Which of the following statements about the ICI_3 molecule is correct? a. The mo

Question

Which of the following statements about the ICI_3 molecule is correct? a. The molecule has trigonal planar molecular geometry and sp^2 hybridization around the central atom. b. The molecule has trigonal bipyramidal molecular geometry and dsp^3 hybridization around the centeral atom. C. The molecule has T-shaped molecular geometry and dsp^3 hybridization around the central atom. 21) When a sample of ammonium nitrate dissolves in 50 grams of water, the temperature of the solution changes changes from 24 degree C to 16 degree C. For the process the deltaH is and energy is transferred the system the surrounding a. Positive, form, to b. Positive, to, from c. Negative, to, from d. Negative, from, to Fulvence is an organic molecule with the molecular formula C_6H_6. What is the percent carbon in fulvene? a. 92.3 % b. 50.0 % c. 15.0% d. 7.71 %

Explanation / Answer

20)

I in ICl3 is in sp3d hybridization state having 3 bond pairs and 2 lone pairs.

Its has T shaped structure as,

Hence the correct statement is (d) The molecule has T-shaped molecular geometry and dsp3 (sp3d) hybridization around the central atom.

Answer – Option-(d)

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21)

As temperature of water decreases on addition of ammonium nitrate it’s clear that heat energy is transferred from water to electrolyte ammonium nitrate for ionization i.e. It’s an endothermic reaction. Conventionally a system of reactants that absorbs heat from the surroundings in an endothermic reaction has a positive H, because the enthalpy of the products is higher than the enthalpy of the reactants of the system.

Hence we have the complete statement as,

When a sample of ammoinium nitrate dissolves in 50 g of water , the temperature of the solution changes from 24 oC to 16 oC. For the process the H is positive and energy (heat energy) is transferred to the system (ammonium nitrate) from the surroundings (water).

Answer-option-(b).

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22)

Fulvene has molecular formula C6H6.

Let us calculate its molar mass first.

Atomic mass of C = 12 g

Mass of C in C6H6 = 6 x 12 = 72g

Atomic mass of H = 1 g

Mass of H = 1 x 6 = 6 g

Hence, Molar mass of fulvene (C6H6) = 12 x 6 + 1 x 6 = 78 g.

Then,

% mass of C = (Mass of C/Molar mass of C6H6) x 100

% mass of C = (72/78) x 100

% mass of C = 92.3%

Answer-Option-(a)

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