Question 1 :
The conversion of ${Cr}_{2}{O}_{7}^{2-}$ to ${Cr}^{3+}$ during a chemical reaction is an example of:

Question 9 :
Balanced chemical equations imply which of the following?<br>$I$. Numbers of molecules are conserved in chemical change<br>$II$. Numbers of atoms are conserved in chemical change.<br>$III$. Mass is conserved in chemical change.

Question 10 :
Identify the type of reaction which will occur based on the information provided about the reactants:<br>${CH}_{4}(g)+{O}_{2}(g)\rightarrow$

Question 11 :
What is the difference between displacement over double displacement reactions ?

Question 12 :
$KXO_3$(s) well mixed with water, temperature of solution falls. This reaction is:<br/>

Question 13 :
Three cations $A, B, C$ are allowed to react with ammonium hydroxide solution. $A$ and $B$ produce a dirty green precipitate and a reddish brown precipitate respectively, both of which do not dissolve on further addition of ${NH}_{4}OH$. $C$ gives pale blue colour precipitate with less amount of ammonium hydroxide and on further addition of ${NH}_{4}OH$, precipitate becomes soluble and deep blue colour solution is formed:

Question 15 :
In the reaction, $4Fe+3O_2\rightleftharpoons 4Fe^{3+}+6O^{2-}$ Which of the following statements is incorrect?