1
KCET 2020
MCQ (Single Correct Answer)
+1
-0

For $$\mathrm{Cu}_2 \mathrm{Cl}_2$$ and $$\mathrm{CuCl}_2$$ in aqueous medium, which of the following statement is correct?

A
$$\mathrm{CuCl}_2$$ is more stable than $$\mathrm{Cu}_2 \mathrm{Cl}_2$$
B
Stability of $$\mathrm{Cu}_2 \mathrm{Cl}_2$$ is equal to stability of $$\mathrm{CuCl}_2$$
C
Both are unstable
D
$$\mathrm{Cu}_2 \mathrm{Cl}_2$$ is more stable than $$\mathrm{CuCl}_2$$
2
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
3
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
4
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
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