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Describe why shielding is more effective by electrons in a shell of lower principle quantum number than by electrons having the similar principle quantum number.
The ratio of area covered by second orbital to the first orbital is: (1) 1 : 2 (2) 1 : 16 (3) 8 : 1 (4) 16 : 1 Ans: 16 : 1
Q. Define Conjugate acid-base pair and buffer? Buffers are substances that resist changes in pH. To "balance pH" means to buffer. Weak acids and bases make good buffers.
Physical Properties of Acetic Acid (a) It is a colourless, at ordinary temperature, corrosive liquid along with a sharp pungent odour of vinegar. It has a sour taste. (b) Be
Describe the following electrochemical methods in terms of their working principles instrumentation and applications i. Potentiometry ii. polarography iii. Conductometry
separation of metal
Preparation of dimethylbutan: Procedure: Prepare a mixture of 3,3-dimethylbutan-2-one (trivial name pinacolone; 20.0 g, 0.200 moles), redistilled benzaldehyde (24.0 g,
why isoquinoline is weak base as compare to quinoline?
density of gas is 2.86 ltr.the gas may be-
Q. Taste interactions affecting taste quality? Taste interactions- Foods contain a mixture of substances which elicit all four sensations. Modification of one sensation takes p
The diffraction of x-ray by a crystal gives 1st order ref at 14•12'' if lattice dist is 3.14 A• wht is the wavelength of x-ray
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