List of practice Questions

The effect of temperature on reaction rate is shown by

$N _{2}(g)+3 H _{2}(g) \rightleftharpoons 2 NH _{3}(g)+22\, kcal$. The activation energy for the forward reaction is $50\, kcal$. What is the activation energy for the backward reaction?

Acid hydrolysis of sucrose is a

In the respect of the equation $ k=A{{e}^{-{{E}_{a}}/RT}} $ in chemical kinetics, which one of the following statements is correct?

For a first order reaction, to obtain a positive slope, we need to plot {where $[A]$ is the concentration of reactant $A$}

The following mechanism has been proposed for the reaction of NO with $Br_{2}$to form NOBr : $NO\left(g\right)+Br_{2} \left(g\right) \text{rightleftharpoons} NOBr_{2} \left(g\right)$ $NOBr \left(g\right)+NO \left(g\right) \to 2NOBr \left(g\right)$ If the second step is the rate determining step, the order of the reaction with respect to NO (g) is:

The radioactivity of a sample is $ {{R}_{1}} $ at a time $ {{T}_{1}} $ and $ {{R}_{2}} $ at times $ {{T}_{2}} $ . the half-life of the specimen is $T$, the number of atoms that have disintegrated at the time $ ({{T}_{2}}-{{T}_{1}}) $ is proportional to

Which one of the following is a saprophytic bryophyte?

Bryophytes have probably evolved from

In which book, Bentham and Hooker proposed their classification?

The primary protenema of moss by death and decay of cells may break into fragments. Each fragment gives rise to leafy gametophyte.

Which of the following is not feature of gymnosperms ?

Ectophloic siphonostele is found in

The phenomenon of sulphur shower in pine forest is due to

Which of the following is/are grouped under phanerogams ?

An unknown element forms an oxide. What will be the equivalent weight of the element if the oxygen content is $20\%$ by weight?

$1$ mole of methyl amine on reaction with nitrous acid gives at $NTP$

1.520 g of hydroxide of a metal on ignition gave 0.995 g of its oxide. The equivalent weight of the metal is

During electrolysis of water the volume of $O _{2}$ liberated is $2.24\, dm ^{3}$. The volume of hydrogen liberated, under same conditions will be

Mass of acetic acid required to neutralize 100 cc of 0.1 N NaOH solution is

The number of moles of oxygen obtained by the electrolytic decomposition of $108 \,g$ water is

Number of atoms of $He$ in $100\, u$ of $He$ (atomic wt of $He$ is $4$) are

If charge and distance between two charges are reduced to half. Force between them

If the electric flux entering and leaving an enclosed surface respectively are $\phi_{1}$ and $\phi_{2}$, the electric charge inside the surface will be

Three point charges $ +q,-2q $ and $ +q $ are placed at points $ (x=0,y=a,x=0), $ $ (x=0,y=0,z=0) $ and $ (x=a,y=0,z=0), $ respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are