Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first? Justify your answer. If the static electric charge on the oil drop is –1.282 × 10 –18C, calculate the number of electrons present on it. In Milikan’s experiment, static electric charge on the oil drops has been obtained by shining X-rays. What would be the SI unit for the quantity pV 2 T 2/ n?
Justify the position of hydrogen in the periodic table on the basis of its electronic configuration. If the caesium element is irradiated with a wavelength 500 nm, calculate the kinetic energy and the velocity of the ejected photoelectron. (b) the threshold frequency of the radiation. The work function for caesium atom is 1.9 eV. Calculate the rate of emission of quanta per second. Recently Viewed Questions of Class 11 ChemistryĪ 25 watt bulb emits monochromatic yellow light of wavelength of 0.57μm. Which one of the following will have largest number of atoms?ĭensity of a gas is found to be 5.46 g/dm 3 at 27 ☌ at 2 bar pressure. (iii) 100 atoms of A + 100 molecules of BĪt 0☌, the density of a certain oxide of a gas at 2 bar is same as that of dinitrogen at 5 bar. In a reaction A + B2 → AB2 Identify the limiting reagent, if any, in the following reaction mixtures. What will be the minimum pressure required to compress 500 dm 3 of air at 1 bar to 200 dm 3 at 30☌? 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. The dipole moment of a molecule is therefore the vector sum of the dipole moments of the. (c) H 2O 2 (aq) + Fe 2+ (aq) → Fe 3+ (aq) + H 2O (l) (in acidic solution) BCl3, for example, has no dipole moment, while NH3 does. (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) Lewis Structure of BCl3 If we look at the Boron Trichloride’s molecular geometry, it is Trigonal Planar with a bond angle of 120 degrees. (iii) 2 moles of carbon are burnt in 16 g of dioxygen.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 : No such dipole exists in BCl3 and thus its dipole moment is zero and it is non-polar. (ii) 1 mole of carbon is burnt in 16 g of dioxygen. is 3.0 × 10 –25 J, calculate its wavelength.Ĭalculate the amount of carbon dioxide that could be produced when The mass of an electron is 9.1 × 10 –31 kg.
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