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Iron carbonyl, $Fe(CO)_5$ is

Trinuclear
Mononuclear
Tetranuclear
Dinuclear
Explanation:

Based on the number of metal atoms present in a complex, they are classified into mononuclear, dinuclear, trinuclear and so on.
eg: $Fe(CO)_5$ : mononuclear
$Co_2(CO)_8$ : dinuclear
$Fe_3(CO)_{12}$ : trinuclear
Hence, option (2) should be the right answer.
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Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations :
a. $60 mL\dfrac{M}{10}HCL+40 mL\dfrac{M}{10} NaOH$
b. $55 mL\dfrac{M}{10}HCL+45 mL\dfrac{M}{10} NaOH$
c. $75 mL\dfrac{M}{5}HCL+25 mL\dfrac{M}{5} NaOH$
d. $100 mL\dfrac{M}{10}HCL+100 mL\dfrac{M}{10} NaOH$
pH of which one of them will be equal to 1?

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(Given molar mass of $BaSO_4 = 233 g mol–1)$

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