In a reaction A + B2 → AB2 Identify the limiting reagent, if any, in the following reaction mixtures. What is the change in internal energy for the process?
In a process, 701 J of heat is absorbed by a system and 394 J ofwork is done by the system. What will be the minimum pressure required to compress 500 dm 3 of air at 1 bar to 200 dm 3 at 30☌? (c) H 2O 2 (aq) + Fe 2+ (aq) → Fe 3+ (aq) + H 2O (l) (in acidic solution) (b) MnO 4 – (aq) + SO 2 (g) → Mn 2+ (aq) + HSO 4 – (aq) (in acidic solution) (a) MnO 4 – (aq) + I – (aq) → MnO 2 (s) + I 2(s) (in basic medium) is 3.0 × 10 –25 J, calculate its wavelength.Ĭalculate the wavelength of an electron moving with a velocity of 2.05 × 10 7 ms –1.īalance the following redox reactions by ion – electron method : The mass of an electron is 9.1 × 10 –31 kg. (iii) 2 moles of carbon are burnt in 16 g of dioxygen. (ii) 1 mole of carbon is burnt in 16 g of dioxygen.
For example, the ionic radius of F– ion is 136 pm, whereas the atomic radius of F atom is 64 pm.Ĭalculate the amount of carbon dioxide that could be produced when This is because an anion has the same nuclear charge, but more electrons than the parent atom resulting in an increased repulsion among the electrons and a decrease in the effective nuclear charge. On the other hand, an anion is larger in size than its parent atom. For example, the ionic radius of Na+ ion is 95 pm, whereas the atomic radius of Na atom is 186 pm. Thus, a cation is smaller than the parent atom. Since a cation is formed by removing an electron from an atom, the cation has fewer electrons than the parent atom resulting in an increase in the effective nuclear charge. The ionic radii can be calculated by measuring the distances between the cations and anions in ionic crystals. It is defined as the distance from the centre of the nucleus of the ion upto which it exerts its influence on the electron cloud. Ionic radius means the radius of an ion (cation or anion). It is of 3 types:Ī) Covalent radius- It is the one half of the distance between the centres of the nuclei of two adjacent similar atoms joined to each other by single covalent bond.Ĭovalent radius = inter nuclear distance in the bonded atoms/ 2ī) Metallic radius- It is defined as half the distance between the centres of the nuclei of two adjacent atoms in the metallic crystal.Ĭ) Van der waal’s radius- It is defined as one half of the inter nuclear distance between 2 similar adjacent atoms belonging to the two neighbouring molecules of the same substance in the solid state. Atomic radius and ionic radius are the periodic properties which are directly or indirectly related to the electronic configuration of their atoms and shows gradation on moving down a group or along a period.Ītomic radius is defined as the distance from the centre of the nucleus to the outer most shell containing the electrons.
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