Class 12th

For the galvanic cell.

$Zn\left(s\right)+C{u}^{2+}\left(0.02M\right)\to Z{n}^{2+}\left(0.04M\right)+Cu\left(s\right),$            

E_cell = ________* 10^-2V.          (Nearest integer)

$\left[Use:E_{Cu/C{u}^{2+}}^0=-0.34V,E_{Zn/Z{n}^{2+}}^0=+0.76V,\frac{2.303RT}{F}=0.059V\right]$

Excess of isobutene on reaction with Br₂ in presence of light at 125°C gives which one of the following, as the major product?

Which one of the following complexes is violet in colour?

The reaction rate for the reaction

${\left[PtC{l}_4\right]}^{2-}+H_{2}O\stackrel{}{?}{\left[Pt\left(H_{2}O\right)C{l}_3\right]}^{-}+C{l}^{-}$            

was measured as a function of concentrations of different species. It was observed that  

$\frac{-d{\left[\left[PtC{l}_4\right]\right]}^{2-}}{dt}=4.8*10^{-5}\left[{\left[PtC{l}_4\right]}^{2-}\right]-2.4*10^{-3}\left[{\left[Pt\left(H_{2}O\right)C{l}_3\right]}^{-}\right]\left[C{l}^{-}\right]$

where square bracket are used to denote molar concentrations. The equilibrium constant K_C = ________. (Nearest integer)

Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?

Given below are two statements:

Statement I : The limiting molar conductivity of KCl (strong electrolyte) is higher compared to that of CH₃COOH (weak electrolyte)

Statement II : Molar conductivity decreases with decrease in concentration of electrolyte.

In the light of the above statements, choose the most appropriate answer from the options given below:

In the sulphur estimation, 0.471 g of an organic compound gave 1.44g of barium sulphate The percentage of sulphur in the compound is________%. (Nearest integer)

(Atomic mass of Ba = 137u).

The correct sequential addition of reagents in the preparation of 3-nitrobenzoic acid from benzene is:

There are 6 refineries, 7 depots, 9 districts. The refineries are R1, R2, R3, R4, R5, R6. The depots are D1, D2, D3, D4, D5, D6 and D7 and the districts are DR1, DR2, DR3, DR4, DR5, DR6, DR7, DR8, DR9.

Table A shows the cost of transporting one unit from refinery to depot.

Table B shows the cost of transporting one unit from depot to districts.

The minimum cost of transportation of one unit from refinery BD to any district is

There are 6 refineries, 7 depots, 9 districts. The refineries are R1, R2, R3, R4, R5, R6. The depots are D1, D2, D3, D4, D5, D6 and D7 and the districts are DR1, DR2, DR3, DR4, DR5, DR6, DR7, DR8, DR9.

Table A shows the cost of transporting one unit from refinery to depot.

Table B shows the cost of transporting one unit from depot to districts.

The largest cost of sending one unit from any refinery to district is