Question 1 :
The hydrogen ion concentration of the oceans is about $$2\times10^{-9}\space M$$. What is the $$pH$$?
Question 5 :
Which part of tooth, made up of calcium phosphate, is the hardest substance in the body?
Question 6 :
Aquaregia is prepared by mixing conc. $$HCl$$ and $$conc. HNO_3$$ in the ratio ________ 
Question 7 :
$$pK_{a}$$ of acetic acid is <b>4.741</b>. The concentration of $$CH_{3}COONa$$ is <b>0.01</b> M. The pH of $$CH_{3}COONa$$ is?
Question 9 :
The acid present in the body of red ant is ________.<br/>
Question 12 :
Water of crystallization is the fixed number of water molecules chemically attached to a unit of a salt in its crystalline form.<br/>
Question 13 :
If tartaric acid is not added in baking powder, the cake will taste bitter due to te presence of -
Question 14 :
In which of the following reactions does conc.$${ H }_{ 2 }S{ O }_{ 4 }$$ act as an oxidising agent?
Question 15 :
The solution of bleaching powder in water is always a clear solution.<br/>
Question 17 :
Calculate the pH of a solution which is 0.1 M in HA and 0.5M in NaA. Ka for HA is $$1.8\times { 10 }^{ -6 }$$?
Question 18 :
If $$H^{+}$$ion concentration of a solution is increasedby $$10$$ times, its $$pH$$ will :<br>
Question 19 :
$$p{ K }_{ a }$$ values of four acids are given below at $${ 25 }^{ o }C$$. The strongest acid is:
Question 22 :
Statement I: A basic solution has more hydrogen ions than an acidic solution.<br/>Statement II: pH is defined as the -log $$[H^+]$$.<br/>
Question 24 :
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 25 :
Effervescence is seen when a bottle of soda water is opened.
Question 30 :
Assertion: pH of a neutral solution is always $$7$$.
Reason: pH of a solution does not depend upon temperature.
Question 31 :
Four solutions A, B, C and D when tested with universal indicator showed pH as $$4, 11, 7$$ and $$9$$ respectively. Which one of the four solutions is neutral?<br/>
Question 32 :
$$1.0 \ L$$ solution is prepared by mixing $$61 \ gm$$ benzonic acid $$(pK_a = 4.2)$$ with $$72 \ gm$$ of sodium benzoate and then $$\text{300 mL 1.0 M HBr}$$ solution was added. the $$pH$$ of final solution is:-
Question 33 :
When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?
Question 36 :
For making cake, baking powder is taken. If at home your mother uses baking soda instead of baking powder in cake, what is the role of tartaric acid added to baking soda?
Question 39 :
$$pH$$ of saturated solution of silver salt of monobasic acid $$HA$$ is found ton be 9. Find the $$K_{sp}$$ of sparingly soluble salt $$Ag A$$ (s).<br/>Given : $$K_a(HA)=10^{10}$$
Question 41 :
The pH of a 10 ml aqueous solution of HCI is 4. The amount of water to be added to this solution in order to change its pH from 4 to 5 is
Question 42 :
The pH of a $${10}^{-8} M$$ solution of $${CH}_{3}COOH$$ would be:
Question 43 :
$$ CaOCl_2 + H_2O + CO_2 \longrightarrow CaCO_3 + CaCl_2 + HOCl$$ This reaction is simply:
Question 44 :
Bleaching powder is obtained by the interaction of $$Cl_2$$ with a:
Question 45 :
Washing soda on strong heating gives sodium oxide and carbon dioxide.<br/>
Question 47 :
Which of the following has the highest value of pH at the same temperature for the same concentration?
Question 49 :
1 cc of 0.1N $$HCl$$ is added to 999 cc solution of $$NaCl$$. The $$pH$$ of the resulting solution will be:<br/>
Question 50 :
Bleaching powder is effective with cold water, but ineffective with hot water. This is because of:<br/>
