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Fill in the blanks by choosing the appropriate word/words from those given in the brackets: (square…
(a)[4.0]
Fill in the blanks by choosing the appropriate word/words from those given in the brackets:
(square pyramidal, electrical, 74, 26, $sp^3d^2$, $sp^3d$, chemical, 68, 32, tetrahedral, yellow, white, iodoform, Lucas)
(i) A Galvanic cell converts _______ energy into ______ energy.
(ii) The percentage of unoccupied spaces in bcc and fcc arrangements are _______ and ________ respectively.
(iii) Propan-2-ol on reaction with iodine and sodium hydroxide gives ______ precipitate and the reaction is called ________test.
(iv) The geometry of $\text{XeOF}_4$ molecule is ________ and the hybridisation of xenon atom in the molecule is __________.
(b)[4.0]
Complete the following statements by selecting the correct alternative from the choices given:
(i) During the course of an $\text{S}_\text{N}1$ reaction, the intermediate species formed is:
(1) a carbocation
(2) a free radical
(3) a carbanion
(4) an intermediate complex
(ii) Purification of aluminium by electrolytic refining is called:
(1) Serpeck’s process
(2) Hoope’s process
(3) Hall’s process
(4) Baeyer’s process
(iii) An aqueous solution of urea freezes at $-0\cdot186^\circ\text{C}$, $K_f$ for water = $1\cdot86\text{ K kg mol}^{-1}$, $K_b$ for water = $0\cdot512\text{ K kg mol}^{-1}$. The boiling point of urea solution will be:
(1) $373\cdot065\text{ K}$
(2) $373\cdot186\text{ K}$
(3) $373\cdot512\text{ K}$
(4) $373\cdot0512\text{ K}$
(iv) In the dehydration of alcohols to alkenes by heating with concentrated sulphuric acid, the initiation step is:
(1) formation of carbocation
(2) formation of an ester
(3) protonation of alcohol molecule
(4) elimination of water
(c)[4.0]
Match the following:
Column A
- (i)Rate constant
- (ii)Biodegradable polymer
- (iii)Zwitter ion
- (iv)Purification of colloids
Column B
- (a)Dialysis
- (b)Glycine
- (c)Arrhenius equation
- (d)PHBV
(d)[8.0]
Answer the following questions:
(i) (1) Why does the density of transition elements increase from Titanium to Copper? (at. no. Ti = 22, Cu = 29)
(2) Why is zinc not regarded as a transition element? (at. no. Zn = 30)
(ii) Identify the compounds A, B, C and D:
$\text{CH}_3\text{CN} \xrightarrow{\text{H}_2\text{O}/\text{H}^+} \text{A} \xrightarrow{\text{NH}_3} \text{B} \xrightarrow{\text{heat}} \text{C} \xrightarrow{\text{Br}_2/\text{KOH}} \text{D}$
(iii) Calculate the osmotic pressure of a solution prepared by dissolving $0\cdot025\text{ g}$ of $\text{K}_2\text{SO}_4$ in $2\cdot0\text{ litres}$ of water at $25^\circ\text{C}$ assuming that $\text{K}_2\text{SO}_4$ is completely dissociated. (mol. wt. of $\text{K}_2\text{SO}_4 = 174\text{ g mol}^{-1}$)
(iv) What type of isomerism is shown by the following coordination compounds:
$[\text{PtCl}_2(\text{NH}_3)_4]\text{Br}_2$ and $[\text{PtBr}_2(\text{NH}_3)_4]\text{Cl}_2$
Write their IUPAC names.
Answer
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From ISC 2018 Chemistry Paper 1, question 1.