21.

Salt of thiosulphruic acid is sodium thiosulphate which is used in

• Photography for fixing

• Submarines

• Space capsules

• Petroleum refining

The IUPAC name of the compound is:

• 1-ethyl-3, 3-dimethyl cyclochexane

• 3-ethyl-1, 1-dimethyl cyclohexane

• 3-ethyl-5-methyl heptane

• 5-sec-Butyl-4 isopropydecane

The reduction of 4-octyne with H₂ in the presence of Pd/CaSo₄ quinoline gives:

• trans-4-octene

• cis-4-octene

• a mixture of cis and trans-4-octene

• a completely reduced product C₈H₁₈

The number of chiral carbons atoms present in the molecule is:

• 3

• 4

• 2

• 1

EMF or hydrogen electrode in terms of pH at 1 atm pressure is

• E_{H2 = $\frac{\mathrm{RT}}{\mathrm{F}}\mathrm{pH}$}

• E_{H2 = $\frac{\mathrm{RT}}{\mathrm{F}}\frac{1}{\mathrm{pH}}$}

• E_{H2 = $\frac{2.303 \mathrm{RT}}{\mathrm{F}}\mathrm{pH}$}

• E_{H2 = -0.0591 pH}

The increase in rate of reaction is four times when the concentration of reactant is increased two times.The order of reaction is:

• Zero.

• First.

• Second.

• Third.

T-shaped inter halogen compound is:

• ClF₃

• ICl

• ClF₅

• IF₅

A metallic element has a cubic lattice with edge length of unit cell of 2Å and density is 2.5g cm^-1. The number of unit cells in 200g of metal are :

• 1$\times$ 10²⁴

• 1 $\times$ 10²⁰

• 1 $\times$ 10²⁵

• 1 $\times$ 10²²

Assuming that constant current is delivered. How many kW-h of electricity can be produced by the reaction of 1.0 mole Zn with Cu ion in a Daniel cell in which all the concentration remains 1.00 M.

(Given E$\mathrm{Given} \mathrm{E}{°}_{\mathrm{Zn}/{\mathrm{Zn}}^{+}=0.76}$=0.76V),

• 0.069 kW-h

• 0.074 kW-h

• 0.080 kW-h

• 0.059 kW-h

Which of the following complex will exhibit facial and meridional isomerism?

• $\left[\mathrm{Co}\left({\mathrm{NH}}_3\right){\mathrm{Cl}}_3\right]$

• $\left[\mathrm{Co}\left({\mathrm{NH}}_3\right){\mathrm{Cl}}_2\right]\mathrm{Cl}$

• $\left[\mathrm{Co}{\left(\mathrm{en}\right)}_3\right]{\mathrm{Cl}}_3$

• ${\mathrm{K}}_3\left[\mathrm{Co}{\left(\mathrm{CN}\right)}_4{\mathrm{Cl}}_2\right]$