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General Chemistry II-Lecture,Section-1-Spring 2025

General Chemistry II-Lecture,Section-1-Spring 2025

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In contrast to NH₃

the rest of the Group 15, MH

₃

compounds, show relatively poor Lewis

base character. Why is this?

The hydrides are ionic.

For the rest of the Group

15 hydrides, the lone pair is not

readily available for bonding.

The centers are sterically hindered due to short bond lengths and it is difficult to coordinate to the lone pair.

There are fewer valence

electrons available.

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Why does H⁺ion always get associated with other atoms or molecules?

It resembles both alkali metals and halogens

Its reactivity is similar to halogens.

Ionization enthalpy of hydrogen resembles that of alkali metals.

Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions.

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Which isotope of hydrogen is radioactive?

tritium

deuterium

protium

hydrogen

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The Periodic Table of the

elements forms four different types of hydride.

Match the type of hydride with the appropriate compound.

B₂H₆

AsH₃

CH₄

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Match the enthalpy of

formation with the appropriate Group 17 hydrogen halide

–92.3 kJ mol^–1

+26.5 kJ mol^–1

–271.1 kJ mol^–1

–36.4 kJ mol^–1

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Which of the following is the correct order of increasing ionic character?

LiH < NaH < KH < RbH < CsH

LiH > NaH > CsH > KH > RbH

LiH > NaH > KH > RbH > CsH

LiH < NaH < CsH < KH < RbH

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What is the oxidation state

of the oxygen in

H₂O₂?

-1

50%

-2

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Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is most important in this respect?

Hydrogen and halogen only resembles in its first letter

Its tendency to lose an electron to form a cation

Its tendency to gain a single electron in its valence shell to attain stable electronic configuration

Its low negative enthalpy value

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Which of the following statements does not describe the properties of water? Check all those that apply.

Hydrogen bonding is present to a large extent in liquid water.

Frozen water is heavier than liquid water

Water is known to be a universal solvent

There is no hydrogen bonding in the frozen state of water

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Calculate Z_eff for the outermost electron of He.