Question 1 :
Which of the following is an example of the exothermic reaction ?

Question 4 :
Other signs of a chemical reaction might be an increase in temperature if heat is released or a change in _____.

Question 5 :
Which of the following reaction requires oxygen to be a reactant ?

Question 6 :
When chlorine reacts with sodium bromide the solution turns brown because ________.

Question 9 :
The conversion of ${Cr}_{2}{O}_{7}^{2-}$ to ${Cr}^{3+}$ during a chemical reaction is an example of:

Question 11 :
A less reactive metal replaces a more reactive metal from its salt solution in water.<br>

Question 12 :
Which of the following symbol is used to show solid precipitate?

Question 13 :
In $HS^, I^, R-NH_2, NH_3$ order of proton&#160;excepting tendency will be:

Question 15 :
Aqueous solutions of magnesium chloride and silver nitrate are mixed to form solid silver chloride and aqueous magnesium nitrate.<br/><br/>The balanced molecular equation contains which one of the following terms?

Question 17 :
The substance that initially involved in a chemical reaction is called a reactant.

Question 19 :
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: