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CBSE Topper Answer Sheet Class 12 Chemistry
| Academic Year | Topper Answer Sheet |
| Class 12 Chemistry Topper Answer Sheet 2018 | <a href="https://drive.google.com/uc?export=download&id=1rK7xoVpPVWdldC1TVJ9_XxBDj3Ue5y0m">PDF Download</a> |
| Class 12 Chemistry Topper Answer Sheet 2017 | <a href="https://drive.google.com/uc?export=download&id=1CxGZqD9yRdtmt5AxUPDl7AtT8kEEQwF2">PDF Download</a> |
| Class 12 Chemistry Toppers Answer Sheet 2016 | <a href="https://drive.google.com/uc?export=download&id=1FnLrtKaZesA5erWlcKWyTh4vlyIjPb7_">PDF Download</a> |
| Class 12 Chemistry Toppers Answer Sheet 2014 | <a href="https://drive.google.com/uc?export=download&id=1Ip6_2JZvNZc3WmEOKSmmztu5jetBQ7gF">Download PDF</a> |
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Krishna Yadav 22 hours ago
Yogita Ingle 22 hours ago
The maximum amount of solute that can dissolve in a known quantity of solvent at a certain temperature is its solubility.
The solubility of a substance depends on the physical and chemical properties of that substance. In addition to this, there are a few conditions which can manipulate it. Temperature, pressure and the type of bond and forces between the particles are few among them.
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Temperature: By changing the temperature we can increase the soluble property of a solute. Generally, water dissolves solutes at 20° C or 100° C. Sparingly soluble solid or liquid substances can be dissolved completely by increasing the temperature. But in the case of gaseous substance, temperature inversely influences solubility i.e. as the temperature increases gases expand and escapes from their solvent.
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Forces and Bonds: Like dissolves in like. The type of intermolecular forces and bonds vary among each molecule. The chances of solubility between two unlike substances are more challengeable than the like substances. For example, water is a polar solvent where a polar solute like ethanol is easily soluble.
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Pressure: Gaseous substances are much influenced than solids and liquids by pressure. When the partial pressure of gas increases, the chance of its solubility is also increased. A soda bottle is an example of where CO2 is bottled under high pressure.
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Sanjana Dua 1 day, 5 hours ago
Posted by Tanya Sharma 💖💖 1 day, 7 hours ago
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Gaurav Seth 1 day, 6 hours ago
Given that the rate constant for a first order reaction is 60 s−1.
Let a M be the initial concentration.
Final concentration will be 16a M.
Rate constant, k=60/s
Time = 0.0462 sec-1
Posted by Sandeep Bhardwaj 1 day, 7 hours ago
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Yogita Ingle 1 day, 7 hours ago
Conductivity of a solution is defined as the conductance of a solution of 1 cm in length and area of cross-section 1 sq. cm. The inverse of resistivity is called conductivity or specific conductance. It is represented by the symbol k. If p is resistivity, then we can write:
k = 1 / p
Molar conductivity of a solution at a given concentration is the conductance of volume V of a solution containing 1 mole of the electrolyte kept between two electrodes with the area of cross-section A and distance of unit length.
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Akanksha Kumari 1 day, 7 hours ago
Posted by Randhawa Kaur 1 day, 8 hours ago
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Yogita Ingle 1 day, 7 hours ago
(i) The coordination number of an atom, ion or molecule is the number of constituent particles which touch that particular atom, atom or molecule.
(ii)
(a) in a cubic close packed structure coordination number is 12
(b) ) in a body–centered cubic structure coordination number is 8.
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Yogita Ingle 1 day, 10 hours ago
The inert pair theory was proposed by Sidgwick. He along with Powell accounted for the shapes of several molecules and correlated the shapes with some of their physical properties.
nert pair effect is defined as The non-participation of the two s electrons in bonding due to the high energy needed for unpairing them.
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Yogita Ingle 2 days, 22 hours ago
The structure of the compound 3-Hydroxy butanal is shown here-
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Sanjana Dua 2 days, 5 hours ago
Mr. Badmash 2 days, 18 hours ago
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Shweta😀 Dhama😍 2 days, 18 hours ago
Tanya Sharma 💖💖 3 days, 6 hours ago
Posted by Keshav Joshi 3 days, 7 hours ago
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Yogita Ingle 3 days, 7 hours ago
The dialysis is a separation process that depends on the differential transport of solutes of different sizes across a porous barrier separating two liquids when the driving force is a concentration gradient only. It is usually used to separate solutes too large to diffuse through the barrier from those small enough to diffuse freely through it. The ultrafiltration, sometimes called reverse osmosis, is a more complicated process in that the solvent and solutes up to a certain critical size are forced through the barrier by considerably higher pressure on one side of the porous barrier than on the other. Thus, there is always a flow of solvent moving through the barrier in the same direction as the smaller solutes that are able to pass through the membrane. This sets it apart from dialysis where, owing to osmosis, there is usually a certain net movement of solvent in the direction opposite to the movement of solute.
Gaurav Seth 3 days, 7 hours ago
Dialysis is a clinical application that helps patients to clean their blood artificially while the ultrafiltration is a process that occurs naturally during the urine formation in our kidneys. Furthermore, in dialysis, solutes move from high concentration to low concentration along the electrochemical gradient. But in ultrafiltration, the substances travel due to a pressure gradient. Hence, this is another difference between dialysis and ultrafiltration. Moreover, dialysis occurs in a dialyzer or the membrane lining of our abdomen while ultrafiltration takes place between the glomerulus and the Bowman’s capsule of the nephron.
Furthermore, the rate of ultrafiltration depends on the porosity of the membrane and the speed of blood flow (or the pressure created by the blood flow) while the dialysis rate depends on the dialysate flow rate. Thus, this is also a difference between dialysis and ultrafiltration.
Posted by Shubham Vyas 3 days, 8 hours ago
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Yogita Ingle 3 days, 6 hours ago
The metal-carbon bonds in metal carbonyls have both σ and π characters. A σ bond is formed when the carbonyl carbon donates a lone pair of electrons to the vacant orbital of the metal. A π bond is formed by the donation of a pair of electrons from the filled metal d orbital into the vacant anti-bonding π orbital (also known as back bonding of the carbonyl group). The σ bond strengthens the π bond and vice-versa. Thus, a synergic effect is created due to this metal-ligand bonding. This synergic effect strengthens the bond between CO and the metal.
Posted by Keshav Joshi 3 days, 9 hours ago
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Gaurav Seth 3 days, 9 hours ago
The Cl-,Br- and CN- nucleophiles can easily be introduced in the benzene in the presence of Cu(I) ion. This reaction is called sand Meyer's reaction.
It is used to synthesize aryl halides from aryl diazonium salts. It is an example of a radical-nucleophilic aromatic substitution.
When a primary aromatic amine, dissolved or suspended in cold aqueous mineral acid, is treated with sodium nitrite, a diazonium salt is formed. Mixing the solution of freshly prepared diazonium salt with cuprous chloride or cuprous bromide results in the replacement of the diazonium group by −Cl or −Br.
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