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1
KCET 2019
MCQ (Single Correct Answer)
+1
-0

The elements in which electrons are progressively filled in $$4 f$$-orbital are called

A
actinoids
B
transition elements
C
lanthanoids
D
halogens
2
KCET 2019
MCQ (Single Correct Answer)
+1
-0

Incorrect statement with reference to $$\mathrm{Ce}(Z=58)$$ is

A
$$\mathrm{Ce}^{4+}$$ is a reducing agent
B
$$\mathrm{Ce}$$ in +3 oxidation state is more stable than in +4
C
Atomic size of $$\mathrm{Ce}$$ is more than that of $$\mathrm{Lu}$$
D
Ce shows common oxidation states of +3 and +4
3
KCET 2019
MCQ (Single Correct Answer)
+1
-0

A mixture of $$\mathrm{NaCl}$$ and $$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$$ is heated with conc. $$\mathrm{H}_2 \mathrm{SO}_4$$, deep red vapours are formed. Which of the following statements is false?

A
The vapours give a yellow solution with $$\mathrm{NaOH}$$
B
The vapours contain $$\mathrm{CrO}_2 \mathrm{Cl}_2$$ only
C
The vapours contain $$\mathrm{CrO}_2 \mathrm{Cl}_2$$ and $$\mathrm{Cl}_2$$
D
The vapours when passed into lead acetate in acetic give a yellow precipitate
4
KCET 2019
MCQ (Single Correct Answer)
+1
-0

Which of the following statements is wrong?

A
In highest oxidation states, the transition metals show acidic character
B
$$\mathrm{Mn}^{3+}$$ and $$\mathrm{CO}^{3+}$$ are oxidising agents in aqueous solution
C
Metals in highest oxidation states are more stable in oxide than in fluorides
D
All elements of $$3 d$$ series exhibit variable oxidation states
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