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The formation of the oxide ion O²⁻(g) from oxygen atom requires first an exothermic and then an endothermic step as shown below: O(g) + e⁻ → O⁻(g); ΔH° = -141 kJ mol⁻¹ O⁻(g) + e⁻ → O²⁻(g); ΔH° = +780 kJ mol⁻¹ Thus, the process of formation of O²⁻ in gas phase is unfavourable even though O²⁻ is isoelectronic with neon. It is due to the fact that:
The correct order of the decreasing ionic radii among the following isoelectronic species is:
Identify the wrong statement in the following:
Which one of the following arrangements does not give the correct picture of the trends indicated against it?
Which of the following pair is correctly matched?
Identify the incorrect match regarding the IUPAC Official Name of the element:
In the preparation of alkene from alcohol using Al₂O₃, which is an effective factor?
The element expected to form the largest ion to achieve the nearest noble gas configuration is:
Which of the following arrangements is correct for increasing order of electronegativity?
In the given nuclear reaction, the element $X$ is $^{22}_{11}\text{Na} \rightarrow X + e^+$
Match Column-I with Column-II and select the correct option: **Column-I** (a) Copper (b) Fluorine (c) Silicon (d) Cerium **Column-II** (i) Non-metal (ii) Transition metal (iii) Lanthanoid (iv) Metalloid
The compound that gives p-cresol with p-methyl diazonium chloride is:
Which one of the following statements is true about the structure of $CO_3^{2-}$ ion?
Among the following four compounds: (a) Phenol (b) Methyl phenol (c) meta-nitrophenol (d) para-nitrophenol The acidity order is:
The product formed in the following chemical reaction is: [Reaction Scheme Missing]
The compound that will not form a yellow precipitate on heating with an alkaline solution of iodine is:
The structure of intermediate A in the following reaction is: $$\text{Cumene} \xrightarrow{O_2} A \xrightarrow{H_3O^+} \text{Phenol} + \text{Acetone}$$
The correct acidic order of the following is: (I) [Structure Missing] (II) [Structure Missing] (III) [Structure Missing]
Which one is the most acidic compound?
Ethylene diaminetetraacetate (EDTA) ion is :