Zinc displaces copper from an aqueous solution of copper (ll) salt because
copper is a transition element
copper is a moderately reactive metal
Zinc and copper have reducing prperties
zinc is more reactive than copper
zinc reacts with both acids and alkalis
Correct answer is D
No explanation has been provided for this answer.
When ammonium chloride is dissolved in water in a test tube, the tube feels colder showing that
the solution is unsaturated
sublimation has ocurred
ammonia gas is evolved
the process is endothermic
condensation has occurred
Correct answer is D
No explanation has been provided for this answer.
The product of the reaction between ethanol and excess acidified K2Cr2O2 is
ethanal
ethylethanoate
ethanoic acid
ethyne
ethanedioic acid
Correct answer is C
No explanation has been provided for this answer.
Which of the following is correct about the electrons in the 1s orbital? They
have the same spin
are easier to remove than those in the 2p orbital
are closest to the nucleus
have the same energy as those in the 2s orbital
have different magnetic quantum numbers
Correct answer is C
No explanation has been provided for this answer.
Which of the following gases are diatomic except
nitrogen
helium
hydrogen
fluorine
oxygen
Correct answer is B
No explanation has been provided for this answer.