Q1. multi:
cooloidal gold can be prepared by
(a) bredig's arc method
(b) reduction of AuCl3
(c) hydrolysis
(d) peptization
Q2. multi:
Select correct statements
(a) Buring carbylamine rkn, intermediate is carbene
(b) During Dow's process, RI (rkn intermediate) is benzyne
(c) Enolate ion is RI in acid catalysed aldol
(d) Triplet carbene is paramagnetic
btw. is benzyne and carbene in syllabus?
Q3. single:
Debye Huckle Onsager equation is written as
\pi_{m} = \pi^{o}_{m} - (A+B\pi^{o}_{m})\sqrt{C}
A and B for water are 60.2 and 0.229, then in the folowing graph, HCl is ___
(the graphs are for AgNO3, NaNO3, HCl, KCl)
Q4. integer:
In a sample of two H atom, light of frequency which excite electron to 3rd excited state. Then max. no. of spectral line obtained in emission spectrum is x. x = ___
Q5. No. of pi-electrons in benzyne = ____
Q6. In H-atom, electron makes transition from n2 to n1 and can give 6 specrtal lines and max. no. of spectral lines obtained = 5. Then possible value of n1+n2 is ___ (integer)
Q7. How many types of stereoisomerism are possible for [Zn(CN)BrCl(H2O)]- _____ (does linkage isomerism count in stereoisomerism?)
29
