Which statement is false for the periodic classification of elements?

Important Questions on Periodic Properties and Variations of Properties – Physical and Chemical

EASY

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Identify the correct statement from the following.

EASY

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Identify the element that forms amphoteric oxide:

EASY

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Which of the following pairs exhibit a diagonal relationship?

MEDIUM

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The first ionization energy of magnesium is smaller, as compared to that of elements $\mathrm{X}$ and $\mathrm{Y}$, but higher than that of $\mathrm{Z}$. The elements $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$, respectively, are :

MEDIUM

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The acidic, basic and amphoteric oxides, respectively, are

MEDIUM

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Which of the following has highest hydration energy?

EASY

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Which among the following oxides is the most basic?

MEDIUM

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The general formula of the compounds formed when group $13$ elements (A) reacts with group $16$ elements (B) is

EASY

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In general, the property (magnitudes only) that shows an opposite trend in comparison to other properties across a period is :

MEDIUM

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Three elements $\mathrm{X},\mathrm{Y}$ and $\mathrm{Z}$ are in the $3^{\text{rd }}$period of the periodic table. The oxides of$\mathrm{X},\mathrm{Y}$ and $\mathrm{Z}$, respectively, are basic, amphoteric and acidic. The correct order of the atomic numbers of $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$ is:

EASY

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The set of elements that differ in mutual relationship from those of the other sets is:

MEDIUM

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In the following sets of reactants which two sets best exhibit the amphoteric character of Al₂O₃ . xH₂O ?

$\begin{array}{cc}\text{Set I}& {\text{Al}}_2{\text{O}}_3·{\text{xH}}_2{\text{O}}_{\left(\text{s}\right)}+{\text{OH}}_{\left(\text{aq}\right)}^{-}\\ \text{Set II}& {\text{Al}}_2{\text{O}}_3\text{x}·{\text{H}}_2{\text{O}}_{\left(\text{s}\right)}+{\text{H}}_2{\text{O}}_{\left(\mathit{\text{l}}\right)}\\ \text{Set III}& {\text{Al}}_2{\text{O}}_3\text{x}·{\text{H}}_2{\text{O}}_{\left(\text{s}\right)}+{\text{H}}_{\left(\text{aq}\right)}^{+}\\ \text{Set IV}& {\text{Al}}_2{\text{O}}_3·{\text{xH}}_2{\text{O}}_{\left(\text{s}\right)}+{\text{NH}}_{3\left(\text{aq}\right)}\end{array}$

EASY

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The characteristics of elements $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$ with atomic numbers, respectively, $33, 53$ and $83$ are:

EASY

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$\mathrm{Be}$ and $\mathrm{Al}$ show similarities in properties due to the diagonal relationship except in the property $\mathrm{X}$ given below. What is $\mathrm{X}$?

EASY

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How many of the following statements is/are correct?
a) Mercury is the only metal that exists as liquid at room temperature.
b) Among non-metals, carbon has the highest melting point.
c) Hydrogen is the most abundant element in the universe.
d) Oxygen is the most abundant element in the earth's crust.

MEDIUM

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Which among the following structures does not correctly represent the bonding capacities (valancies) of the atoms involved ?

MEDIUM

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The neutral oxide among the following is

EASY

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Match the following :

Oxide	Nature
(a) $\mathrm{CO}$	(i) Basic
(b) $\mathrm{BaO}$	(ii) Neutral
(c) ${\mathrm{Al}}_2{\mathrm{O}}_3$	(iii) Acidic
(d) ${\mathrm{Cl}}_2{\mathrm{O}}_7$	(iv) Amphoteric

Which of the following is correct option?

HARD

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$\mathrm{B}$ has a smaller first ionization enthalpy than $\mathrm{B}\mathrm{e}$. Consider the following statement:
(I) it is easier to remove $2\mathrm{p}$ electron than$2\mathrm{s}$  electron
(II) $2\mathrm{p}$ electron of $\mathrm{B}$ is more shielded from the nucleus by the inner core of electrons than the $2\mathrm{s}$ electrons of $\mathrm{B}\mathrm{e}$
(III) $2\mathrm{s}$ electron has more penetration power than $2\mathrm{p}$ electron
(IV) atomic radius of $\mathrm{B}$ is more than $\mathrm{B}\mathrm{e}$
(atomic number $\mathrm{B}:5, \mathrm{B}\mathrm{e}=4$ )
The correct statements are.

HARD

Science>Chemistry>Periodic Properties and Variations of Properties – Physical and Chemical>Periodicity

Among the following, the correct order of acidity is: