Law of multiple proportions states that if two elements form more than one compound, then the ratios of the masses of the second element which combine with a fixed mass of the first element will always be ratios of small whole numbers. This law is sometimes called Dalton’s Law, named after John Dalton, the chemist who first expressed it. 2.66 g chloride […]
Law of multiple proportions Read More »
Given mass of CO2 = 200 mg = 0.2 g Molar mass of CO2 = 44 g/mol Number of moles of 200 mg CO2 = Given mass/Molar mass of CO2 = 0.2 g/44 g mol-1 = 0.00454 mole Number of molecules of CO2 removed = 1021 Number of moles of CO2 removed = 1021/(6.022*1023) =
From 200 mg of CO2, 10^21 molecules are removed. How many moles of CO2 are left? Read More »
Q. Assertion : The element having with electronic configuration 1s2 2s2 2p6 3s2 and 1s2 2s2 belong to the same group Reason: Both have same number of electrons in the valence shell Solution: Elements having same number of valence shell are present in same group. Here, each elements have 2 valence electrons.
Assertion-Reason based electronic configuration Read More »
In KMnO4, oxidation state of Mn is +7. As the oxidation state of atom increases, the element become more electronegative in nature. Mn gain 5 electron in acidic medium and reduces to +2 oxidation state. Gain of 5 electron shows that the electronegativity of Mn has increased. Therefore, KMnO4 is a good oxidizing agent. Note:
Why KMnO4 act as a good oxidizing agent in acidic medium? Read More »
Solution: Bond angle is inversely proportional to electronegativity of substituents. i.e., Electronegativity of side atom increase then the bond angle (X-P-X) decreases. So, X-P-X or F-P-F bond angle is least in POF3. That’s why the O-P-F is maximum. Hence, the correct order of bond angle for O-P-X in the given molecules
What is the correct order of bond angle for O-P-X in the given molecules? Read More »
Which species has the maximum number of lone pairs of electrons on the central atom? (a) ClO3– (b) XeF4 (c) SF4 (d) I3– First of all, let’s discuss the term lone pair, hybridisation and bond pair What is lone pair? A pair of electrons occupying an orbital in an atom or molecule and not directly
Which species has maximum number of lone pair? Read More »
The equal volume of two HCl solutions of pH=3 and pH=5 were mixed. What is the pH of the resulting solution? To calculate the pH of the resulting solution from the two solutions whose pH values are known. Firstly, calculate hydrogen ion concentration of both the solutions with the help of pH formula. We know
What is the pH of the resulting solution? Read More »
