Please select a subject first
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The best and latest technique for isolation, purification and separation of organic compounds is ______.
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Ionic product of water at 310 K is 2.7 × 10–14. What is the pH of neutral water at this temperature?
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The concentration of sulphide ion in 0.1M HCl solution saturated with hydrogen sulphide is 1.0 × 10–19 M. If 10 mL of this is added to 5 mL of 0.04 M solution of the following: FeSO4, MnCl2, ZnCl2 and CdCl2. in which of these solutions precipitation will take place?
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For the electrons of oxygen atom, which of the following statements is correct?
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Give reasons for the following:
Water molecule has bent structure whereas carbon dioxide molecule is linear.
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Group the following as linear and non-linear molecules:
\[\ce{H2O, HOCl, BeCl2, Cl2O}\]
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Which of the following is not correct?
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Given that ∆H = 0 for mixing of two gases. Explain whether the diffusion of these gases into each other in a closed container is a spontaneous process or not?
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Identify the state and path functions out of the following:
- Enthalpy
- Entropy
- Heat
- Temperature
- Work
- Free energy
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What will be the correct order of vapour pressure of water, acetone and ether at 30°C. Given that among these compounds, water has maximum boiling point and ether has minimum boiling point?
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Calculate the volume of water required to dissolve 0.1 g lead (II) chloride to get a saturated solution. \[\ce{(K_{sp} of PbCl2}\] = 3.2 × 10–8, atomic mass of \[\ce{Pb = 207 u}\]).
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During hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. According to you which technique can give the best results?
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The principle involved in paper chromatography is ______.
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What will be the product obtained as a result of the following reaction and why?
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Suggest a route for the preparation of nitrobenzene starting from acetylene?
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Match the following reactants in Column I with the corresponding reaction products in Column II.
| Column I | Column II |
| (i) \[\ce{Benzene + Cl2 ->[AlCl3]}\] | (a) Benzoic acid |
| (ii) \[\ce{Benzene + CH3Cl ->[AlCl3]}\] | (b) Methyl phenyl ketone |
| (iii) \[\ce{Benzene + CH3COCl ->[AlCl3]}\] | (c) Toluene |
| (iv) \[\ce{Toluene ->[KMnO4/NaOH]}\] | (d) Chlorobenzene |
| (e) Benzene hexachloride |
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Which atom is indicated by the following configuration?
[He] 2s1
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Which atom is indicated by the following configuration?
[Ne] 3s2 3p3
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Which atom is indicated by the following configuration?
[Ar] 4s2 3d1.
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An atomic orbital has n = 3. What are the possible values of l and ml?
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