Which of the following pairs will give displacement reactions ?
$NaCl$ solution and copper metal
$MgCl_{2}$ solution and aluminium metal
$FeSO_{4}$ solution and silver metal
$AgNO_{3}$ solution and copper metal
What chemical process is used for obtaining a metal from its oxide ?
Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
$(i)$ Write the electron-dot structures for sodium. oxygen and magnesium.
$(ii)$ Show the formation of $Na _{2} O$ and $MgO$ by the transfer of electrons.
$(iii)$ What are the ions present in these compounds ?
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
Which metals do not corrode easily ?