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Which of the following represents the correct order of metallic character of the given elements?

For elements \( \mathrm{B}, \mathrm{C}, \mathrm{N}, \mathrm{Li}, \mathrm{Be}, \mathrm{O} \) and \( \mathrm{F} \), the correct order of first ionization enthalpy is:

Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R).
Assertion (A): \( \mathrm{Cu^{2+}} \) in water is more stable than \( \mathrm{Cu^{+}} \).
Reason (R): Enthalpy of hydration for \( \mathrm{Cu^{2+}} \) is much less than that of \( \mathrm{Cu^{+}} \).
In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: \( 5f \) electrons can participate in bonding to a far greater extent than \( 4f \) electrons
Reasons R : \( 5f \) orbitals are not as buried as \( 4f \) orbitals
In the light of the above statements, choose the correct answer from the options given below

The bond dissociation energy is highest for:

The difference between electron gain enthalpies will be maximum between?

Henry Moseley studied characteristic X-ray spectra of elements. The graph which represents his observation correctly is:
Given \( v \) = frequency of X-ray emitted
\( Z \) = atomic number

Boric acid is solid, whereas \( \mathrm{BF}_3 \) is gas at room temperature because of :

Given below are two statements:
Statement I: The decrease in first ionization enthalpy from B to Al is much larger than the from Al to Ga
Statement II: The d orbitals in Ga are completely filled
In the light of the above statement, choose the most appropriate answer from the options given below

Which of the following statements are not correct?
A. The electron gain enthalpy of \( \mathrm{F} \) is more negative than that of \( \mathrm{Cl} \)
B. Ionization enthalpy decreases in a group of periodic table
C. The electronegativity of an atom depends upon the atoms bonded to it.
D. \( \mathrm{Al_2O_2} \) and \( \mathrm{NO} \) are examples of amphoteric oxides
Choose the most appropriate answer from the options given below:

Lithium aluminium hydride can be prepared from the reaction of:

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The energy required to form \( \mathrm{Mg^{2+}} \) from \( \mathrm{Mg} \) is much higher than that required to produce \( \mathrm{Mg^{+}} \).
Reason R: \( \mathrm{Mg^{2+}} \) is small ion and carry more charge than \( \mathrm{Mg^{+}} \).
In the light of the above statements, choose the correct answer from the options given below:

The correct order of metallic character is equal to:

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Carbon forms two important oxides – $\text{CO}$ and $\text{CO}_2$. $\text{CO}$ is neutral whereas $\text{CO}_2$ is acidic in nature.

Reason R: $\text{CO}_2$ can combine with water in a limited way to form carbonic acid, while $\text{CO}$ is sparingly soluble in water.

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

Which one of the following sets of ions represented a collection of isoelectronic species? (Given: Atomic number: \( \mathrm{F: \, 9} \), \( \mathrm{Cl: \, 17} \), \( \mathrm{Na = 11} \), \( \mathrm{Mg = 12} \), \( \mathrm{Al = 13} \), \( \mathrm{K = 19} \), \( \mathrm{Ca = 20} \), \( \mathrm{Sc = 21} \).)

Inert gases have positive electron gain enthalpy. Its correct order is:

Match List-I with List-II.

Choose the correct answer from the options given below:

The correct order of electronegativity for given elements is:

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JEE Main 2023 30th Jan Evening Shift

Boric acid is solid, whereas \( \mathrm{BF}_3 \) is gas at room temperature because of :