Question 1 :
Which of the following reaction requires oxygen to be a reactant ?

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

Question 3 :
The reaction of hydrochloric acid with zinc oxide to form zinc chloride and water is neutralization reaction. State whether the statement is true or false

Question 4 :
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 7 :
What is the difference between displacement over double displacement reactions ?

Question 12 :
Ferrous sulphate decomposes with the evolution of a gas having&#160;a characteristic odour of burning sulphur. Identify the type of reaction.<br/>

Question 13 :
$H_{2}S$ is passed through an acidified solution of copper sulphate and a black precipitate is formed. This is due to:

Question 14 :
Select the correct alternative.<br/>The reaction between acid and base to form salt and water is an example of :

Question 15 :
In a change hydrogen peroxide gives rise' to hydrogen oxide and oxygen. This is an example of:

Question 16 :
Minimum amount of $Ag_2CO_3$ (s) required to produce sufficient amount of oxygen for the complete &#160;combustion of $C_2H_2$ which produces 11.2 L of $CO_2$ at STP after combustion is_________.<br/>$Ag_2CO_3 (s) \, \rightarrow\, 2Ag (s)\, +\, CO_2 (g)\, +\, \dfrac12 O_2 (g)$<br/>$C_2H_2\, +\, \dfrac52 O_2\, \rightarrow\, 2CO_2\, +\, H_2O$<br/>

Question 17 :
How much $CaO$ is to be added to the furnace charge for each $1280\ kg$ of pure $CaC_{2}$ produced ?

Question 18 :
A quantity of 5.68 g of pure $ P_{4}O_{10} $ is dissolved completely in sufficient water and the solution is diluted to 250 ml. Which of the following statement (s) is/are correct?

Question 19 :
What mass of ammonium nitrate should be heated to produce 8.96 litres of steam?&#160;[Note : Relative molecular mass of $NH_4NO_3$ is 80]

Question 20 :
A metal ($A$) on heating in nitrogen gas gives compound $B$. $B$ on treatment with ${H}_{2}O$ gives a colourless gas which when passed through $Cu{SO}_{4}$ solution gives a dark blue-violet coloured solution. $A$ and $B$ respectively, are :