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During a flame test why is calcium''s flame not persistent, while that of strontium is?
Ans) Because it does not have many ions as compared to the Strontium. It is the ions which produce color.
In Bohr's model, atomic radius of the first orbit is γ the radius of the 3rd orbit, is: (1) γ/ 3 (2)γ (3) 3γ (4) 9γ Ans: 9γ
Be 2+ is isoelectronic with: (1) Mg 2+ (2) Na + (3) Li + (4) H + Ans: Li +
uses of laboratory apparatus
Define Composition of individual phase in phase diagram–three phase? A binary system with three phases has only one degree of freedom and cannot be represented by an area on a
what is colloid?
respiration. is it a exothermic or endothermic
Q. Determine Equilibrium Constants for Acid and base? Ans. The pH scale of acidity is a simple and convenient way to state the acidity of a solution. The
The energy that opposes dissolution of a solvent is: (1) Hydration energy (2) Lattice energy (3) Internal energy (4) Bond energy Ans: B
what are the demerits of Bohr''s atomic model?
Ask question #MinimName two compound that are covalent when taken pure but produce ions when dissolved in water. um00 words accepted#
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