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Chlorine is prepared in the laboratory by treating manganese dioxide (MnO2) with aqueous hydrochloric acid according to the reaction
\[\ce{4HCl_{(aq)} + MnO_{2(s)} → 2H2O_{(l)} + MnCl_{2(aq)} + Cl_{2(g)}}\]
How many grams of HCl react with 5.0 g of manganese dioxide?
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Symbols `""_35^79"Br"` and `""^79"Br"` can be written, whereas symbols `""_79^35"Br"` and `""^35"Br"` are not acceptable. Answer briefly.
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The quantum numbers of six electrons are given below. Arrange them in order of increasing energies. If any of these combination(s) has/have the same energy lists:
- n = 4, l = 2, ml = –2 , ms = - 1/2
- n = 3, l = 2, ml= 1 , ms = +1/2
- n = 4, l = 1, ml = 0 , ms = +1/2
- n = 3, l = 2, ml = –2 , ms = –1/2
- n = 3, l = 1, ml = –1 , ms= +1/2
- n = 4, l = 1, ml = 0 , ms = +1/2
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How many sub-shells are associated with n = 4?
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How many electrons will be present in the sub-shells having ms value of - 1/2 for n = 4?
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Explain the physical significance of Van der Waals parameters.
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Knowing the properties of H2O and D2O, do you think that D2O can be used for drinking purposes?
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What is \[\ce{SI}\] unit of viscosity coefficient (η)?
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Write redox reaction between fluorine and water.
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Correlate the items listed in Column I with those listed in Column II. Find out as many correlations as you can.
| Column I | Column II |
| (i) Synthesis gas | (a) \[\ce{Na2 [Na4(PO3)6]}\] |
| (ii) Dihydrogen | (b) Oxidising agent |
| (iii) Heavy water | (c) Softening of water |
| (iv) Calgon | (d) Reducing agent |
| (v) Hydrogen peroxide | (e) Stoichiometric compounds of s-block elements |
| (v) Salt like hydrides | (f) Prolonged electrolysis of water |
| (g) \[\ce{Zn + NaOH}\] | |
| (h) \[\ce{Zn + dil. H2SO4}\] | |
| (i) Synthesis of methanol | |
| (j) Mixture of \[\ce{CO}\] and \[\ce{H2}\] |
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Match the terms in Column I with the relevant item in Column II.
| Column I | Column II |
| (i) Electrolysis of water produces | (a) atomic reactor |
| (ii) Lithium aluminium hydride is used as | (b) polar molecule |
| (iii) Hydrogen chloride is a | (c) recombines on metal surface to generate high temperature |
| (iv) Heavy water is used in | (d) reducing agent |
| (v) Atomic hydrogen | (e) hydrogen and oxygen |
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In a reaction, \[\ce{A + B2 -> AB2}\]
Identify the limiting reagent, if any, in the following reaction mixture.
300 atoms of A + 200 molecules of B
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In a reaction, \[\ce{A + B2 -> AB2}\]
Identify the limiting reagent, if any, in the following reaction mixture.
2 mol A + 3 mol B
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In a reaction, \[\ce{A + B2 -> AB2}\]
Identify the limiting reagent, if any, in the following reaction mixture.
100 atoms of A + 100 molecules of B
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In a reaction, \[\ce{A + B2 -> AB2}\]
Identify the limiting reagent, if any, in the following reaction mixture.
5 mol A + 2.5 mol B
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In a reaction, \[\ce{A + B2 -> AB2}\]
Identify the limiting reagent, if any, in the following reaction mixture.
2.5 mol A + 5 mol B
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Apart from tetrahedral geometry, another possible geometry for CH4 is square planar with the four H atoms at the corners of the square and the C atom at its centre. Explain why CH4 is not square planar?
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Draw a diagram showing the formation of a double bond and a triple bond between carbon atoms in C2H4 and C2H2 molecules.
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What is the total number of sigma and pi bonds in the following molecules?
C2H2
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What do you understand by bond pairs and lone pairs of electrons? Illustrate by giving one example of each type.
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