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About 98 per cent of the mass of everv l...

About 98 per cent of the mass of everv living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and

A

phosphorous and sulphur

B

sulphur and magnesium

C

magnesium and sodium

D

Calcium and phosphorous

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A
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About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and

About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and

About 98 percent of the mass of every living organism is composed fo just six elements including carbon, hydrogen , nitroge , oxygen and

98% of all living organisms is made up of just following number of elements.

Give the formulae of the compounds formed from the following sets of elements. a) Calcium and fluorine b) Hydrogen and sulphur c) Nitrogen and hydrogen d) Carbon and chlorine e) Sodium and oxygen f) Carbon and oxygen

95 " mL of " a mixture of a gaseous organic compound A and just sufficient amount of oxygen required for the complete yields on burning 40 " mL of " CO_2 and 70 " mL of " water vapour along with 10 " mL of " nitrogen,volumes measured at the same temperature and pressure. Compound A contains corbon, hydrogen, and nitrogen only as the constituent elements. Calculate. (a). The volume of O_2 required for complete combustion (b). The molecular formula of A.

Match the following lists : List 1 List 2 Property to be determined Method used for determination ( A ) Molecular mass of a volatile oragnic solid 1. Silver salt method (B ) Molecular mass of anon-volatile organic solid 2. Liebig method ( C ) Estimation of chlorine in carbon tetrachloride 3. Platinichloride method ( D ) Estimation of nitrogen in aniline 4. Victor Meyer's method ( E ) Equivalent mass of an organic acid 5. Depression in freezing point ( F ) Equivalent mass of an organic base 7. Carius method ( G ) Estimation of carbon and hydrogen in an organic 7. Kjeldahl's method compound Codes :

Nirtobenzene is formed as the major product along with a minor product in the reaction of benzene with a hot mixture of nitric acid and sulphuric acid. The minor product consists of carbon 42.86% , hydrogen 2.40% , nitrogen 16.67% and oxygen 38.07% . a. Calculate the empirical formula of the minor product. b. When 5.5 g of the minor product is dissolved in 45 g of benzene, the boiling point of the solution is 1.84 C higher than that of pure benzen. Calculate the molar mass of the minor product and determine its molecular and structural formulae. (Molar elevation constant of benzene is 2.53 K kg mol^(-1))

On strong heating, one gram of the silver salt of an organic dibasic acid yields 0.5934g of silver. If the mass percentage of carbon in it 8 times the mass percentage of hydrogen and one-half the mass percentage of oxygen, determine the molecular formula of the acid.

(a) Illustrate the following name reactions by giving example : (i) Cannizzaro's reaction (ii) Clemmensen reduction (b) An organic compound A contains 69.77 % carbon , 11.63 % hydrogen and rest oxygen . The molecular mass of the compound is 86. it does not reduce Tollen's reagent but forms an addition compound with sodium hydrogen sulphite and give positive iodoform test. On vigorous oxidation it gives ethanoic and propanoic acid. Derive the possible structure of compound A .

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