1
NEET 2021
MCQ (Single Correct Answer)
+4
-1
The incorrect statement among the following is :
A
Actinoids are highly reactive metals, especially when finely divided.
B
Actinoid contraction is greater for element to element than lanthanoid contraction.
C
Most of the trivalent Lanthanoid ions are colorless in the solid state.
D
Lanthanoids are good conductors of heat and electricity.
2
NEET 2021
MCQ (Single Correct Answer)
+4
-1
Which of the following reactions is the metal displacement reaction? Choose the right option.
A
$$2Pb{(N{O_3})_2} \to 2PbO + 4N{O_2} + {O_2} \uparrow $$
B
$$2KCl{O_3}\buildrel \Delta \over \longrightarrow 2KCl + 3{O_2}$$
C
$$C{r_2}{O_3} + 2Al\buildrel \Delta \over \longrightarrow A{l_2}{O_3} + 2Cr$$
D
$$Fe + 2HCl \to FeC{l_2} + {H_2} \uparrow $$
3
NEET 2021
MCQ (Single Correct Answer)
+4
-1
Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of :
A
Having similar chemical properties
B
Belonging to same group
C
Diagonal relationship
D
Lanthanoid contraction
4
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
Identify the incorrect statement.
A
The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.
B
Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
C
The oxidation states of chromium in CrO42- and Cr2O72- are not the same.
D
Cr2+ (d4) is a stronger reducing agent than Fe2+ (d6) in water.
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