1
AIEEE 2007
+4
-1
The equivalent conductances of two strong electrolytes at infinite dilution in H2O (where ions move freely through a solution) at 25oC are given below:
$$\wedge _{C{H_3}COONa}^o$$ = 91.0 S cm2/equiv
$$\wedge _{HCl}^o$$ = 426.2 S cm2/equiv
What additional information/quantity one needs to calculate $$\wedge ^o$$ of an aqueous solution of acetic acid?
A
$$\wedge ^o$$ of chloroacetic acid (C/CH2COOH)
B
$$\wedge ^o$$ of NaCl
C
$$\wedge ^o$$ of CH3COOK
D
The limiting equivalent conductance of $${H^ + }( \wedge _{{H^ + }}^o)$$
2
AIEEE 2007
+4
-1
The cell, Zn | Zn2+ (1M) || Cu2+ (1M) | Cu($$E_{cell}^o$$ = 1.10V) was allowed to be completely discharged at 298 K. The relative concentration of Zn2+ to Cu2+ $$\left[ {{{\left[ {Z{n^{2 + }}} \right]} \over {\left[ {C{u^{2 + }}} \right]}}} \right]$$ is
A
antilog (24.08)
B
37.3
C
1037.3
D
9.65 $$\times$$ 104
3
AIEEE 2006
+4
-1
The molar conductivities $$\wedge _{NaOAc}^o$$ and $$\wedge _{HCl}^o$$ and at infinite dilution in water at 25oC are 91.0 and 426.2 Scm2/mol respectively. To calculate $$\wedge _{HOAc}^o$$ , the additional value required is
A
$$\wedge _{{H_2}O}^o$$
B
$$\wedge _{KCl}^o$$
C
$$\wedge _{NaOH}^o$$
D
$$\wedge _{NaCl}^o$$
4
AIEEE 2006
+4
-1
Resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.1 M is 100$$\Omega$$. The conductivity of this solution is 1.29 S m–1. Resistance of the same cell when filled with 0.2 M of the same solution is 520 $$\Omega$$, The molar conductivity of 0.02 M solution of the electrolyte will be
A
124 $$\times$$ 10–4 S m2 mol–1
B
1240 $$\times$$ 10–4 S m2 mol–1
C
1.24 $$\times$$ 10–4 S m2 mol–1
D
12.4 $$\times$$ 10–4 S m2 mol–1
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