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Answers posted by mosymeow_1

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answered Feb 24, 2014
Toolbox:Work done on the system W= - 2.303 nRT log$\frac{V_2}{V_1}$Answer: 2.303 kcalSince, work don...
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answered Feb 24, 2014
Answer: -0.9 kJ$W = - P \Delta V$$P = 10^5 Nm^{-2}$ = 1 atm$\Delta V$ = 10 -1 = 9 Litres [$1m^3 = 10...
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answered Feb 24, 2014
Answer: 1200 K$\Delta H$ = 170,000 J and $\Delta S = 170 JK^{-1}$When, $\Delta G = 0$ (equilibrium)A...
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answered Feb 24, 2014
Answer: 508.8 kJ$T_2$ = 100 + 273 = 373 K and$T_1$ = 0 + 273 = 273 KQ = 453.6 kcal = 453.6 $\times$...
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answered Feb 24, 2014
Toolbox:Efficiency of a heat engine, $\eta = 1 - \frac{T_1}{T_2}$ Answer: 90%Since, efficiency of a ...
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answered Feb 24, 2014
Answer: > 30.66 kJHeat change at constant volume for the decomposition of silver(I) oxide = 30.6...
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answered Feb 24, 2014
Toolbox:$\Delta G = \Delta H - T\Delta S$Answer: can be negative, but numerically smaller than $\fr...
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answered Feb 24, 2014
Answer: Both $\Delta H$ and $\Delta S$ are positiveDry ice $\Rightarrow CO_2$.This reaction is known...
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answered Feb 24, 2014
Toolbox:Melting of ice is spontaneous above 273 K at one atm pressure. Answer: neither negative nor ...
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answered Feb 24, 2014
Answer: perfectly crystalline solidsThe Third Law of Thermodynamics states, “The entropy of a perfec
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answered Feb 24, 2014
Answer: Stretching of rubber bandIn rubber the long flexible macromolecules coil up in a random way....
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answered Feb 24, 2014
Toolbox:When, $\Delta n_g = +ve, \Delta H > \Delta E$When, $\Delta n_g = -ve, \Delta H < \Delt...
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answered Feb 23, 2014
Answer: the net chemical change involve the combination of 1 mol of $H^+$ ions and ions $OH^-$ ions ...
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answered Feb 23, 2014
Answer: graphite is more stable than diamondSince graphite on combustion gives less heat, it means g...
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answered Feb 23, 2014
Answer: $\Delta E_{(combustion)} = - \frac{44Y}{X} J mol^{-1}$$CH_3CHO + \frac{5}{2} O_2 + \longrigh...
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answered Feb 23, 2014
Answer: ExothermicThe reaction involves decrease in randomness, therefore its spontaneity must be fa...
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answered Feb 23, 2014
Answer: $\Delta H$ is less than $\Delta E$ for combustion of carbon to carbonIn the formation of $C...
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answered Feb 23, 2014
Answer: -321.30 - 150 R$C_6H_5COOH (s) + \frac{15}{2} O_2(g) \longrightarrow 7CO_2(g) + 3H_2O(l)$Sin...
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answered Feb 23, 2014
Toolbox:During Isothermal expansion of an ideal gas $\Delta E=0, \Delta T=0$Answer: Enthalpy remains...
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answered Feb 23, 2014
Toolbox:Efficiency of a heat engine, $\eta = \frac{T_2 - T_1}{T_2}$Answer: temperature difference of...
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answered Feb 1, 2014
Toolbox:More the $K_{sp}$, for similar compounds more is the solubility. Answer: $Na_2S > ZnS >...
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answered Feb 1, 2014
Answer: $Al^{3+}$ Group reagent for group III ($NH_4Cl$ and $NH_4OH$) can precipitate group I,...
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answered Feb 1, 2014
Answer: $Fe^{3+}$ ions $4FeCl_3 + 3K_4[Fe(CN)_6] \longrightarrow Fe_4[Fe(CN)_6]_3 $ (Prussian...
