Free s-Block and p-Block Elements MCQs with Answers
1,359 s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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1,359 questions · page 62 of 68
- 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.
Correct answer: Li, Na- 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.
Correct answer: De-excitation of electrons from higher energy levels to lower energy levels- 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…
Correct answer: Low charge density- 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.
Correct answer: Fused NaCl- A. NaNO3
- B. CaC03
- C. Ba(NO3)2
- D. NH4CI
Explanation: Option A is correct. Not Option C because Barium Nitrate is called Nitrobarite.
Correct answer: NaNO3- 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.
Correct answer: Aqueous sodium hydroxide- 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.
Correct answer: Oscillation of loose electrons- 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.
Correct answer: Mg- A. (NH4)2Cr2O7
- B. K2Cr2O7
- C. Zn(ClO3)2-
- D. KClO3
Explanation: Oxygen is not released on heating compound (NH4)2 Cr2 O7.
Correct answer: (NH4)2Cr2O7- 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.
Correct answer: NaNO3- A. Li
- B. Fr
- C. Cs
- D. K
Explanation: Answer: ALithium is the only alkali metal that reacts with nitrogen to form lithium nitride.
Correct answer: Li- 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…
Correct answer: Graphite- A. MgO and NO2
- B. Mg and NO2
- C. MgO, NO2, O2
- D. Mg(NO3)2
Explanation: The thermal decomposition of nitrates of group 2 produces metal oxide, nitrogen dioxide and oxygen.
Correct answer: MgO, NO2, O2- A. CO2
- B. Magnesium and Copper
- C. N2O
- D. N2 as well as CO2
Explanation: When burning magnesium is placed in carbon dioxide it keeps burning with a bright flame.
Correct answer: CO2- A. All nitrates of Group II metals are decomposed by heat to give the oxide NO2
- B. Aqueous sodium nitrate in acidic to litmus
- C. Aqueous ammonium nitrate is alkaline to litmus
- D. The alkali metal nitrates are insoluble in water
- E. Metals dissolve in concentrated nitric acid to give hydrogen
Explanation: All group II and group I metals decompose to produce NO2 as the gas, so statement A stands correct.
Correct answer: All nitrates of Group II metals are decomposed by heat to give the oxide NO2- A. The magnitude of the enthalpy change of hydration of the metal ion
- B. The pH of the aqueous chloride
- C. The solubility of the sulphate in water
- D. The stability of the carbonate to heat
- E. The tendency to form complex ions
Explanation: The stability of metal carbonates increases down the group, so D is the correct option.
Correct answer: The stability of the carbonate to heat- A. NH3
- B. H2
- C. N2
- D. NO
Explanation: When alkaline earth metal nitride reacts with water, ammonia (NH3) is produced.
Correct answer: NH3- A. Decreases down the group
- B. Increases down the group
- C. Remains constant throughout the group
- D. First increases then decreases down the group
Explanation: The solubility of the carbonates and the sulfates decreases rapidly down the group because hydration energies decrease with increasing…
Correct answer: Increases down the group- A. Gypsum
- B. Dolomite
- C. Calcite
- D. Plaster of Paris
Explanation: Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4.2H2O. Thus, option A is correct.
Correct answer: Gypsum- A. Hg
- B. Pb
- C. Fe
- D. As
Explanation: Lead poisoning is an unusual and frequently overlooked medical complication of gunshot wounds with retained bullet fragments.
Correct answer: Pb