Question 2 : 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) Electrolytic reduction</td> <td>(i) Aluminium</td> </tr> <tr> <td>(B) Reduction with carbon</td> <td>(ii) Zinc</td> </tr> <tr> <td>(C) Reduction with aluminium</td> <td>(iii) Sodium</td> </tr> <tr> <td> </td> <td>(iv) Iron</td> </tr> <tr> <td> </td> <td>(v) Manganese</td> </tr> <tr> <td> </td> <td>(vi) Chromium</td> </tr></tbody></table></blockquote>
Question 4 :
Assertion: Ionic compounds are bad conductors of electricity.
Reason: In ionic compounds mobile ions exists.
Question 5 :
The process of protecting iron by coating with zinc is called:
Question 9 :
$2ZnS(s) + 3O_{2}(g) \xrightarrow {heat} 2ZnO(s) + 2SO_{2}(g)$ is an example of which type of reaction?
Question 12 :
When dilute hydrochloric acid is added to granulated zinc placed in a test tube, the observation made is _____________.
Question 13 :
The valence electronic configurations of two elements are $4s^1$ and $3s^2 3p^5$ respectively. The type of bond expected to be present between them is:
Question 16 :
Name one metal that will not react with cold water but will react with steam.
Question 18 :
Write true or false for the following statements :<br>Hydrogen gas is evolved when a metal reacts with nitric acid .
Question 19 :
$Cl^- - e^- \rightarrow Cl$ occurs at __________ and<br>$Cl + Cl \rightarrow Cl_2$ occurs at ___________.
Question 21 :
Among the following pairs of oxides, In which pair both are reduced by carbon?
Question 22 : <p>Some of the following metals are obtained by electrolysis of their fused salts.</p><p>$Al, Na, Cu, Ag, Mg, Ca$<br/></p><p>These metals are:</p>
Question 23 :
Assertion: Statement $\displaystyle -$ 1 : The first ionisation energy of N is greater than O.
Reason: Statement $\displaystyle -$ 2 : N atom has half filled p $\displaystyle -$ orbitals.
Question 24 :
The element X reacting with chlorine forms a water soluble compound having high melting point. Element X is:
Question 25 :
Assertion: Ionic bonds are always stronger than covalent bonds.Reason: They break only when bombarded with electrons.
Question 26 :
Sodium is made by the electrolysis of molten mixture of about $40\% \ NaCl$ and $60\%$ $CaCl_2$ because:
Question 30 :
In $Fe-$extraction, the roasting is adopted though the ore is no having any sulphide because:
