Chemistry

The gas that gives brown colouration in brown ring test is?

A. NO B. CO2 C. NO2 D. CO Correct Answer: Option A - NO

4 years ago

Steam changes the colour of anhydrous cobalt (II) chloride from?

A. blue to pink B. white to red C. white to green D. blue to white Correct Answer: Option A…

4 years ago

The property which makes alcohol soluble in water is the?

A. boiling point B. hydrogen bonding C. ionic character D. covalent nature Correct Answer: Option B - hydrogen bonding

4 years ago

The substance least considered as a source of environmental pollution is?

A. Lead compounds B. Organophosphorous compounds C. Silicate minerals D. Uranium Correct Answer: Option C - Silicate minerals

4 years ago

25cm³ of a 0.2 mol dm³ solution of Na2CO3 requires 20 cm³ of a solution of HCl for neutralization. The concentration of the HCl solution is?

A. 0.5 mol dm³ B. 0.6 mol dm³ C. 0.2 mol dm³ D. 0.4 mol dm³ Correct Answer: Option A…

4 years ago

Three drops of a 1.0 mol dm−³ solution of NaOH are added to 20 cm³ of a solution of pH 8.4. The pH of the resulting solution will be?

A. Close to that of pure water B. Unaltered C. Greater than 8.4 D. Less than 8.4 Correct Answer: Option…

4 years ago

When a salt loses its water of crystallization to the atmosphere on exposure; the process is said to be?

A. Efflorescence B. Deliquescence C. Effervescence D. Fluorescence Correct Answer: Option A - Efflorescence

4 years ago

Tetraoxosulphate (VI) acid burns the skin by?

A. Hydrolysis B. Hydration C. Heating D. Dehydration Correct Answer: Option D - Dehydration

4 years ago

The product of the electrolysis of dilute sodium hydroxide using platinum electrodes are?

A. Hydrogen and oxygen gases B. Water and hydrogen gas C. Water and sodium metal D. Sodium metal and oxygen…

4 years ago

What is the change in the oxidation number of copper in the reaction below?

CU2S(s) + O2(g) → 2CU(s) + SO2(g) A. +1 to 0 B. 0 to +2 C. +2 to +1 D.…

4 years ago