Question: Radhika made a solution by dissolving 40 g of salt in 100 g of water. Her friend, Saloni took 50 g solution from the solution prepared by Radhika and added 5 g more salt to it. Find the final concentration (w/w%) of this new solution. Solution: Mass of solute = 40 g Mass of […]
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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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Compound X has the molecular formula C4H10O2. X has an unbranched carbon chain and contains two OH groups. On reaction with an excess of hot alkaline potassium permanganate X is converted into a compound of molecular formula C4H6O4.To which two carbon atoms in the chain of X are the two OH groups attached?A. 1st and
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This question is word problem of organic chemistry. The question is provided below: Each of the compounds below is treated separately with excess NaBH4. The product of each reaction is then heated with excess concentrated H2SO4. In each case, one or more products are formed with molecular formula C7H10. Which compounds give only one final product with the molecular
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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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In this post we will discuss about mole concept in detail. Have you seen a ₹ 10 note? Probably yes. How about ₹ 100? Probably yes. Most of us have seen the common denominations of Indian currency ranging from ₹ 10 to ₹ 2000. All of these denominations help in the transaction of money. Similarly,
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To know the concept of writing chemical formula of chemical compound, you should know the following: Symbols of the combining elements Valency of the combining elements Name, Representation and Valency of ions Name, representation and valency of some common ions are given below: Note: You have to remember the valencies given in the above table.
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This post contains multiple choice questions of Is Matter around us pure. 1. A sample of matter containing two or more substances is called a __.(a) Mixture (b) Compound (c) Colloid (d) Suspension 2. Homogeneous mixtures are called __. (a) Solute (b) Solvent (c) Solution (d) Colloid 3. Aqueous solutions of low molecular mass solutes
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In this post, we will discuss about atoms and molecules. Law of chemical combination There are, in all, 5 laws of chemical combination. Here, only two of them, which contributed significantly towards the development of chemistry are described. What is the law of conservation of mass? The law of conservation of mass states that, “during
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Based on the chemical constitution, matter is classified into two kinds: Substances and Mixtures. Substances are further classified into elements and compounds. Elements What is an element? Element is the basic constituent of all matter. An element is the simplest form of matter, which can’t be split into simpler substances by any chemical or physical
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