Question 1 :
Which of the following reactions are possible?&nbsp;<br>i) $Mg+CuSO_4 \rightarrow MgSO_4+Cu$<br>ii) $Ca+MgSO_4 \rightarrow CaSO_4+Mg$<br>iii) $Cu+ZnSO_4\rightarrow CuSO_4+Zn$<br>iv) $Fe+MgSO_4 \rightarrow FeSO_4+Mg$&nbsp;

Question 2 :
$KMnO_4+H_2SO_4+FeSO_4 \rightarrow K_2SO_4 + MnSO_4+Fe_2(SO_4)_3+H_2O$<div><br/>Coefficients of sulphuric acid and ferric sulphate in the balanced equation of above reaction are______and ______respectively.</div>

Question 3 :
Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?<br>(i) Displacement reaction<br>(ii) Precipitation reaction<br>(iii) Combination reaction<br>(iv) Double displacement reaction<br>

Question 4 :
Identify the type reaction from the following.<div>$H_2CO_3 (aq) \rightarrow H_2O(l) + CO_2(g)$</div>

Question 6 :
Silver articles become black on prolonged exposure to air. This is due to the formation of

Question 7 :
Which of the following metal evolves hydrogen on reacting with cold dilute&#160;$HNO_{3}$?&#160;

Question 8 :
A student added dilute HCl to a test tube containing zinc granules. Which of the following&#160;<span>observations are correct?</span><br/><span>I. Zinc surface became dull and black.</span><br/><span>II. A gas was evolved which burnt with a pop sound.</span><br/><span>III. The solution remained colourless.</span><br/><br/>

Question 11 :
Which of the following properties generally shows a decreasing trend along a period?

Question 12 :
Which of the following accounts best for the fact that fluorine atom is smaller than that of oxygen?

Question 14 :
Arrange the following elements in the order of their increasing non-metallic character:<div><br/>Li, Be, C, O, F<br/></div>

Question 15 :
<SPAN>Based on general trends in the periodic table, predict which element in each of the following pairs has the most metallic character.<BR>(i) Sn or Pb&nbsp;&nbsp; &nbsp;(ii) Ag or Sr&nbsp;&nbsp; &nbsp;(iii) Al or B&nbsp;&nbsp; &nbsp;(iv) Br or As</SPAN>

Question 17 :
$H_{2}SO_{4(\text{aq})} + 2NaOH_{(\text{aq})} \rightarrow P + 2H_{2}O_{(l)}$<br/>The substance $P$ is _________.&#160;

Question 20 :
The reaction of aluminum atoms displacing hydrogen&#160;ions from sulphuric acid can be represented as:

Question 22 :
Assertion: When a hydrocarbon is combusted in air, carbon monoxide is always the major product.<br/>Reason: Air contains much more nitrogen than oxygen.

Question 23 :
How many elements of unsaturation does a molecule with the chemical formula $C_5H_8$ have?

Question 25 :
The number of C-atoms in second member of an ester is: