Chemistry

The mass of an element is 27 and its atomic number is 13. What is the composition of the nucleus of its atom?

A. 13 electrons and 14 protons B. 13 neutrons and 14 protons C. 13 protons and 14 neutrons D. 13…

6 years ago

Which of the following electron transition results in the emission of energy?

A. 3p to 3s B. 3p to 4p C. 2s to 2p D. 1s to 2s Correct Answer: Option A…

6 years ago

In which of the following processes is biotechnology not applied?

A. Manufacture of drugs B. Treatment of domestic sewage C. Production of alcoholic beverages D. Electroplating of metals Correct Answer:…

6 years ago

Which of the following substance is an alloy of lead?

A. Brass B. Duralumin C. Stainless steel D. Soft solder Correct Answer: Option D D. Soft solder

6 years ago

Which of the following pairs of solutions will produce a precipitate when mixed?

A. Pb(NO3)2(aq) and NaCI(aq) B. MgSO4(aq) and HCI(aq) C. ZnCI2(aq) and NaSO4(aq) D. NaOH(aq) and HNO3(aq) Correct Answer: Option A…

6 years ago

Hardness in water can be removed by adding?

A. copper (ll) tetraoxosulphate (IV) B. sodium trioxocarbonate (IV) C. sodium chloride D. alum Correct Answer: Option B B. sodium…

6 years ago

Ethyne undergoes the following reactions except?

A. polymerization B. addition C. substitution D. esterification Correct Answer: Option D D. esterification

6 years ago

Fats are classified as?

A. hydrocarbons B. alkanoates C. alkanols D. carbohydrates Correct Answer: Option B B. alkanoates

6 years ago

The colour of the solution formed when ethyne reacts with an acidic solution of potassium tetraoxomanganate (VII) is?

A. purple B. colourless C. green D. pink Correct Answer: Option B B. colourless

6 years ago

Which of the following substances is a non-reducing sugar?

A. Sucrose B. Glucose C. Fructose D. Maltose Correct Answer: Option A A. Sucrose

6 years ago