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11.

The conductance  of a 0.0015 M aqueous solution of a weak monobasic acid was determined by using a conductivity cell consisting of platinised pt electrodes.  The distance between the electrodes  is 120 cm with an area of cross section of 1 cm2. The conductance of this solution was found to be 5× 10-7 S. The pH of the solution is 4. The value of limiting molar conductivity ( $\wedge^{0}_{m}$) of this weak monobasic acid in aqueous solution is Z× 102 S cm-1 mol-1. The value of Z is


A) 600

B) 800

C) 500

D) 400



12.

A crystalline solid of a pure substance has a face-centered cubic structure with a cell edge of 400 pm. If the density of the substance in the crystal is 8 g cm-3 , then the number of atoms present in 256 g of the crystal is N × 1024.  The value  of N is 


A) $2\times 10^{26}$

B) $4\times 10^{26}$

C) $2\times 10^{24}$

D) $4\times 10^{26}$



13.

The color of the X2 molecules of group 17 elements changes gradually from yellow to violet down the group. This is due to


A) decrease in $\pi^{*}-\sigma^{*}$ gap down the group

B) decrease in ionisation energy down the group

C) the physical state of $X_{2}$ at room temperature changes from gas to solid down the group

D) decreases in HOMO-LUMO gap down the group



14.

The correct statment(s) about the oxoacids, HClO4 and HClO, is(are)


A) The central atom in both $HClO_{4}$ AND HClO is $sp^{3}$ hybridised

B) $HClO_{4}$ is formed in the reaction between $Cl_{2}and H_{2}O$

C) The conjugate base of $HClO_{4}$ is weaker base than $ H_{2}O$

D) $HClO_{4}$ is more acidic than HClO because of the resonance stabilisation of its anion



15.

An ideal gas is expanded form (p1, V1, T1) to ( p2, V2, T2) under different conditions. The correct statement(s) among the following is (are)


A) The work done by the gas is less when it is expanded reversibly from $V_{1}$ to $V_{2}$  under adiabatic conditions as compared to that when expanded reversibly from  $V_{1}$ to $V_{2}$ under isothermal conditions

B) The change in internal energy of the gas is (i) zero, if it is expanded reversibly with $T_{1}$=$T_{2}$ . and (ii) positive,  if it is expanded reversibly under adiabatic conditions with $T_{1}$ $\neq$ $T_{2}$

C) If the expansion carried out freely, it is simultaneous both isothermal as well as adiabatic.

D) The work done on the gas is maximum when it is compressed irreversibly from ($P_{2},V_{2}$) to ($P_{1},V_{1}$ ) against constant pressure $P_{1}$



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