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The first use of quantum theory to explain the structure of atom was made by: (1) Heisenberg (2 )Bohr (3) Planck (4) Einstein Ans: Bohr
1. A sample of water contains: suspended matter = 100 mg; Ca(NO3)2 = 16.4 mg/L; MgSO4 = 24 mg/L; MgCl2 = 19 mg/L; NaOH = 40 mg/L and KOH = 56 mg/L. Calculate temporary, permanent a
Classification of polymers - Fibres These are the polymers that comprise strong intermolecular forces among the chain. These forces are either hydrogen bonds or dipole-dipole i
20ml of water sample requires 15ml of 0.1mg/l sodium carbonate using phenolphthalein indicator. state the type of acidity and calculate the acidity
Q. Estimation of synthetic food colours in foods? Food colours in various products need to be isolated, identified and then quantitatively measured for their limits. Estimatio
The rate constant for a reaction of Zero order in A is 0.0030 mol L¯¹ s¯¹. How long will it take for the initial concentration of A to fall from 0.10 M to 0.075 M?
Q. What are the characteristics of bases? Ans. Common bases are borax, baking soda, and antacids. These are some characteristics of bases: They taste bitter
why was hydrochloric acid added?
Carboxylate salts Carboxylate salts are less reactive than esters in nucleophilic acyl substitution reactions for two reasons. First, resonance stabilization of carboxylate s
Chromatography - Purification of organic compounds This is a modern technique employed for the separation of mixtures into its components, purification of compounds and as well
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