In this post, you will find the important reactions of p-block elements for class 12. The p-block elements, also known as the main group elements, are located in groups 13 to 18 of the periodic table. These elements play a crucial role in various chemical reactions and display diverse properties due to their electron configurations. […]
95 Important Reactions of P-block elements for Class 12 Read More »
Are you preparing for IIT-JEE or NEET? If yes, then it becomes your necessity to remember periodic table. When we talk about Chemistry, then we never forget to discuss about the periodic table. We even try to find among friends, who knows the complete periodic table. The periodic table is fundamental & very important that
Best Tricks to Remember Periodic Table | English & Hindi Read More »
Question: Write the name, stereochemistry and magnetic behaviour of the following: (At. nos. Mn = 25, Co = 27, Ni = 28) (i) K4[Mn(CN)6] (ii) [Co(NH3)5Cl]Cl2 (iii) K2[Ni(CN)4] (To remember: Oxidation state of K is +1 Oxidation state of CN is -1 Oxidation state of NH3 is 0 Oxidation state of Cl is -1)
Coordination Chemistry Questions from Delhi 2011 Read More »
It is a question based on stoichiometric calculation. How many moles of UF6 would have to be decomposed to provide enough fluorine to prepare 1.25 mol of CF4 ? (Assume sufficient carbon is available) Solution: The chemical reaction occurs is: UF6→ U + 3F2 ……….. (1) C + 2F2→ CF4 ……….. (2) From reaction (2),
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How many moles of lead(II) chloride will be formed from a reaction between 6.5 g PbO and 3.2 g HCl? Solution: The reaction between PbO and HCl is: PbO + 2 HCl → PbCl2+ H2O From the reaction it is clear that 1 mole PbO reacts with 2 mole of HCl. Now, moles of PbO = Given
In this post, we will discuss about Dalton’s Atomic Theory. Dalton based his theory on two laws: the law of conservation of mass and the law of constant composition. The law of conservation of mass says that matter is not created or destroyed in a closed system. That means if we have a chemical reaction, the amount
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In this post we, will discuss about the quantum numbers and its types. The set of numbers used to describe the position and energy of the electron in an atom are called quantum numbers. There are four quantum numbers, namely, principal, azimuthal, magnetic and spin quantum numbers. Electronic quantum numbers (the quantum numbers describing electrons)
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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
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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.
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