MCQ
A solution of sodium acetate in water will
- ✓Turn red litmus blue
- BTurn blue litmus red
- CNot effect litmus
- DDecolourises litmus
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$(I)$ both the complexes can be high spin
$(II)$ $Ni(II)$ complex can very rarely be low spin.
$(III)$ with strong field ligands, $Mn(II)$ complexes can be low spin.
$(IV)$ aqueous solution of $Mn ( II )$ ions is yellow in color.
(At. nos. $Cr = 24, \,Mn = 25,\, Fe = 26, \,Co = 27$)
${H_2}O\left( g \right) + C\left( s \right) \to CO\left( g \right) + {H_2}\left( g \right);\Delta H = 131\,kJ$
$CO\left( g \right) + \frac{1}{2}{O_2}\left( s \right) \to C{O_2}\left( g \right);\Delta H = - 282\,kJ$
${H_2}\left( g \right) + \frac{1}{2}{O_2}\left( s \right) \to {H_2}O\left( g \right);\Delta H = - 242\,kJ$
$C(s) + O_2(g) \to CO_2(g); \Delta H = X\,kJ$
The value of $X$ will be......$kJ$