ChemistryQ151–152 of 179 questions
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151
ChemistryMediumMCQAP EAMCET · 2012
The quantum number which explains the line spectra observed as doublets in the case of hydrogen and alkali metals,and doublets and triplets in the case of alkaline earth metals is:
A
$Spin$
B
$Azimuthal$
C
$Magnetic$
D
$Principal$
Solution
(A) The $Spin$ quantum number $(s)$ explains the fine structure of spectral lines,such as the doublets observed in the spectra of $H$ and alkali metals,and the doublets and triplets observed in the spectra of alkaline earth metals,due to the electron spin angular momentum.
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152
ChemistryEasyMCQAP EAMCET · 2012
Molar heat capacity $(C_p)$ of water at constant pressure is $75 \ J \ K^{-1} \ mol^{-1}$. The increase in temperature (in $K$) of $100 \ g$ of water when $1 \ kJ$ of heat is supplied to it is
A
$2.4$
B
$0.24$
C
$1.3$
D
$0.13$
Solution
(A) The formula for heat supplied at constant pressure is $\Delta H = n C_p \Delta T$.
Given:
Heat supplied $(q)$ = $1 \ kJ = 1000 \ J$.
Mass of water $(m)$ = $100 \ g$.
Molar mass of water $(M_{H_2O})$ = $18 \ g \ mol^{-1}$.
Number of moles $(n)$ = $\frac{m}{M} = \frac{100}{18} \ mol$.
$C_p = 75 \ J \ K^{-1} \ mol^{-1}$.
Substituting the values:
$1000 = (\frac{100}{18}) \times 75 \times \Delta T$.
$\Delta T = \frac{1000 \times 18}{100 \times 75} = \frac{180}{75} = 2.4 \ K$.
Given:
Heat supplied $(q)$ = $1 \ kJ = 1000 \ J$.
Mass of water $(m)$ = $100 \ g$.
Molar mass of water $(M_{H_2O})$ = $18 \ g \ mol^{-1}$.
Number of moles $(n)$ = $\frac{m}{M} = \frac{100}{18} \ mol$.
$C_p = 75 \ J \ K^{-1} \ mol^{-1}$.
Substituting the values:
$1000 = (\frac{100}{18}) \times 75 \times \Delta T$.
$\Delta T = \frac{1000 \times 18}{100 \times 75} = \frac{180}{75} = 2.4 \ K$.
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