HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Important Questions for Chemistry

Explain pseudo first order reaction with a suitable example.

Explain with the help of a potential energy diagram that the catalyst increases the rate of the reaction.

For the reaction 2A + B → C, rate of disappearance of A 0.076 mol s ^–1.

1. What is the rate of formation of C?
2. What is the rate of consumption of B?
3. What is the rate of the overall reaction?

In a first-order reaction A → B, 60% of a given sample of a compound decomposes in 45 mins. What is the half-life of reaction? Also, write the rate law equation for the above first-order reaction.

Derive integrated rate law for a zero-order reaction \[\ce{A -> Product}\].

Obtain the expression for half-life and rate constant of the first-order reaction.

Define the half-life of a first-order reaction.

Which of the following correctly represents integrated rate law equation for a first order reaction in a gas phase?

What is the rate constant?

What is zero order reaction?

If unit of rate constant is mol dm⁻³s⁻¹, the order of reaction would be ______.

For the reaction A + B → P.

If [B] is doubled at constant [A], the rate of reaction doubled. If [A] is triple and [B] is doubled, the rate of reaction increases by a factor of 6. Calculate the rate law equation.

The half-life period for the first order reaction is 1.7 hrs. How long will it take for 20% of the reactant to disappear?

Describe anomalous behaviour of oxygen as compared with other elements of group 16 with reference to -
(a) Magnetic property                                        
(b) Oxidation state
(c) Hydrides

Describe anomalous behaviour of fluorine with the other elements of group 17 wilh reference to :

(a) Hydrogen bonding

(b) Oxidation state

(c) Polyhalide ions

Arrange the following oxyacids of chlorine - HClO, HClO₂, HClO₃, and HClO₄ with respect to increasing order of thermal stability.

What happens when thin copper leaves are thrown in jar containing chlorine?

What is the action of chlorine (Cl) on the following:

Cold and dilute caustic soda

What is the action of chlorine (Cl) on the following:

Hot and concentrated caustic soda

What is the action of chlorine (Cl) on the following:

Potassium bromide solution