Chemistry

Which of the following is physical change?

A. Burning kerosene B. Freezing ice cream C. Exposing white phosphorus D. Dissolving calcium in water Correct Answer: Option B…

4 years ago

What volume of oxygen is produced from the decomposition of 2 moles of KCIO3 at s.t.p? [Molar volume of a gas at s.t.p = 22.4 dm³]

A. 22.4 dm³ B. 33.6 dm³ C. 44.8 dm³ D. 67.2 dm³ Correct Answer: Option D - 67.2 dm³ Explanation…

4 years ago

Vulcanization involves the removal of?

A. A monomer B. The single bond C. The double bond D. A polymer Correct Answer: Option C - The…

4 years ago

Which of these reagents can confirm the presence of a triple bond?

A. Bromine water B. Acidified KMnO4 C. Copper (I) chloride D. Bromine gas Correct Answer: Option C - Copper (I)…

4 years ago

A characteristic of the alkane family is?

A. Addition reaction B. Elimination reaction C. Substitution reaction D. Neutralization reaction Correct Answer: Option C - Substitution reaction

4 years ago

The alkyl group can be represented by the general formula?

A. CnH2n+1 B. CnH2n C. CnH2n+2 D. CnH2n-2 Correct Answer: Option A - CnH2n+1

4 years ago

Oxyacetylene flame is used for iron-welding because it?

A. Makes the iron metals solidify very quickly B. Combines with oxygen to give a pop sound C. Evolves a…

4 years ago

Sodium metal is always kept under oil because it?

A. Readily reacts with water B. Is reduced by atmospheric nitrogen C. Reacts vigorously on exposure to air D. Reacts…

4 years ago

Transition metals possess variable oxidation states because they have?

A. Electrons in the d orbitals B. Electron in the s orbitals C. A variable number of electrons in the…

4 years ago

CH3COOH(g) → CH4(g) + CO2(g). The reaction is?

CH3COOH(g) → CH4(g) + CO2(g) A. Carboxylation B. Decarboxylation C. Acidification D. Esterification Correct Answer: Option B - Decarboxylation

4 years ago