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1
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
On heating mixture of $$C{u_2}O$$ and $$C{u_2}S$$ will give :
A
$$C{u_2}S{O_3}$$
B
$$CuO + CuS$$
C
$$Cu + S{O_3}$$
D
$$Cu + S{O_2}$$
2
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?
A
The common oxidation states of cerium are +3 and +4
B
Cerium (IV) acts as an oxidizing agent
C
The +4 oxidation state of cerium is not known in solutions
D
The +3 oxidation state of cerium is more stable than the +4 oxidation state
3
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?
A
$$\left( {n - 1} \right){d^3}n{s^2}$$
B
$$\left( {n - 1} \right){d^5}n{s^1}$$
C
$$\left( {n - 1} \right){d^8}n{s^2}$$
D
$$\left( {n - 1} \right){d^5}n{s^2}$$
4
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
Excess of KI reacts with CuSO4 solution and then Na2S2O3 solution is added to it. Which of the statements is incorrect for this reaction?
A
Cu2I2 is reduced
B
Evolved I2 is reduced
C
Na2S2O3 is oxidized
D
CuI2 is formed
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