Chemistry

Which of the following is the relative molecular mass of a compound which has empirical formula CH2O? (H = 1; C = 12; O = 16)

A. 42 B. 45 C. 126 D. 180 E. 145 Correct Answer: Option D - 180 Explanation Empirical formula =…

5 years ago

The following oxides react with both acids and bases to form salts except?

A. zinc oxide B. lead (ll) oxide C. aluminium oxide D. tin (IV) oxide E. carbon (IV) oxide Correct Answer:…

5 years ago

Which of the following is used as water softener?

A. Na2CO3.10H2O B. CuSO4. 5H2O C. MgSO4. 7H2O D. CaCI2.2H2O E. Na2SO4. 10H2O Correct Answer: Option A - Na2CO3.10H2O

5 years ago

Which of the following when heated strongly in air will leave a metal as residue?

A. Sodium trioxonitrate (V) B. Potassium trioxonitrate (V) C. Silver trioxonitrate (V) D. Lead (ll) trrioxonitrate(V) E. Aluminium trioxonitrate (V)…

5 years ago

When chlorine is added to slaked lime, the product obtained is?

A. bleaching powder B. chlorinated water C. hydrochloric acid D. oxochlorate (l) acid E. trioxochlorate (V) salt Correct Answer: Option…

5 years ago

The reaction between alkanoic acids and alkanols in the presence of a mineral acid is known as?

A. saponification B. hydrolysis C. polymerization D. esterification E. dehydration Correct Answer: Option D - esterification

5 years ago

Ethene undergoes mainly addition reactions because it is?

A. a gas B. a hydrocarbon C. unsaturated D. easily polymerized E. a covalent compound Correct Answer: Option C -…

5 years ago

Separation of mixture of solids by physical methods can be based on differences in the following except?

A. melting point B. solubility C. particle size D. molar mass E. magnetic property Correct Answer: Option D - molar…

5 years ago

The position of equilibrium in a reversible reaction is affected by ______?

A. particle size of the reactants B. change in concentration of the reactants C. change in size of the reaction…

5 years ago