Advertisements
Advertisements
The largest oxidation number exhibited by an element depends on its outer electronic configuration. With which of the following outer electronic configurations the element will exhibit largest oxidation number?
Concept: undefined >> undefined
The exhibition of various oxidation states by an element is also related to the outer orbital electronic configuration of its atom. Atom(s) having which of the following outermost electronic configurations will exhibit more than one oxidation state in its compounds.
(i) 3s1
(ii) 3d14s2
(iii) 3d24s2
(iv) 3s23p3
Concept: undefined >> undefined
Advertisements
The reaction \[\ce{Cl2 (g) + 2OH- (aq) -> ClO- (aq) + Cl- (aq) + H2O (l)}\] represents the process of bleaching. Identify and name the species that bleaches the substances due to its oxidising action.
Concept: undefined >> undefined
\[\ce{PbO}\] and \[\ce{PbO2}\] react with \[\ce{HCl}] according to following chemical equations:
\[\ce{2PbO + 4HCl -> 2PbCl2 + 2H2O}\]
\[\ce{PbO2 + 4HCl -> PbCl2 + Cl2 + 2H2O}\]
Why do these compounds differ in their reactivity?
Concept: undefined >> undefined
Nitric acid is an oxidising agent and reacts with \[\ce{PbO}\] but it does not react with \[\ce{PbO2}\]. Explain why?
Concept: undefined >> undefined
Calculate the oxidation number of phosphorus in the following species.
\[\ce{HPO^{2-}3}\]
Concept: undefined >> undefined
Calculate the oxidation number of phosphorus in the following species.
\[\ce{PO^{3-}4}\]
Concept: undefined >> undefined
Calculate the oxidation number of sulphur atom in the following compounds:
\[\ce{Na2S2O3}\]
Concept: undefined >> undefined
Calculate the oxidation number of sulphur atom in the following compounds:
\[\ce{Na2S4O6}\]
Concept: undefined >> undefined
Calculate the oxidation number of sulphur atom in the following compounds:
\[\ce{Na2SO3}\]
Concept: undefined >> undefined
Calculate the oxidation number of sulphur atom in the following compounds:
\[\ce{Na2SO4}\]
Concept: undefined >> undefined
Match Column I with Column II for the oxidation states of the central atoms.
| Column I | Column II |
| (i) \[\ce{Cr2O^{2-}7}\] | (a) + 3 |
| (ii) \[\ce{MnO^{-}4}\] | (b) + 4 |
| (iii) \[\ce{VO^{-}3}\] | (c) + 5 |
| (iv) \[\ce{FeF^{3-}6}\] | (d) + 6 |
| (e) + 7 |
Concept: undefined >> undefined
Match Column I with Column II for the oxidation states of the central atoms.
| Column I | Column II | |
| (i) | Ions having positive charge | (a) +7 |
| (ii) | The sum of oxidation number of all atoms in a neutral molecule |
(b) –1 |
| (iii) | Oxidation number of hydrogen ion \[\ce{(H+)}\] | (c) +1 |
| (iv) | Oxidation number of fluorine in \[\ce{NaF}\] | (d) 0 |
| (v) | Ions having negative charge | (e) Cation |
| (f) Anion |
Concept: undefined >> undefined
Which of the following reactions increases production of dihydrogen from synthesis gas?
Concept: undefined >> undefined
Match Column I with Column II for the given properties/applications mentioned therein.
| Column I | Column II |
| (i) \[\ce{H}\] | (a) Used in the name of perhydrol. |
| (ii) \[\ce{H2}\] | (b) Can be reduced to dihydrogen by \[\ce{NaH}\]. |
| (iii) \[\ce{H2O}\] | (c) Can be used in hydroformylation of olefin. |
| (iv) \[\ce{H2O2}\] | (d) Can be used in cutting and welding. |
Concept: undefined >> undefined
Atomic hydrogen combines with almost all elements but molecular hydrogen does not. Explain.
Concept: undefined >> undefined
How can \[\ce{D2O}\] be prepared from water? Mention the physical properties in which \[\ce{D2O}\] differs from \[\ce{H2O}\]. Give at least three reactions of \[\ce{D2O}\] showing the exchange of hydrogen with deuterium.
Concept: undefined >> undefined
Amphoteric hydroxides react with both alkalies and acids. Which of the following Group 2 metal hydroxides is soluble in sodium hydroxide?
Concept: undefined >> undefined
The formula of soda ash is ______.
Concept: undefined >> undefined
A chemical A is used for the preparation of washing soda to recover ammonia. When CO2 is bubbled through an aqueous solution of A, the solution turns milky. It is used in whitewashing due to disinfectant nature. What is the chemical formula of A?
Concept: undefined >> undefined
