Only Fe3+ ions give blood red colouration with SCN−ions. Fe3++SCN−⟶[Fe(SCN)]2+ (dark red)
Which of the following statements is incorrect?
Held on 22 Apr 2013 · Verified 6 Jul 2026.
Fe2+ ion also gives blood red colour with SCN−ion.
Fe3+ ion also gives blood red colour with SCN−ion.
On passing H2 S into Na2ZnO2 solution a white ppt of ZnS is formed.
Cupric ion reacts with excess of ammonia solution to give deep blue colour of [Cu(NH3)4]2+ ion.
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First and second ionization enthalpies of lithium are $520$ kJ mol$^{-1}$ and $7297$ kJ mol$^{-1}$ respectively. Energy required to convert $3.5$ mg lithium (g) into $\text{Li}^{2+}$(g) $[\text{Li(g)} \rightarrow \text{Li}^{2+}\text{(g)}]$ is _______ kJ mol$^{-1}$. (nearest integer) [Molar mass of Li $= 7$ g mol$^{-1}$]
Regarding the hydrides of group 15 elements $\mathrm{EH}_{3}(\mathrm{E}=\mathrm{N}, \mathrm{P}, \mathrm{As}, \mathrm{Sb})$, select the correct statement from the following: A. The stability of hydrides decreases down the group. B. The basicity of hydrides decreases down the group. C. The reducing character increases down the group. D. The boiling point increases down the group. Choose the correct answer from the options given below:
Which of the following elements has the highest electronegativity?
Which of the following elements has the highest electronegativity?
In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right element, except noble gases, are respectively.
Work through every JEE Main Inorganic Chemistry PYQ, year by year.