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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.
A solid substance with a mass of 200g is at its melting temperature in a calorimeter. While the substance changes from a solid to a liquid at the same temperature, the 400-gram mas
Till 20elememts write the no of electrons in outermost shell.if less than 4 then this is the valency otherwise subtract from 8
How much air (volume composition: 21% of oxygen and 79% of nitrogen) is used up in this process? Assume that oxygen and nitrogen behave like ideal gases. The products a
what is equivalent weight of formaldehyde(HCHO)
The four quantum numbers of the outermost orbital of K (atomic no. =19) are: (1) n= 2, l= 0, m=0, s= +1/2 (2) n= 4, l= 0, m=0, s= +1/2 (3) n= 3, l= 1,
The elements of this group form a number of compounds with halogens. The halogen compounds of S. Se, Te and Po are called as halides. For oxygen, only the fluoro compounds
characterstics of s block element
What will be the mole fraction of 98% pure H2SO4 in 1 liter solution which has density 1.85gm/ml at ntp?
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