Q. What is the chemical formula for the compound formed between strontium and chlorine? (2019)
-
A.
SrCl
-
B.
SrCl2
-
C.
Sr2Cl
-
D.
Sr2Cl3
Solution
Strontium forms a compound with chlorine as SrCl2, where strontium has a +2 charge and chlorine has a -1 charge.
Correct Answer: B — SrCl2
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Q. What is the color of the flame produced by burning strontium salts? (2023)
-
A.
Red
-
B.
Green
-
C.
Blue
-
D.
Yellow
Solution
Strontium salts produce a red flame when burned.
Correct Answer: A — Red
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Q. What is the color of the flame produced by lithium salts? (2019)
-
A.
Red
-
B.
Green
-
C.
Blue
-
D.
Yellow
Solution
Lithium salts produce a red flame when burned.
Correct Answer: A — Red
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Q. What is the common oxidation state of alkaline earth metals? (2019)
Solution
Alkaline earth metals typically exhibit a common oxidation state of +2.
Correct Answer: B — +2
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Q. What is the common oxidation state of aluminum in its compounds? (2020)
Solution
Aluminum commonly exhibits an oxidation state of +3 in its compounds.
Correct Answer: C — +3
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Q. What is the common oxidation state of iron in Fe2O3? (2019)
Solution
In Fe2O3, iron has a common oxidation state of +3.
Correct Answer: C — +3
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Q. What is the general electronic configuration of alkali metals? (2022)
-
A.
ns^1
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B.
ns^2
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C.
ns^2np^1
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D.
ns^2np^2
Solution
The general electronic configuration of alkali metals is ns^1, where n is the principal quantum number.
Correct Answer: A — ns^1
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Q. What is the primary characteristic of alkaline earth metals? (2020)
-
A.
They are highly reactive
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B.
They have a +2 oxidation state
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C.
They are gases at room temperature
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D.
They form covalent bonds
Solution
Alkaline earth metals typically have a +2 oxidation state due to the loss of two electrons.
Correct Answer: B — They have a +2 oxidation state
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Q. What is the primary product of the thermal decomposition of calcium carbonate? (2019)
-
A.
Calcium oxide
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B.
Calcium hydroxide
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C.
Calcium bicarbonate
-
D.
Calcium chloride
Solution
The thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2).
Correct Answer: A — Calcium oxide
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Q. What is the primary product when lithium reacts with nitrogen? (2022)
-
A.
Lithium nitride
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B.
Lithium oxide
-
C.
Lithium hydroxide
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D.
Lithium carbonate
Solution
Lithium reacts with nitrogen to form lithium nitride (Li3N).
Correct Answer: A — Lithium nitride
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Q. What is the primary use of calcium carbonate? (2019)
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A.
As a fertilizer
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B.
In the production of glass
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C.
As a building material
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D.
In antacids
Solution
Calcium carbonate is commonly used in antacids to neutralize stomach acid.
Correct Answer: D — In antacids
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Q. What is the primary use of lithium in batteries? (2023)
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A.
As a conductor
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B.
As a cathode material
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C.
As an anode material
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D.
As an electrolyte
Solution
Lithium is primarily used as an anode material in lithium-ion batteries due to its high electrochemical potential.
Correct Answer: C — As an anode material
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Q. What is the primary use of magnesium in industries? (2021)
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A.
Construction
-
B.
Aerospace
-
C.
Electronics
-
D.
Pharmaceuticals
Solution
Magnesium is primarily used in the aerospace industry due to its lightweight and strength.
Correct Answer: B — Aerospace
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Q. What is the primary use of magnesium in industry? (2023)
-
A.
Construction
-
B.
Aerospace
-
C.
Electronics
-
D.
Pharmaceuticals
Solution
Magnesium is primarily used in construction and aerospace industries due to its lightweight and strength.
Correct Answer: B — Aerospace
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Q. What is the trend in atomic radius as you move down the alkali metal group? (2022)
-
A.
Increases
-
B.
Decreases
-
C.
Remains constant
-
D.
Increases then decreases
Solution
The atomic radius increases as you move down the alkali metal group due to the addition of electron shells.
Correct Answer: A — Increases
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Q. What is the trend in reactivity of alkali metals down the group? (2022)
-
A.
Increases
-
B.
Decreases
-
C.
Remains constant
-
D.
Varies irregularly
Solution
The reactivity of alkali metals increases down the group due to the decrease in ionization energy.
Correct Answer: A — Increases
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Q. Which alkali metal is known for its vigorous reaction with water? (2022)
-
A.
Lithium
-
B.
Sodium
-
C.
Potassium
-
D.
Rubidium
Solution
Potassium (K) reacts vigorously with water, producing potassium hydroxide and hydrogen gas.
Correct Answer: C — Potassium
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Q. Which alkaline earth metal has the highest melting point? (2022)
-
A.
Beryllium
-
B.
Magnesium
-
C.
Calcium
-
D.
Barium
Solution
Beryllium has the highest melting point among the alkaline earth metals.
Correct Answer: A — Beryllium
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Q. Which alkaline earth metal is known for its use in the production of lightweight alloys? (2023)
-
A.
Calcium
-
B.
Barium
-
C.
Magnesium
-
D.
Strontium
Solution
Magnesium is widely used in the production of lightweight alloys due to its low density.
Correct Answer: C — Magnesium
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Q. Which alkaline earth metal is used in fireworks for its bright flame? (2021)
-
A.
Barium
-
B.
Calcium
-
C.
Strontium
-
D.
Magnesium
Solution
Strontium (Sr) is used in fireworks to produce a bright red flame.
Correct Answer: C — Strontium
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Q. Which alkaline earth metal is used in fireworks for producing a bright white light? (2023)
-
A.
Barium
-
B.
Calcium
-
C.
Strontium
-
D.
Magnesium
Solution
Strontium is used in fireworks to produce a bright red flame.
Correct Answer: C — Strontium
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Q. Which of the following alkali metals is most reactive with water? (2023)
-
A.
Lithium
-
B.
Sodium
-
C.
Potassium
-
D.
Rubidium
Solution
Potassium (K) is more reactive with water than Sodium (Na) and Lithium (Li).
Correct Answer: C — Potassium
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Q. Which of the following alkaline earth metals has the highest melting point? (2019)
-
A.
Beryllium
-
B.
Magnesium
-
C.
Calcium
-
D.
Strontium
Solution
Beryllium has the highest melting point among the alkaline earth metals.
Correct Answer: A — Beryllium
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Q. Which of the following alkaline earth metals is most reactive? (2020)
-
A.
Beryllium
-
B.
Calcium
-
C.
Strontium
-
D.
Barium
Solution
Barium is the most reactive alkaline earth metal due to its larger atomic size and lower ionization energy.
Correct Answer: D — Barium
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Q. Which of the following alkaline earth metals is the least reactive? (2022)
-
A.
Barium
-
B.
Calcium
-
C.
Magnesium
-
D.
Strontium
Solution
Magnesium (Mg) is the least reactive among the alkaline earth metals due to its higher ionization energy compared to the others.
Correct Answer: C — Magnesium
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Q. Which of the following alkaline earth metals reacts vigorously with water? (2019)
-
A.
Beryllium
-
B.
Calcium
-
C.
Magnesium
-
D.
Strontium
Solution
Calcium reacts vigorously with water to form calcium hydroxide and hydrogen gas.
Correct Answer: B — Calcium
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Q. Which of the following compounds is a common oxidizing agent? (2019)
-
A.
HCl
-
B.
KMnO4
-
C.
NaCl
-
D.
CaO
Solution
Potassium permanganate (KMnO4) is a well-known oxidizing agent used in various chemical reactions.
Correct Answer: B — KMnO4
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Q. Which of the following compounds is an amphoteric oxide? (2022)
-
A.
Na2O
-
B.
MgO
-
C.
Al2O3
-
D.
SiO2
Solution
Aluminum oxide (Al2O3) is an amphoteric oxide, meaning it can react with both acids and bases.
Correct Answer: C — Al2O3
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Q. Which of the following compounds is an example of a coordination complex? (2022)
-
A.
NaCl
-
B.
CuSO4
-
C.
[Cu(NH3)4]SO4
-
D.
Fe2O3
Solution
[Cu(NH3)4]SO4 is a coordination complex where copper is coordinated to ammonia ligands.
Correct Answer: C — [Cu(NH3)4]SO4
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Q. Which of the following compounds is formed when magnesium reacts with oxygen? (2019)
-
A.
MgO
-
B.
MgO2
-
C.
Mg2O3
-
D.
Mg3O4
Solution
Magnesium reacts with oxygen to form magnesium oxide (MgO).
Correct Answer: A — MgO
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