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$Q.2 Fill in the blanks with suitable words.(i) The rate of an endothermic reaction with the increase in temperature.(ii) All radioactive disintegration nuclear reactions are of order(iii) For a fast reaction the rate constant is relatively and half - life is(iv) The second order reaction becomes if one of the reactants is in large excess.(v) Arrhenius equation can be used to find out of a reaction.$

Q5. The rate of a chemical reaction with respect to products is written with positive sign but with respect to reactants is written with a negative sign. Explain it with reference to the following hypothetical reaction.$\mathrm{aA}+\mathrm{bB} \rightarrow \mathrm{cC}+\mathrm{dD}$

$Q21. Some reactions taking place around room temperature have activation energies around 50 \mathrm{~kJ} \mathrm{mol}^{-1} .(i) What is the value of the factor e^{\frac{-\mathrm{E}}{\mathrm{RT}}} at 25^{\circ} \mathrm{C} ?$

$Q7. Differentiate between(i) Rate and rate constant of a reaction$

$Q.1 Multiple choice questions.(ii) If the rate equation of a reaction 2 \mathrm{~A}+\mathrm{B} \rightarrow products is rate =k[\mathrm{~A}]^{2}[\mathrm{~B}] and \mathrm{A} is present in large excess then order of reaction isa) 1(b) 2(c) 3(d) none of these$

$Q.1 Multiple choice questions.(iii) The rate of reactiona) increases as the reaction proceeds.b) decreases as the reaction proceeds.c) remains the same as the reaction proceeds.d) may decrease or increase as the reaction proceeds.$