNO3, NH4Cl, NO, N2
HNO3, NO, NH4Cl, N2
HNO3, NO, N2, NH4Clcorrect
Question was not answered
13. When a reaction is progressing
The rate of the reaction goes on increasing
The concentration of the products goes on decreasing
The concentration of the reactants goes on decreasingcorrect
The reaction rate always remains constant
Question was not answered
14. Inversion of sucrose is
Zero order reaction
Second order reaction
Third order reaction
First order reaction correct
Question was not answered
15. A first order reaction has a half-life period of 96.3 sec. At 0.10 mol litre–1 reactant concentration, rate will be :
10–4 M sec–1
10–1 M sec–1
6.93 × 10–1 M sec–1
10–3 M sec–1correct
Question was not answered
© 2002 - 2019 Chemistry Classes, Gurugram, INDIA Terms & Conditions | Privacy Policy
Answers
Explanation:
your answers are shown below:
1. for a reaction a + 2b→c, rate is given by
r = k[a][b]2
the order of reaction is :
7
6
3correct
5
question was not answered
2. in the reaction 2 a + b → a2 b, if the concentration of a is doubled and that of b is halved, then the rate of reaction will
increase 2 timescorrect
decrease 2 times
increase 4 times
remain the same
question was not answered
3. the half-life of a first order reaction having rate constant k = 1.7 × 10–5s–1 is
9.7 h
12.1 h
1.8 h
11.3 hcorrect
question was not answered
4. the order of a reaction is said to be 2 with respect to a reactant x, when
the reaction occurs in two steps
the rate of the reaction is proportional to [x]
the rate of the reaction is proportional [x]2correct
two molecules of x are present in the stoichiometric equation
question was not answered
5. a first order reaction is half completed in 45 minutes. how long does it need 99.9% of the reaction to be completed
7.5 hourscorrect
10 hours
5 hours
20 hours
question was not answered
6. if the temperature is increased by 10ºc the rate of the reaction becomes
ten times less
two times less
ten times more
two times morecorrect
question was not answered
7. half life period of second order reaction is
proportional to the initial concentration of reactants
inversely proportional to square of initial concentration of reactants
inversely proportional to initial concentration of reactantscorrect
independent of the initial concentration of reactants
question was not answered
8. select the incorrect statement.
reaction is a result of collision between the molecules
rate of reaction for a bimolecular elementary reaction is rate = \displaystyle {{z}_{{ab}}}{{e}^{{-{{e}_{a}}/rt}}}$
collision theory is based on kinetic theory of gases
collision frequency is the number of collision per second per unit lengthcorrect
question was not answered
9. in a reaction, 2x→y, the concentration of x. decreases from 3.0 m to 1.5 m in 4 min. the rate of the reaction is
3.75 × 10–1m min–1
0.187 m min–1correct
1.87 m min–1
0.75 m min–1
question was not answered
10. during a chemical reaction with increase in time, rate of a reaction
decreasescorrect
show irregular trends
remains constant
increases
question was not answered
11. rate constant depends on
initial concentration
time
none of these
temperaturecorrect
question was not answered
12. which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen .
no, hno3, nh4cl, n2
hno3, nh4cl, no, n2
hno3, no, nh4cl, n2
hno3, no, n2, nh4clcorrect
question was not answered
13. when a reaction is progressing
the rate of the reaction goes on increasing
the concentration of the products goes on decreasing
the concentration of the reactants goes on decreasingcorrect
the reaction rate always remains constant
question was not answered
14. inversion of sucrose is
zero order reaction
second order reaction
third order reaction
first order reaction correct
question was not answered
15. a first order reaction has a half-life period of 96.3 sec. at 0.10 mol litre–1 reactant. concentration, rate will be :
10–4 m sec–1
10–1 m sec–1
6.93 × 10–1 m sec–1
10–3 m sec–1correct
question was not answered
© 2002 - 2019 chemistry classes, gurugram, india terms & conditions | privacy policy!