Question 2 :
During electrolytic refining of copper.<br/>(a) Pure copper acts as anode.<br/>(b) Pure copper acts as cathode.<br/>(c) Impure copper acts as anode.<br/>(d) Impure copper acts as cathode.<br/>

Question 5 :
During extraction of metals, electrolytic refining is used to obtain pure metals.&#160;Material which will be used as anode, for refining of silver metal by this process, is:<br/>

Question 6 :
Which one of the methods given in column- I is applied for the extraction of the metal given in column II:<br/><blockquote><table class="wysiwyg-table"> <tbody><tr> <td><b>Column -I</b></td> <td><b>Column - II</b></td> </tr> <tr> <td>(A)&#160;Electrolytic reduction</td> <td>(i)&#160;Aluminium</td> </tr> <tr> <td>(B) Reduction with carbon</td> <td>(ii)&#160;Zinc</td> </tr> <tr> <td>(C) Reduction with aluminium</td> <td>(iii)&#160;Sodium</td> </tr> <tr> <td>&#160;</td> <td>(iv)&#160;Iron</td> </tr> <tr> <td>&#160;</td> <td>(v)&#160;Manganese</td> </tr> <tr> <td>&#160;</td> <td>(vi)&#160;Chromium</td> </tr></tbody></table></blockquote>

Question 11 :
When manganese dioxide is heated with aluminium powder, the products obtained are _________ .<br/>

Question 12 :
&#160;Galvanizing is a process of coating iron with a&#160;metal to prevent it from rusting. The metal is :

Question 13 :
Which among the following metals is employed to provide cathodic protection to iron?

Question 16 :
A magnesium ion has a net positive charge while the magnesium atom has __________.&#160;

Question 17 :
In electrolytic refining, which one is the anode and which is cathode?

Question 20 :
Separation of impurities from the extracted metals is known as __________.

Question 21 :
$Li$, $K$, $Ca$, $Na$, $Mg$, $Al$, $Zn$, $Fe$, $Pb$, $Cu$, $Hg$, $Ag$<br/>Which metal will displace hydrogen from acids but not water?

Question 22 :
Read the following statements and answer as true or false.<br/>Metals occur in nature only as free elements.<br/>

Question 28 :
$2ZnS(s) + 3O_{2}(g) \xrightarrow {heat} 2ZnO(s) + 2SO_{2}(g)$ is an example of which type of reaction?

Question 29 :
In case of formation of ionic compounds, the electronegativity difference between them is&#160;less than 1.7.<br/>

Question 30 :
When an element of very low ionization&#160;potential reacts with an element of very high&#160;electron affinity, then :

Question 31 :
Roasting of sulphides gives the gas $X$ as a byproduct. This is colourless gas with choking smell of burnt&#160;sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic,&#160;acts as a reducing agent and its acid has never been isolated. The gas $X$ is:<br/>

Question 33 :
Assertion: Stannous chloride gives grey precipitate with mercuric chloride, but stannic chloride does not do so. Reason: Stannous chloride is a powerful oxidising agent which oxidises mercuric chloride to metallic mercury.

Question 34 :
Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as :

Question 36 :
Although metals generally form basic oxides, which of the following metals&#160;form an amphoteric oxide?<br/>

Question 37 :
Out of the following reduction process-<br/>$A:&#160;{ Fe }_{ 2 }{ O }_{ 3 }+C\longrightarrow Fe + CO_2$<br/>$B:&#160;ZnO+C\longrightarrow Zn&#160;+ CO_2$<br/>$C:&#160;{ Sn }O_{ 2 }+C\longrightarrow Sn&#160;+ CO_2$<br/>$D:&#160;PbO+C\longrightarrow Pb&#160;+ CO_2$<br/>Correct processes are:

Question 39 :
Which of the following compounds of elements in group IV is expected to be most ionic?<br/>

Question 41 :
Amongst $LiCl$, $ BeCl_2,\ MgCl_2 $ and $RbCl$ the compounds with greatest and least ionic character, respectively are:

Question 42 :
Assertion: Ionic bonds are directional in nature whereas covalent bonds are non-directional. Reason: According to orbital overlap concept, the formation of a covalent bond between two atoms results by pairing of electrons present in the valence shell having same spins.

Question 43 :
When a group IIA atom forms an ion, what charge does it have?