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Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.
However, the Term-I examination was criticised by many for having wrong answer keys, tough question papers and wrong or controversial questions, with a question being dropped in Sociology exam of class 12 and a paragraph in the English Language and Literature exam for class 10 by CBSE following which CBSE dropped the experts who set the ...
A 12th grade visual arts class in Scott County, Virginia in the United States. Twelfth Grade (also known as 12th Grade, Grade 12, Senior Year, Standard 12, 12th Standard, Class 12 or 12th Class) is the twelfth and final year of formal or compulsory education. It is typically the final year of secondary school and K–12 in most parts of the ...
In chemistry, the common-ion effect refers to the decrease in solubility of an ionic precipitate by the addition to the solution of a soluble compound with an ion in common with the precipitate. [1] This behaviour is a consequence of Le Chatelier's principle for the equilibrium reaction of the ionic association / dissociation .
Chemical thermodynamics involves not only laboratory measurements of various thermodynamic properties, but also the application of mathematical methods to the study of chemical questions and the spontaneity of processes. The structure of chemical thermodynamics is based on the first two laws of thermodynamics. Starting from the first and second ...
From 2012, the old pattern was Phased out and the WBJEE would consist of only MCQ questions which differs from the previous years by the fact that 2 Marks Short answers type questions are replaced by MCQ with the same weightage of marks. In 2016 there will be a different type of pattern in Biology question paper. Category-I consists of (Q.1 to ...
In chemistry, neutralization or neutralisation (see spelling differences) is a chemical reaction in which acid and a base react with an equivalent quantity of each other. In a reaction in water, neutralization results in there being no excess of hydrogen or hydroxide ions present in the solution.
Change of marks weightage of 1200 by dividing into two, one for 11th and another 12th so that 11th grade is for 600 and 12th for 600. changes in marksheet by adding both 11th and 12th. marks reduction of exam hours from three and half to 2 and half hours. 2019 Introduction of public examination for classes 5th and 8th.