Three thermochemical equations are given below:
Based on the above equations, find out which one of the relationships given below is correct :
| (i) | C(graphite) + O2(g) \(\rightarrow\) CO2(g); \(\Delta_{r}\)H° = x kJ mol–1 |
| (ii) | Cgraphite + 1/2 O2(g) \(\rightarrow\) CO(g); \(\Delta_{r}\)H° = y kJ mol–1 |
| (iii) | CO(g) + 1/2 O2(g) \(\rightarrow\) CO2(g); \(\Delta_{r}\)H° = z kJ mol–1 |
| 1. | z = x + y | 2. | x = y + z |
| 3. | y = 2z – x | 4. | x = y – z |
Subtopic: Hess's Law |
79%
Level 2: 60%+
NEET - 2013
Hints
What is the correct order of electron gain enthalpy from least negative to most negative for the elements C, Ca, Al, F, and O?
1. Al < Ca < O < C < F
2. Al < O < C < Ca < F
3. C < F < O < Al < Ca
4. Ca < Al < C < O < F
1. Al < Ca < O < C < F
2. Al < O < C < Ca < F
3. C < F < O < Al < Ca
4. Ca < Al < C < O < F
Subtopic: Electron Affinity (EA) |
82%
Level 1: 80%+
NEET - 2013
Hints
The anion of acetylacetone (acac) forms Co(acac)3 chelate with Co3+. The rings of the chelate are:
1. Five membered
2. Four membered
3. Six membered
4. Three membered
1. Five membered
2. Four membered
3. Six membered
4. Three membered
Subtopic: Ligands |
Level 3: 35%-60%
NEET - 2013
Hints
At 100 °C the Kw of water is 55 times its value at 25ºC. What will be the pH of a neutral solution?
(log 55 = 1.74)
(log 55 = 1.74)
| 1. | 7.00 | 2. | 7.87 |
| 3. | 5.13 | 4. | 6.13 |
Subtopic: pH calculation |
57%
Level 3: 35%-60%
NEET - 2013
Hints
Identify the incorrect statements, regarding the molecule XeO4:
1. XeO4 molecule is square planar
2. There are four p\(\pi\) – d\(\pi\) bonds
3. There are four sp3 – p, \(\sigma\) bonds
4. XeO4 molecule is tetrahedral
1. XeO4 molecule is square planar
2. There are four p\(\pi\) – d\(\pi\) bonds
3. There are four sp3 – p, \(\sigma\) bonds
4. XeO4 molecule is tetrahedral
Subtopic: V.S.E.P.R & V.B.T |
65%
Level 2: 60%+
NEET - 2013
Hints
In Castner-Kellner cell for the production of sodium hydroxide:
1. brine is electrolyzed using graphite electrodes
2. molten sodium chloride is electrolysed
3. sodium amalgam is formed at mercury cathode
4. brine is electrolyzed with Pt electrodes
1. brine is electrolyzed using graphite electrodes
2. molten sodium chloride is electrolysed
3. sodium amalgam is formed at mercury cathode
4. brine is electrolyzed with Pt electrodes
Subtopic: Compounds of Ca and Na -Preparations, Properties & Uses |
59%
Level 3: 35%-60%
NEET - 2013
Hints
Subtopic: Aromaticity & Polarity |
84%
Level 1: 80%+
NEET - 2013
Hints
Phenol is distilled with Zn dust followed by Fridel Crafts alkylation with propyl chloride in the presence of AlCl3 to give a compound (B). (B) is oxidized in the presence of air to form the compound (C). The structural formula of (C) is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Phenols: Preparation & Properties |
73%
Level 2: 60%+
NEET - 2013
Hints
What is the formula of the blue-coloured compound formed during the detection of nitrogen by Lassaigne’s test?
1. Fe₃[Fe(CN)₆]₂
2. Fe₄[Fe(CN)₆]₃
3. Fe₄[Fe(CN)₆]₂
4. Fe₃[Fe(CN)₆]₃
1. Fe₃[Fe(CN)₆]₂
2. Fe₄[Fe(CN)₆]₃
3. Fe₄[Fe(CN)₆]₂
4. Fe₃[Fe(CN)₆]₃
Subtopic: Qualitative Analysis of Organic Compounds |
75%
Level 2: 60%+
NEET - 2013
Hints
\(\mathrm{CH_3-CH_3, \ CH_3-CH_2-CH_3, \ }\)
\(\mathrm{\left(CH_3\right)_2 CH-CH_3, }\) and \(\mathrm{CH_3-CH_2-CH\left(CH_3\right)_2 }\)
The increasing order of stability of the free radicals formed from homolytic fission of the above three alkanes is:
| 1. | \(\mathrm{ (CH_3)_2 \dot{C}-CH_2 CH_3<CH_3-\dot{C} H-CH_3 \\ <CH_3-\dot{C} H_2<(CH_3)_3 \dot{C} }\) |
| 2. | \( \mathrm{CH_3-\dot{C} H_2<CH_3-\dot{C} H-CH_3 \\ <\left(CH_3\right)_2 \dot{C}-CH_2 CH_3<\left(CH_3\right)_3 \dot{C}}\) |
| 3. | \(\mathrm{CH_3-\dot{C} H_2<CH_3-\dot{C} H-CH_3\\ <\left(CH_3\right)_3 \dot{C}<\left(CH_3\right)_2 \dot{C}-CH_2 CH_3 }\) |
| 4. | \(\mathrm{ \left(CH_3\right)_3 \dot{C}<\left(CH_3\right)_2 \dot{C}-CH_2-CH_3 \\ <CH_3-\dot{C} H-CH_3<CH_3-\dot{C} H_2 }\) |
Subtopic: Reaction Intermediates ; Preparation & Properties |
79%
Level 2: 60%+
NEET - 2013
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