Free Reactions of Group I Elements MCQs with Answers

• A. Their oxides are basic
• B. Their oxides and hydroxides are water-soluble and form alkaline solutions in water
• C. Both a & b
• D. They are found in the earth

Explanation: Option A: Their oxides are basic: This option refers to the fact that alkali metals form oxides that have basic properties.

• A. Nelson's Cell
• B. Hg- Cell
• C. Castner Kellner Cell
• D. All of these

Explanation: Option A: Nelson's Cell, also called the Mercury Cell or Castner-Kellner Cell, is one type of electrolytic cell used for the production of…

• A. NaNO3
• B. CaCO3
• C. Ba(NO3)2
• D. NH4CI

Explanation: One of the common minerals of sodium metal is Chile saltpeter. The formula for it is NaNO3.

• A. Na, K
• B. Mg, Ca
• C. Li, Na
• D. Li, Ca

Explanation: The metal oxides formed from the thermal decomposition of sodium nitrate and lithium nitrate are different.

• A. Smaller electronegativity of alkali metals
• B. The smaller ionic radius of these metals
• C. De-excitation of electrons from higher energy levels to lower energy levels
• D. Excitation of electrons from low energy levels to higher energy levels

Explanation: Alkali metals have low ionization energies. The energy from the flame is sufficient to excite electrons to a higher energy level.

• A. Low electronegativity
• B. Low electropositivity
• C. Low charge density
• D. Not known yet

Explanation: Carbonates of sodium are more stable compared to carbonates of lithium due to low charge density.Low charge density: Charge density refers…

• A. Aqueous NaCl
• B. Aqueous NaNO3
• C. Fused NaCl
• D. Fused NaN03

Explanation: Down's cell is used for the electrolysis of fused NaCl to obtain highly reactive sodium metal.

• A. NaNO3
• B. CaC03
• C. Ba(NO3)2
• D. NH4CI

Explanation: Option A is correct. Not Option C because Barium Nitrate is called Nitrobarite.

• A. Water
• B. NaCl
• C. Aqueous sodium hydroxide
• D. H2S04

Explanation: Ammonium chloride which is a salt in nature will react with base sodium hydroxide to form ammonia gas, water and sodium chloride.

• A. Diffusion of Na+
• B. Oscillation of loose electrons
• C. Excitation of free protons
• D. Strong crystal lattice

Explanation: Option B is correct since the luster of sodium metal is due to the oscillation of the loose electron of sodium metal.

• A. Na
• B. K
• C. Cs
• D. Mg

Explanation: Magnesium belongs to group 2A which are the alkaline earth metals; the rest of the elements above are alkali metals.

• A. (NH4)2Cr2O7
• B. K2Cr2O7
• C. Zn(ClO3)2-
• D. KClO3

Explanation: Oxygen is not released on heating compound (NH4)2 Cr2 O7.

• A. NaNO3
• B. CaCO3
• C. Ba(NO3)2
• D. NH4Cl

Explanation: The formula for Chile Saltpeter is NaNO3. It is also known as Sodium nitrate.

• A. Li
• B. Fr
• C. Cs
• D. K

Explanation: Answer: ALithium is the only alkali metal that reacts with nitrogen to form lithium nitride.

• A. Graphite
• B. Copper
• C. Iron
• D. Silver

Explanation: In a Down cell, the anode is made up of graphite. It is made up of graphite so that it does not react with chlorine which is liberated at…

• A. Li
• B. Be
• C. Na
• D. K

Explanation: Lithium is harder than other alkali metals. The melting and boiling point is higher than other alkali metals.

• A. H+
• B. H2−2
• C. H
• D. H−

Explanation: Explanation:The correct answer is H+ because when hydrogen loses an electron, it becomes a positively charged ion called a hydrogen ion or…

• A. Rubidium
• B. Potassium
• C. Sodium
• D. Lithium

Explanation: Explanation:Lithium carbide is the only alkali metal carbide formed via direct reaction.

• A. Li2CO3
• B. Mg2CO3
• C. K2CO3
• D. Na2CO3

Explanation: A is correct as Lithium carbonate is not stable to heat. Hence, it decomposes at a lower temperature.B is incorrect as Mg2CO3 is stable…

• A. Chloride ions
• B. Sulfate ions
• C. Phosphate ions
• D. Cr3+ ions

Explanation: The chromyl chloride test is used to detect chloride ions in the qualitative analysis.