A red precipitate is obtained when an ethanol solution of dimethylglyoxime is added to ammoniacal Ni(II).
Which of the following statements is not true?
1. Complex has symmetrical H-bonding.
2. Red complex has a tetrahedral geometry.
3. Dimethylglyoxime functions as a bidentate ligand.
4. Red complex has a square planar geometry.
Which orbital does the additional electron occupy when O₂ is converted to the O₂⁻ ion?
| 1. | 2. | ||
| 3. | 4. |
Consider the reaction:
What sort of reaction is it?
1. Free radical addition – elimination reaction
2. Electrophilic substitution-elimination reaction
3. Nucleophilic addition – elimination reaction
4. Electrophilic addition – elimination reaction
The given sequence among the following arrangements that is not strictly according to the property indicated against it.
| 1. | H2O < H2S < H2Se < H2Te : \(\small{\text{increasing} \ p K_{a}\ \text{values}}\) |
| 2. | \(\small{\mathrm{N H_{3} < P H_{3} < A s H_{3} < S b H_{3}} : \text{increasing acidic character}}\) |
| 3. | \(\small{\mathrm{C O_{} < S i O_{} < S n O_{} < P b O_{2}} : \text{increasing oxidising power}} \) |
| 4. | \(\small{\mathrm{H F < H C l < H B r < H I} : \text{increasing acidic strength}} \) |
The Gibb's energy for the decomposition of \(\mathrm{A l_{2} O_{3}}\) at \(\mathrm{500~ ^\circ C}\) is as follows:
2/3Al2O3 → 4/3Al + O2 ; ∆rG = + 960 k J mol–1
The potential difference needed for the electrolytic reduction of aluminium oxide (Al2O3) at \(\mathrm{500~ ^\circ C}\) is at least,
1. 3.0 V
2. 2.5 V
3. 5.0 V
4. 4.5 V
Find the equilibrium constant for the reaction:
SO₃(g) ⇌ SO₂(g) + ½O₂(g)
Given:
2SO₂(g) + O₂(g) ⇌ 2SO₃(g), K = 278
1. 3.6 × 10⁻³2. 6.0 × 10⁻²
3. 1.3 × 10⁻⁵
4. 1.8 × 10⁻³
The compound that is used as antifreeze in automobile radiators is:
| 1. | Glycol | 2. | Nitrophenol |
| 3. | Ethyl alcohol | 4. | Methyl alcohol |
Molar conductivities at infinite dilution of
NaCl, HCl, and are 126.4, 425.9, and 91.0 S cm2 mol–1 respectively.
for will be:
| 1. | \(180.5~S~cm^2~mol^{-1}\) | 2. | \(290.8~S~cm^2~mol^{-1}\) |
| 3. | \(390.5~S~cm^2~mol^{-1}\) | 4. | \(425.5~S~cm^2~mol^{-1}\) |
Calculate the vapour pressure of a solution prepared by mixing 25.5 g of chloroform (CHCl₃) and 40 g of dichloromethane (CH₂Cl₂) at 25°C.
Given:
Vapour pressure of pure CHCl₃ = 200 mmHg
Vapour pressure of pure CH₂Cl₂ = 415 mmHg
Molar mass of CHCl₃ = 119.5 g mol⁻¹
Molar mass of CH₂Cl₂ = 85 g mol⁻¹
| 1. | 90.40 mm Hg | 2. | 119.5 mm Hg |
| 3. | 348 mm Hg | 4. | 173.9 mm Hg |
A certain gas takes three times as long to effuse out as helium. Its molecular mass will be:
1. 36 u
2. 64 u
3. 9 u
4. 27 u
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