Question 1 :
Most of the metals which occurs in native state in nature:
Question 2 :
We have $CuSO_4$ solutions (blue) in two beakers A and B. In beaker A we add Ag pieces and in B we add Zn pieces. What will happen in A if :<br/>1. $Cu^{2+}$ is reduced to Cu<br/>2. no reaction.
Question 3 :
In CaF$_2$, the number of electron(s) transferred from calcium to fluorine atoms are_____.
Question 4 :
The attraction between molecules and salt, when a salt is dissolved in water molecules, is :
Question 5 :
State whether true or false :<br/><br/>All the elements having one electron in their outermost shell are metals.
Question 8 :
If a metal has low oxygen affinity, then the purification of metal may be carried out by:<br/>
Question 9 :
Which of the following equilibria would have the lowest value of $K_{p}$ at a common temperature?
Question 10 :
Assertion (A): In the electrolysis of aqueous NaCl,Na is preferentially discharged at the mercurycathode forming sodium amalgam.<br>Reason (R) : It is due to the fact that hydrogenhas a high over voltage at mercury cathode.<br>
Question 11 :
Effervescence is seen when a bottle of soda water is opened.
Question 13 :
Assertion: pH of a neutral solution is always $7$.
Reason: pH of a solution does not depend upon temperature.
Question 14 :
When $NH_{3}(0.1\ M) 50\ ml$ mix with $HCl (0.1\ M)\ 10\ ml$ then what is $pH$ of resultant solution $(Pk_{b} = 4.75)$.
Question 16 :
The pH of a solution prepared by mixing 2 M, 100 mL $HCl$ and 1 M, 200 mL NaOH at $25^oC$ is:
Question 17 :
Bleaching powder is obtained by the interaction of $Cl_2$ with a:
Question 18 :
Which of the following negative radical is present in bleaching powder?
Question 19 :
Available chlorine can be liberated from bleaching powder by the reaction with:<br/>
Question 20 :
The first and second dissociation constants of an acid $H_{2}A$ are $1.0\times 10^{-5}$ and $5.0\times 10^{-10}$ respectively. The overall dissociation constant of the acid will be:
Question 22 :
Number of $OH^-$ in 1 mL solution of pH = 13 is:
Question 23 :
The $pH$ of $0.1M$ solution of the following salts increases in the order:
Question 24 :
What is the difference between displacement over double displacement reactions ?
Question 29 :
Give an example of each of the following chemical changes: An endothermic reaction <br/>
Question 31 :
A quantity of $6\ g\ NaOH$ and $4.4\ g\ CO_{2}$ is allowed to react to form $Na_{2}CO_{3}$ or $NaHCO_{3}$ or both. Which of the following is correct statement regarding the reaction?
Question 32 :
What is the minimum mass of ${ CaCO }_{ 3 }(s)$, below which it decomposes completely, required to established equilibrium in a $6.50\ litre$ container for the reaction:<br/>${ CaCO }_{ 3 }(s)\rightleftharpoons CaO(s)+{ CO }_{ 2 }(g);\space { K }_{ c }=0.005\ mole/litre$<br/>
Question 33 :
Which of the following chemical reaction is balanced as well as is combustion reaction?
