Rate of Reaction

Q.

Balance the following equation:

$\mathrm{Al}{\left(\mathrm{OH}\right)}_3\stackrel{∆}{\to }{\mathrm{Al}}_2{\mathrm{O}}_3+{\mathrm{H}}_2\mathrm{O}$

Q. Oxidation number of oxygen in hydrogen peroxide is .

1. -1
2. -2
3. 1

Q.

Balance the following equation:

• 2Pb(NO₃)₂ →2PbO + 4NO₂ + O₂

Q. The oxidation number of O is in ${\text{OF}}_2$ and in ${\text{H}}_2\text{O}$.

1. +2
2. -1
3. +1
4. 0
5. -2

Q. $xA+yB\to zC.If-\frac{d\left[A\right]}{dt}=-\frac{d\left[B\right]}{dt}=1.5\frac{d\left[C\right]}{dt}$ then x.y and z are

1. 1, 1, 1
2. 3, 2, 3
3. 3, 3, 2
4. 2, 2, 3

Q.

Does increasing pressure increase the rate of reaction?

Q. The data for the reaction is A + B $\to$C is
$\begin{array}{cccc}Exp.& [A{]}_0& [B{]}_0& Initialrate\\ 1& 0.012& 0.035& 0.10\\ 2& 0.024& 0.035& 0.80\\ 3& 0.012& 0.070& 0.10\\ 4& 0.024& 0.070& 0.80\end{array}$

1. $r=k[B{]}^3$
2. $r=k[A{]}^3$
3. $r=k\left[A\right][B{]}^4$
4. $r=k\left[A{]}^2\right[B{]}^2$

Q.

Complete and balance following equations $\mathrm{CO}+{\mathrm{H}}_2\to$

Q.

What is decomposition reaction? Explain with suitable reaction.

Q.

Write chemical equations in symbols and formulae for the following word equations.
$\mathrm{Silver}\mathrm{chloride}\to \mathrm{Silver}+\mathrm{Chlorine}$

Q. Which of the following metal oxide is referred as rust?

1. Iron oxide
2. Calcium oxide
3. Sodium oxide
4. Copper oxide

Q.

…………… was able to show the relationship between oxygen and metal, resulting in rust.

Q.

The symbol aq in a chemical equation represents __.

Q. A reaction follows the given concentration (M)-time graph. The rate for this reaction at 20 seconds will be

1. $4\times {10}^{-3}M/s$
2. $8\times {10}^{-2}M/s$
3. $2\times {10}^{-2}M/s$
4. $7\times {10}^{-3}M/s$

Q.

Balance the following equations.
$\mathrm{Ca}+{\mathrm{O}}_2\to \mathrm{CaO}$

Q. Nitrogen tetra oxide $\left(N_2{O}_4\right)$ decomposes as $N_2{O}_4\left(g\right)\to 2N{O}_2\left(g\right)$. If the pressure of $\left(N_2{O}_4\right)$ falls from 0.50 atm to 0.32 atm is 30 minutes, the rate of appearance of $N{O}_2\left(g\right)$ is

1. 0.012 atm/min
2. 0.006 atm/min
3. 0.003 atm/min
4. 0.024 atm/min

Q. The concentration of a reactant changes from .03M to .02M in 25 minutes. The average rate of reaction, using time in seconds is

1. $6.67\times {10}^{-6}mol/l/s$
2. $0.4\times {10}^{-3}mol/l/s$
3. $0.024mol/l/s$
4. $0.24mol/l/s$

Q.

What are variable valencies? State a few examples.

Q.

Balance the chemical equation:

$\mathrm{Na}+{\mathrm{H}}_2\mathrm{O}\to \mathrm{NaOH}$

Q. Sulphur pieces do not react with cold concentrated nitric acid. But sulphur powder reacts.
a) Explain the reason why the rate of chemical reaction is increased here?
b) Suppose you want to increase the rate of reaction again. Which way you would choose? Give reason.

Q.

A skeleton equation is

Q.

What is a balanced equation?

Q. Which of the following are the examples of a chemical reaction?

Q. Slide to the correct value of x to balance the given equation.

${\mathrm{Fe}}_2{O}_3\left(s\right)+3H_2\left(g\right)\to 2\mathrm{Fe}\left(s\right)+{\mathrm{xH}}_{2}O\left(l\right)$