MCQ
The petrol having octane number $80$ has
- ✓$20\%$ normal heptane + $80\%$ iso-octane
- B$80\%$ normal heptane + $20\%$ iso-octane
- C$20\%$ normal heptane + $80\%$ normal octane
- D$80\%$ normal heptane + $20\%$ normal octane
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${\Delta _H}\, = \, - 57.2\,kJ\,mo{l^{ - 1}}$ and ${K_C} = 1.7\, \times \,{10^{16}}$
Which of the following statement is $INCORRECT$ ?
Assertion $A$: In the photoelectric effect, the electrons are ejected from the metal surface as soon as the beam of light of frequency greater than threshold frequency strikes the surface.
Reason $R$ : When the photon of any energy strikes an electron in the atom, transfer of energy from the photon to the electron takes place.
In the light of the above statements, choose the most appropriate answer from the options given below :
Statement $(I)$ : The oxidation state of an element in a particular compound is the charge acquired by its atom on the basis of electron gain enthalpy consideration from other atoms in the molecule.
Statement $(II)$ : $\mathrm{p} \pi-\mathrm{p} \pi$ bond formation is more prevalent in second period elements over other periods.
In the light of the above statements, choose the most appropriate answer from the options given below :
${ }^{-} \mathrm{OH}, \mathrm{R} \overline{\mathrm{O}}, \mathrm{CH}_3 \mathrm{CO} \overline{\mathrm{O}}, \mathrm{C} \overline{1}$
$N_{2}=3.0 \times 10^{-3} M$
$O_{2}=4.2 \times 10^{-3} M$
and $N O=2.8 \times 10^{-3} M$
in a sealed vessel at $800 \,K$ and $1$ $atm$ pressure.........$atm$ will be $K_{p}$ for the given reaction?
$N_{2}(g)+O_{2}(g) \rightleftharpoons 2 N O(g)$