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Multiple choice chemistry the periodic table periodic trends in chemical properties alkali metals study of specific groups

All the naturally occurring noble gases are non-reactive except:

  1. Argon

  2. Helium

  3. Xenon

  4. Radon
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

While noble gases are generally inert, Xenon is the most reactive among them due to its lower ionization energy, allowing it to form compounds with highly electronegative elements like fluorine and oxygen. Argon, Helium, and Radon are significantly less reactive under standard conditions.

Multiple choice chemistry the periodic table periodic trends in chemical properties alkali metals study of specific groups

Choose the correct answer:

As per the octet rule, noble gases are stable in nature. This is due to the presence of________ electrons in their outermost shell.

  1. 8

  2. 18

  3. 6

  4. 2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As per octet rule, noble gases have 8 electrons in their outermost shell. According to octet rule the element which has 8 electron in its valence shell are stable.

Multiple choice chemistry patterns and properties of metals periodic trends in chemical properties alkali metals study of specific groups

X, Y and Z are elements in Period $3$ of the Periodic Table. The results of some experiments carried out with compounds of these elements are shown.


Element Result of adding the oxide of the element to $H _2O(l)$ Result of adding the chloride of the element of $H _2O(l)$ Result of adding the oxide of the element to $HCl(aq)$
X No reaction Hydrolyses Forms chloride salt
Y Forms hydroxide Dissolves Forms chloride salt
Z Forms acid Hydrolyses Hydrolyses


Which statement could be correct?

  1. X is Al and Y is Mg

  2. X is Si and Y is Na

  3. Y is Al and Z is P

  4. Y is Na and Z is Al
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Based on the table, Y forms a hydroxide with water (characteristic of Na or Mg), X hydrolyses (characteristic of Al or Si), and Z forms an acid (characteristic of P or S). Matching these properties, Y=Na (forms NaOH), X=Si (SiCl4 hydrolyses), and Z=P (P4O10 forms phosphoric acid) fits the data.

Multiple choice chemistry patterns and properties of metals periodic trends in chemical properties alkali metals study of specific groups
Metal which is soft and floats on water is _______ .

  1. aluminium

  2. copper

  3. lead

  4. potassium

  5. iron

  6. lithium
Reveal answer Fill a bubble to check yourself
F Correct answer
Explanation

Lithium is lightest elemental metal nearly half as dense as water, so it floats on the surface and ultimately disappears, giving off hydrogen gas and forming a colourless solution of lithium hydroxide.


Hence, the correct option is $\text{F}$

Multiple choice chemistry patterns and properties of metals periodic trends in chemical properties alkali metals study of specific groups

Sodium reacts with water more vigorously than lithium because it :

  1. has higher atomic weight.

  2. is a metal.

  3. is more electropositive.

  4. more electronegative.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sodium reacts with water more vigorously than lithium its more electropositive and will give electrons easily.
Hence option C is correct.

Multiple choice chemistry patterns and properties of metals periodic trends in chemical properties alkali metals study of specific groups

Which of the following does not react with water?

  1. Sodium ions

  2. Sodium atoms

  3. Potassium ions
  4. Both $A$ and $C$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sodium ions and potassium ions do not react with water.
The main reason is that have already lost that electron and are therefore much more stable. They don't tend to lose another electron, and they certainly don't try to get that lost electron back, so there's no tendency for them to react.