From the above diagram; The caustic soda in the conical flask serves to
dry ethene gas
remove carbon (iv) oxides from ethene
remove carbon (ii) oxide from ethene
remove sulphur (iv) oxide from ethene
Correct answer is B
Caustic soda, \(NaOH\) , serves to remove gaseous impurities from the gas evolved during the laboratory preparation of ethene. Basically, the major impurities are Sulphur (IV) oxide and Carbon (IV) oxide.
CH3COOH
CH3COOCH3
CH3COOC2H5
C2H5COOCH3
Correct answer is A
No explanation has been provided for this answer.
Clothes should be properly rinsed with water after bleaching because
the bleach decolourizes the clothes
chlorine reacts with fabrics during bleaching
the clothes are sterilized during bleaching
hydrogen chloride solution is produced during bleaching
Correct answer is D
No explanation has been provided for this answer.
+7 to +2
+6 to +2
+5 to +2
+4 to +2
Correct answer is A
\(MnO_{{4}{(aq)}}\) has a charge of \(-1\)
Let the oxidation number of \(Mn\) in \(MnO_{{4}{(aq)}}\) be X
Recall, the oxidation number of \(O_{2}\) is \(-2\)
\(\therefore\) \(X + (-2\times 4) = -1\)
\(X - 8 = -1\)
\(X = +7\)
Naturally radioactive
abundant in nature
a transition metal
an isotopic mixture
Correct answer is D
No explanation has been provided for this answer.
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