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answered Feb 1, 2014
Answer: FeS $K_{sp} = 10^{-20}$ More the $K_{sp}$ more is the solubility as all sulphides are ...
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answered Feb 1, 2014
Answer: colourless $I_2 + Na_2S_2O_3$ (sodium thiosulphate) $ \longrightarrow Na_2S_4O_6 $ (sod...
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answered Feb 1, 2014
Answer: It is partially soluble in water $PbCl_2$ is partially soluble in water and dissolves c...
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answered Feb 1, 2014
Answer: filtration Suspended impurities can be removed from a colloidal solution by filtration...
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answered Feb 1, 2014
Answer: -56.1 KJ The magnitude of enthalpy of neutralsation of weak acid and strong base is alw...
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answered Feb 1, 2014
Toolbox:Enthalpy of neutralisation of strong acid and strong base is always constant. Answer: x&nbs...
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answered Feb 1, 2014
Answer: sodium cobaltinitrite $Na_3[Co(NO_2)_6] $ (sodium cobaltinitrite) $+ 3KCl \longrightar...
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answered Feb 1, 2014
Answer: HgS HgS is insoluble in dil. $HNO_3$ but soluble in aqua regia.$3HgS + 2HNO_3 + 6HCl \...
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answered Feb 1, 2014
Answer: zinc salt  On passing $H_2S$ through zinc salt solution in the presence of $NH_4OH$, a...
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answered Feb 1, 2014
Answer: dil HCl solution Both Pb and Hg form white ppt. of their chlorides. But $PbCl_2$ is sol...
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answered Feb 1, 2014
Answer: HCl decreases the concentration of $S^{2-}$ ions Due to common ion effect, HCl suppres...
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answered Feb 1, 2014
Answer: Convert ferrous ions to ferric ions To oxidise ferrous ion into ferric ion otherwise $...
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answered Feb 1, 2014
Answer: None of these The concentration of $CO^{2-}$ ions is very low which does not prevent th...
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answered Feb 1, 2014
Answer: $Cu^{2+}$ All except $Cu^{2+}$ are precipitated both with HCl and $H_2S$. $Cu^{2+}$ is...
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answered Feb 1, 2014
Toolbox:Since, $Na^+$ is more reactive than $Ba^{2+}$. So, $Ba^{2+}$ cannot displace $Cl^-$ from NaC...
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answered Feb 1, 2014
Answer: $BaCl_2$ $BaCl_2 + 2AgNO_3 \rightarrow 2AgCl \downarrow $ (white ppt.) $+ BaNO_3$$BaC...
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answered Feb 1, 2014
Answer: Urea $NaNO_2 + H_2SO_4 \longrightarrow Na_2SO_4 + 2HNO_2$$2HNO_2 + NH_2CONH_2 \xrightar...
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answered Feb 1, 2014
Answer: Dil $HNO_3$ Sodium carbonate extract is treated with Dil $HNO_3$ to destroy $CO_3^{2-}...
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answered Feb 1, 2014
Answer: $S^{2-}$ $Na[(CN)_5NO]$ (Sodium nitroprusside) $ + Na_2S \xrightarrow{\Delta} Na_4[(CN...
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answered Feb 1, 2014
Answer: $SO_4^{2-}$  White ppt. of $BaSO_4$ is insoluble in dil. $HCl$ and other mineral acids...
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answered Feb 1, 2014
Answer: $Al^{3+}$  The filter paper ash test is substitute for cobalt nitrate charcoal cavity ...
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answered Feb 1, 2014
Answer: $Pb(CH_3COO)_2$  $Pb(CH_3COO)_2 + H_2S \longrightarrow PbS + 2CH_3COOH$$SO_2$ has no e...
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answered Feb 1, 2014
Answer: $SO_2$ $K_2Cr_2O_7$ turns green by $SO_2$ due to its reduction.$K_2Cr_2O_7 + H_2SO_4 + 3SO_...
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