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Among the following compounds, the strongest acid is:
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Which of the following conditions favours the existence of a substance in the solid state?
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Among the following, which one is a wrong statement.
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The correct order of oxidising power is:
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Acidity of diprotic acid in aqueous solution increases in order.
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Covalency of nitrogen is restricted to ______.
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Lower molecular mass alcohols are ______.
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How much ethyl alcohol must be added to 1 litre of water so that the solution will freeze at -14°C? (Kf for water = 1.86°C/mol)
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Which of the following has highest ionisation enthalpy?
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Which of the following statements is true?
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Which of the following analogies is correct?
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Match the items given in Column I with the items given in Column II.
| Column I | Column II |
| (i) Mg in solid state | (a) p-Type semiconductor |
| (ii) MgCl2 in molten state | (b) n-Type semiconductor |
| (iii) Silicon with phosphorus | (c) Electrolytic conductors |
| (iv) Germanium with boron | (d) Electronic conductors |
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Consider a first order gas phase decomposition reaction given below :
\[\ce{A(g) -> B(g) + C(g)}\]
The initial pressure of the system before decomposition of A was pi. After lapse of time ‘t’, total pressure of the system increased by x units and became ‘pt’ The rate constant k for the reaction is given as ______.
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Which of the following statements is not correct about order of a reaction.
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Rate law for the reaction \[\ce{A + 2B -> C}\] is found to be Rate = k [A][B]. Concentration of reactant ‘B’ is doubled, keeping the concentration of ‘A’ constant, the value of rate constant will be ______.
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Compounds ‘A’ and ‘B’ react according to the following chemical equation.
\[\ce{A(g) + 2B(g) -> 2C(g)}\]
Concentration of either ‘A’ or ‘B’ were changed keeping the concentrations of one of the reactants constant and rates were measured as a function of initial concentration. Following results were obtained. Choose the correct option for the rate equations for this reaction.
| Experiment | Initial concentration of [A]/mol L–¹ |
Initial concentration of [B]/mol L–¹ |
Initial rate of formation of [C]/mol L–¹ s–¹ |
| 1. | 0.30 | 0.30 | 0.10 |
| 2. | 0.30 | 0.60 | 0.40 |
| 3. | 0.60 | 0.30 | 0.20 |
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The value of rate constant of a pseudo first order reaction ______.
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Consider the reaction A ⇌ B. The concentration of both the reactants and the products varies exponentially with time. Which of the following figures correctly describes the change in concentration of reactants and products with time?
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In any unimolecular reaction:
(i) only one reacting species is involved in the rate determining step.
(ii) the order and the molecularity of slowest step are equal to one.
(iii) the molecularity of the reaction is one and order is zero.
(iv) both molecularity and order of the reaction are one.
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For a complex reaction:
(i) order of overall reaction is same as molecularity of the slowest step.
(ii) order of overall reaction is less than the molecularity of the slowest step.
(iii) order of overall reaction is greater than molecularity of the slowest step.
(iv) molecularity of the slowest step is never zero or non interger.
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