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Quiz 194
Mdcat-past-papers Quiz
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3861. The thermal decomposition of nitrogen pentaoxide follows which one of the following order of reaction?
First order
Second order
Fractional order
Third order
3862. One mole of a reactant reacts with a rate of 0.6 mol dm⁻³ s⁻¹. What is the rate constant of this reaction if reaction is first order?
0.6 s⁻¹
1 s⁻¹
0.3 s⁻¹
0.9 s⁻¹
3863. The unit of rate constant k is dm³ mol⁻¹ s⁻¹ for a chemical reaction. The order of reaction is:
Zero order
First order
Second order
Third order
3864. In a rate equation, rate = k[A][B], the reaction is:
Zero order
First order
Second order
Third order
3865. Forward reaction is the one that:
Is very slow at the beginning of the reaction
Reacts to form reactants
Speeds up gradually and at equilibrium its rate becomes constant
Takes place from left to right as given in chemical equation
3866. For a first order reaction A → B, the rate constant is 0.0458 s⁻¹. Calculate rate of reaction if the concentration of reactant is 0.35 mol dm⁻³.
0.012 mol dm⁻³ s⁻¹
0.016 mol dm⁻³ s⁻¹
0.014 mol dm⁻³ s⁻¹
0.018 mol dm⁻³ s⁻¹
3867. A reaction is first order with respect to A and second order with respect to B. The rate equation is:
Rate = k[A]
Rate = k[A][B]²
Rate = k[A]²[B]
Rate = k[A][B]
3868. When the concentration of A(g) doubles, the rate of reaction increases four folds. This means it is a:
Negative order reaction
First order reaction
Zero order reaction
Second order reaction
3869. For which of the following orders of reaction, the rate of reaction is inversely proportional to the concentration?
1st order
2nd order
Negative order
Zero order reaction
3870. The sum of exponents in the rate equation gives:
Half life
Velocity constant
Order of reaction
Chemical equilibrium
3871. The rate of reaction:
Increases as the reaction proceeds
Remains the same as the reaction proceeds
Decreases as the reaction proceeds
May increase or decrease as the reaction proceeds
3872. Unit of rate constant is same as the rate equation for:
1st order
2nd order
3rd order
Zero order
3873. Rate of any reaction depends upon:
Temperature
Concentration
Pressure
Rate constant
3874. What is NOT True about rate of reaction?
Concentration of reactants does not affect rate of reaction
Surface area of reactants affects rate of reaction
Concentration affects rate of reaction
Catalyst affects rate of reaction
3875. 6CO₂ + 6H₂O ⟶ C₆H₁₂O₆ + 6O₂ (in presence of sunlight). Predict the order of reaction
1st order
2nd order
3rd order
Zero order
3876. Which of the following mechanisms is consistent with the rate law Rate = k[NO]²[H₂]?
2NO + H₂ → N₂ + H₂O₂ (slow); H₂O₂+ H2 → 2H₂O (fast)
NO + H₂O → H₂O₂ + NO (slow); H₂O₂ + H₂ → 2H₂O (fast)
2NO + H₂ → N₂O + H₂O (slow); N₂O + H₂ → N₂ + H₂O (fast)
NO + NO → N₂O₂ (slow); N₂O₂ → N₂ + O₂ (fast); O₂ + H₂ → H₂O (fast)
3877. If a reactant/product can absorb UV, visible or IR radiation, then the rate of reaction is best measured by:
Chemical method
Spectrometry
Graphical method
Differential method
3878. If rate constant k = 0.693 min⁻¹, what is the half-life for the 1st order reaction?
1 min
2 min
0.693 min
4 min
3879. Half-life of N₂O₅ at 0°C is 24 min. How long will it take for a sample to decay to 25% of its original concentration?
24 min
72 min
120 min
48 min
3880. Which order of reaction obeys the formula t₁⁄₂ = 1/ka?
Zero
1st
2nd
3rd
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