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Gadolinium has a low value of third ionisation enthalpy because of:
The most acidic compound among the following is:
The d-electron configurations of Cr²⁺, Mn²⁺, Fe²⁺ and Ni²⁺ are 3d⁴, 3d⁵, 3d⁶ and 3d⁸ respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour? (At. No. Cr = 24, Mn = 25, Fe = 26, Ni = 28)
The electronic configurations of $\text{Eu}$ (Atomic no. $63$), $\text{Gd}$ (Atomic no. $64$), and $\text{Tb}$ (Atomic no. $65$) are, respectively:
Match List-I with List-II: **List-I (Element)** (A) Fe (B) V (C) Mn (D) Ti **List-II (Most Common oxidation state/s)** (I) +2, +7 (II) +3, +2 (III) +4 (IV) +5 Choose the correct answer from the options given below:
Iodoform reaction is given by: (a) $CH_3CH_2OH$ (b) $CH_3COCH_3$ (c) [Compound Missing] (d) $CH_3OH$
A pair among the following that have the same size is:
When copper is heated with conc. $\text{HNO}_3$ it produces:
Compound 'A' in acidic medium does not give a precipitate with $H_2S$ but in $NH_4OH$ medium gives a precipitate. Compound 'A' is:
The IUPAC name of the product that formed in the following chemical reaction is: Acetone $\xrightarrow{\text{(i) } C_2H_5MgBr, \text{ dry Ether}}$ $\xrightarrow{\text{(ii) } H_2O, H^+}$ Product
The basic character of the transition metal monoxides follows the order: (Atomic nos. Ti = 22, V = 23, Cr = 24, Fe = 26)
Match the reagents (List-I) with the products (List-II) obtained from phenol and select the correct option. **List-I (Reagents)** (A) (i) NaOH, (ii) CO₂, (iii) H⁺ (B) (i) Aqueous NaOH + CHCl₃, (ii) H⁺ (C) Zn dust, Δ (D) Na₂Cr₂O₇, H₂SO₄ **List-II (Products)** (I) Benzoquinone (II) Benzene (III) Salicylaldehyde (IV) Salicylic acid
A yellow precipitate with iodine and alkali is given by:
Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by the elimination of water. The reagent is:
Which of the following elements can combine with chlorine to form more than one binary compound?
The pair of electrons in the given carbanion, $\text{CH}_3\text{C}\equiv\text{C}^-$, is present in which of the following orbitals?
The number of carbon atoms per unit cell of diamond unit cell is:
Which of the following pairs of ions are isoelectronic and isostructural?
Which orbital does the additional electron occupy when $O_{2}$ is converted to the $O_{2}^{-}$ ion?
Identify the incorrect statement among the following: