Q. What is the color of the solution formed when copper(II) ions react with ammonia?
-
A.
Blue
-
B.
Green
-
C.
Red
-
D.
Yellow
Solution
The reaction of copper(II) ions with ammonia forms a deep blue solution due to the formation of the complex ion [Cu(NH3)4]2+.
Correct Answer:
A
— Blue
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Q. What is the common oxidation state of chromium in chromate ions?
Solution
Chromium in chromate ions (CrO4^2-) has a common oxidation state of +6.
Correct Answer:
D
— +6
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Q. What is the electron configuration of the element with atomic number 30?
-
A.
[Ar] 4s2 3d10
-
B.
[Kr] 5s2 4d10
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C.
[Ar] 4s2 3d8
-
D.
[Xe] 6s2 4f14 5d10
Solution
The element with atomic number 30 is Zinc (Zn), and its electron configuration is [Ar] 4s2 3d10.
Correct Answer:
A
— [Ar] 4s2 3d10
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Q. What is the maximum oxidation state of manganese in its compounds?
Solution
Manganese can exhibit a maximum oxidation state of +7, as seen in potassium permanganate (KMnO4).
Correct Answer:
C
— +7
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Q. What is the primary use of titanium in industry?
-
A.
Electrical wiring
-
B.
Aerospace components
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C.
Building materials
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D.
Jewelry
Solution
Titanium is primarily used in aerospace components due to its high strength-to-weight ratio and corrosion resistance.
Correct Answer:
B
— Aerospace components
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Q. Which of the following compounds contains a d-block element?
-
A.
NaCl
-
B.
MgO
-
C.
Fe2O3
-
D.
CaF2
Solution
Fe2O3 contains iron (Fe), which is a d-block element.
Correct Answer:
C
— Fe2O3
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Q. Which of the following elements has the highest melting point?
-
A.
Titanium
-
B.
Vanadium
-
C.
Chromium
-
D.
Manganese
Solution
Chromium has the highest melting point among the given elements, due to its strong metallic bonding.
Correct Answer:
C
— Chromium
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Q. Which of the following elements is a lanthanide?
-
A.
Zirconium
-
B.
Neodymium
-
C.
Tantalum
-
D.
Hafnium
Solution
Neodymium (Nd) is a lanthanide element, while the others are transition metals.
Correct Answer:
B
— Neodymium
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Q. Which of the following is a characteristic property of transition metals?
-
A.
High electronegativity
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B.
Variable oxidation states
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C.
Low melting points
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D.
Non-conductive
Solution
Transition metals are known for their variable oxidation states, which is a key characteristic.
Correct Answer:
B
— Variable oxidation states
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Q. Which of the following is a property of lanthanides?
-
A.
High density
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B.
Low reactivity
-
C.
Non-magnetic
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D.
Colorless
Solution
Lanthanides are known for their high density, which is a characteristic property of these elements.
Correct Answer:
A
— High density
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