Chemistry NCERT Exemplar Solutions Class 12th Chapter Five

Production of iron in blast furnace follows the following equation

$F{e}_3{O}_4\left(s\right)+4CO\left(g\right)\to 3Fe\left(I\right)+4C{O}_2\left(g\right)$

When 4.640 kg of Fe₃O₄ and 2.520 kg of CO are allowed to react then the amount of iron (in g) produced is:

[Given : Molar Atomic mass (g mo^-1); Fe = 56

 Molar Atomic mass (g mol^-1); O = 16

Molar Atomic mass (g mol^-1); C = 12]

 $C_6{H}_{12}{O}_6\stackrel{Zymase}{\to }$ A $\underset{\Delta }{\overset{NaOl}{\to }}B+CH{l}_3$

The number of carbon atoms present in the product B is______________.

Observe structure of the following compounds

The total number of structures / compounds which possess asymmetric atoms is________.

Kjeldahl's method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from 0.55g of the compound neutralized 12.5 mL of 1M H₂SO₄ solution. The percentage of nitrogen in the compound is_________ (Nearest Integer)

An acidified magnate solution undergoes disproportionation reaction. The spin- only magnetic moment value of the product having manganese in higher oxidation state is________ B.M. (Nearest Integer)

The number of terminal oxygen atoms present in the product B obtained from the following reaction is_____________.

$FeC{r}_2{O}_4+N{a}_{2}C{O}_3+O_2\to A+F{e}_2{O}_3+C{O}_2$

$A+H^{+}\to B+H_{2}O+N{a}^{+}$

The activation energy of one of the reactions is a biochemical process is 532611 J mol^-1 when the temperature falls from 310 K to 300 K, the change in rate constant observed is k₃₀₀ = x * 10^-3 k₃₁₀. The value of x is___________.

[Given: In 10 = 2.3 R = 8.3 JK^-1 mol^-1]

A dilute solution of sulphuric acid is electrolyzed using a current of 0.10 A for 2 hours to produce hydrogen and oxygen gas. The total volume of gases produced at STP is __________ cm³. (Nearest Integer).

[Given: Faraday constant F = 96500 C mol^-1 at STP, molar volume of an ideal gas is 22.7 L mol^-1]

1.2 mL of acetic acid is dissolved in water to make 2.0L of solution. The depression in freezing point observed for this strength of acid is 0.0198°C. The percentage of dissociation of the acid is_____________. (Nearest Integer).

[Given Density of acetic acid is 1.02g mL^-1

Molar mass of acetic acid is 60g mol^-1]

17.0g of NH₃ completely vapourises at -33.42°C and 1 bar pressure and the enthalpy change the process is 23.4 kJ mol^-1. The enthalpy change for the vapourisation of 85g of NH₃ under the same conditions is_____ kJ.