Advay Dubey - 647

a. Cis- 2 -butene rarr trans- 2 -butane, DeltaH_(1) b. Cis- 2 -butane rarr1 -butene, DeltaH_(2) c. Trans- 2 -butene is more stable than C is- 2 -butene d. Ethalpy of combustion of 1 -butene, DeltaH =- 649.8 kcal//mol e. 9DeltaH_(1) +5DeltaH_(2) = 0 f. Enthalpy of combustion of trans -2 -butene, DeltaH =- 647.1 kcal mol^(-1) . Calculate DeltaH_(1) and DeltaH_(2) ?

The temperature at which the surface tension of water is zero (1) 370^(@)C (2) 0^(@)C (3) Slightly less than 647 K (4) 277 K

15 g sample of an alloy containing Cu and Zn reacts completely with 3M HNO_(3) as, Cu+HNO_(3)rarrCu^(2+)+NO_(2(g))+H_(2)O Zn+HNO_(3)rarrZn^(2+)+NH_(4)^(+)+H_(2)O The liberated NO_(2(g)) was found to be 4.647 "litre" at 1 atm and 300 K . Find the amount of zince ( to the closest value) in alloy. (Cu-63.6, R=0.0821)

A" " 5.0 g sample of felspar containing Na_(2)O,K_(2)O and some inert impurity is dissolved in dilute HCl solution and NaCl and KCl formed are separated by fractional crystallization. During crystallization some less soluble impurities also come out. Mass of NaCl, KCl and impurity accompanying these salts was found to be 6.47 g . Solid crystal was then re-dissolved and required 300mL of 0.3M AgNO_(3) for complete precipitation of chlorides. The precipitate this, obtained ws found to contain 4.23% insoluble impurity. Determine mass percentage of Na_(2)O and K_(2)O in the original sample:

Find the value of the following using various properties: (i) 647xx13+647xx7 (ii) 9870xx561-9870xx461 (iii) 569xx17+569xx13+569xx70