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1
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
2
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
3
KCET 2019
MCQ (Single Correct Answer)
+1
-0

Oxidation state of copper is +1 in

A
malachite
B
cuprite
C
azurite
D
chalcopyrite
4
KCET 2018
MCQ (Single Correct Answer)
+1
-0
Which of the following oxides shows electrical properties like metals?
A
$\mathrm{SiO}_2$
B
MgO
C
$\mathrm{SO}_2(\mathrm{~s})$
D
$\mathrm{CrO}_2$
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Calculus
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