300 gm, `30%`(w/w) NaOH solution is mixed with 500 gm `40%`(w/w) NaOH solution. What is `%` (w/v) NaOH if density of final solution is 2 gm/mL?
A. 72.5
B. 65
C. 62.5
D. None
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2.5 litre of `1M NaOH` solution is mixed with another 3 litre solution of `0.5M NaOH` solution. Then the molarity of the resulting solution is
Correct Answer - C `V_(1)M_(1) + V_(2)M_(2) = V_(3) xx M_(3)` `(2.5 xx 1 +3 xx 0.5) = M_(3) xx 5.5` `:. 2.5 +1.5 = M_(3) xx 5.5` or `M_(3) =...
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calcualate the amount of heat evolved when `500 cm^(3)` of 0.1M HCl is mixed with `200 cm^(3)` of 0.2 M NaOH.
Correct Answer - c `HCl+NaOHto NaCl+H_(2)O` at t=0, number of moles = `(500xx0.1)/1000 = (200xx0.2)/1000 ` =0.05 =0.04 during neutralisation of 1 mole of NaOH by 1 mole of HCl, heat...
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Calculate `DeltaG` for (i) `H_(2)O(l,2 atm , 300 K) to H_(2)O(g, 2 atm , 300 K ) ` (ii) `H_(2)O(l,P" "atm , 300 K) to H_(2)O(g, P" "atm , 300 K )` Cac
Correct Answer - (i) `DeltaG= V (P_(2)- P_(1)) + [DeltaH_(300) - 300 DeltaS_(300)]+ nRT ln .(P_(2))/(P_(1))` (ii) P = 26.28 atm
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What volume of aqueous solution of NaOH that is `80%` by mass NaOH, contanis 0.4 mol of NaOH. Density of solution is `0.8 gm//ml`.
Correct Answer - B `0.4 " mole " NaOH = 0.4 xx 40 = 16 gm` `80%` by mass NaOH `80 gm NaOH` in 100 gm solution 16 gm NaOH in...
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2.5 litre of 1M NaOH solution is mixed with a 3.0 litres of 0.5 M NaOH solution. The molarity of the resulting solution is :
Correct Answer - c `M_(1)V_(1)+M_(2)V_(2)=M_(3)(V_(1)+V_(2))` `M_(3)=(M_(1)V_(1)+M_(2)V_(2))/((V_(1)+V_(2)))` `M_(3)=(1xx2.5+0.5xx3)/(2.5+3)` `(4.0)/(5.5)=0.73M`
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25mL of 3.0 M HCI are mixed with 75 of 4.0 M HCI. If the volumes are volumes are aditive, the molarity of the final solution will be :
Correct Answer - b If the two solutions containing the same solute are mixed, the molarity of the resulting solution is given as : `M_(3)V_(3)=M_(1)V_(1)+M_(2)V_(2)` `M_(3)=(M_(1)V_(1)+M_(2)V_(2))/V_(3)=(M_(1)V_(1)+M_(2)V_(2))/((V_(1)+V_(2)))` `=((3.0M)xx(25mL)+(4.0M)xx(75mL))/((25+75)mL)` =3.75 M
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The vapour pressure of two miscible liquids A and B are 300 and 500 mm of Hg respectively.In a flask 2 moles of A are mixed with 6 moles of B.Further
Correct Answer - ABD `P_0=X_AP_A^@+X_BP_B^@=2/8xx300+6/8xx500`=450 mm of Hg Now, RLVP=`(P_0-P_S)/P_0=(450-420)/450=1/15` Also, RLVP =`(("in")/("in"+N))` `1/15=((32i)/70)/((32i)/70+8) :. i=1.25=(1+(2-1)alpha)`. So `alpha=0.25` (or 25 %) `:. n_(Cl^(-))` produced `=25/100xx32/70=4/35` `:. n_(PbCl_2)` precipitated =`1/2xx4/35=2/35`
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Equal masses of water and a liquid of density 2g/cm3 are mixed together. The density of mixture is:
Correct Answer - B If two liquid of equal masses and different densities are mixed together then density of mixture `rho=(2rho_(1)rho_(2))/(rho_(1)+rho_(2)) = (2xx1xx2)/(1+2) = (4)/(3)`
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`100 cm^(3)` of `0.5N HCI` solution at `299.95 K` was mixed with `100 cm^(3)` of ` 0.5 N NaOH` solution at `299.75 K` in a thermos flask. The final te
The initial average temperature of the acid and the `=(299.95+299.75)/(2)=299.85K` rise in temperature `=(302.65-299.65)=2.80K` Heat evolved during neutralisation `=(100+1000+44)xx4.184xx2.8=2858.5J` `therefore` Enthalpy of neutralisation `=-(2858.5)/(100)xx1000xx(1)/(0.50)` `=-57.17kJ`
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200ml of 11.35V `H_(2)O_(2)` solution is mixed with 300 ml of 22.7 V `H_(2)O_(2)` solution then which of the following is/are are correct for Resultin
Correct Answer - A::B Second ionisation energy of He(g) `=+54.4 V` Maximum lines `=(n(n-1))/(2)" "," Radius"=0.529 (n^(2))/(z)A^(@)" , Time period"prop(n^(3))/(z)`
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