# HSC Chemistry - Important One Mark Questions

Question Set 5, New one mark Questions for Chemistry subject. Share your answers to these questions, by posting them in the comments section.
1) In the Bragg’s equation for diffraction of X-rays, ‘n’ represents:

a) The number of moles
c) A quantum number
d) Order of reflection

2) An example of metal deficiency defect:

a) CsCl
b) KCl
c) NaCl
d) FeS

3) If $\Delta$ for a reaction is negative, the change is:

a) Non-spontaneous
b) Spontaneous
c) Reversible
d) Irreversible

4) Which of the following process is always non-feasible?

a) $\Delta H>0, \Delta S>0$
b) $\Delta H<0, \Delta S>0$
c) $\Delta H>0, \Delta S<0$
d) $\Delta H<0, \Delta S<0$

5) If the equilibrium constants of the reactions are $2A\rightleftharpoons B$ is $k_{1}$ and $B\rightleftharpoons 2A$ is $k_{2}$

a) $k_{1}=2k_{2}$
b) $k_{1}=\frac{1}{k_{2}}$
c) $(k_{1})^2=k_{2}$
d) $k_{1}=\frac{1}{(k_{2})^2}$

6) The equilibrium constant $K_{c}$ for the reaction $2O_{3}\rightleftharpoons 3O_{2}$ is

a) $\frac{[O_{3}]^2}{[O_{2}]^3}$
b) $\frac{[O_{2}]^3}{[O_{3}]^2}$
c) $\frac{[O_{3}]^3}{[O_{2}]^2}$
d) $\frac{[O_{2}]^2}{[O_{3}]^3}$

7) The unit of rate constant is:

a) $litre \; mol^{-1}\;sec^{-1}$
b) $litre^{-1} \; mol\;sec^{-1}$
c) $sec^{-1}$
d) $litre^{2} \; sec^{-1}$

8) The half life period of a first order reaction is 10 minutes. Then the rate constant is:

a) $6.93\times10^{2} \;min^{-1}$
b) $0.693\times10^{-2} \;min^{-1}$
c) $6.932\times10^{-2} \;min^{-1}$
d) $69.3\times10^{-1} \;min^{-1}$

9) The relation between $K_{p}$ and $K_{c}$ in the equilibrium $2SO_{2(g)}+O_{2(g)}\rightleftharpoons 2SO_{3(g)}$

a) $K_{p}=K_{c}\;RT$
b) $K_{p}=K_{c}\;(RT)^{2}$
c) $K_{p}\;RT=K_{c}$
d) $K_{p}=K_{c}\;(RT)^{-2}$

10) When ether is exposed to air for some time an explosive substance produced is:

a) peroxide
b) oxide
c) TNT
d) super oxide