Question 3 :
Which colour appears when few drops of phenolphthalein put into test tube contains lime water?
Question 4 :
If tartaric acid is not added in baking powder, the cake will taste bitter due to te presence of -
Question 5 :
The solution of bleaching powder in water is always a clear solution.<br/>
Question 6 :
$$p{ K }_{ a }$$ values of four acids are given below at $${ 25 }^{ o }C$$. The strongest acid is:
Question 8 :
Assertion: pH of a neutral solution is always $$7$$.
Reason: pH of a solution does not depend upon temperature.
Question 9 :
Water of crystallization is the fixed number of water molecules chemically attached to a unit of a salt in its crystalline form.<br/>
Question 10 :
The acid present in the body of red ant is ________.<br/>
Question 12 :
Effervescence is seen when a bottle of soda water is opened.
Question 13 :
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 19 :
In which of the following reactions does conc.$${ H }_{ 2 }S{ O }_{ 4 }$$ act as an oxidising agent?
Question 20 :
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 21 :
Aquaregia is prepared by mixing conc. $$HCl$$ and $$conc. HNO_3$$ in the ratio ________ 
Question 23 :
$$pK_{a}$$ 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 29 :
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 31 :
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 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 34 :
Which part of tooth, made up of calcium phosphate, is the hardest substance in the body?
Question 36 :
The hydrogen ion concentration of the oceans is about $$2\times10^{-9}\space M$$. What is the $$pH$$?
Question 38 :
If $$H^{+}$$ion concentration of a solution is increasedby $$10$$ times, its $$pH$$ will :<br>
Question 39 :
Which of the following methods is adopted for preparing dilute solution of $${ H }_{ 2 }S{ O }_{ 4 }$$?
Question 40 :
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 41 :
The chloride salt of a certain weak monoacidic organic base is hydrolysed to an extent of $$3$$% in its $$0.1M$$ solution at $${25}^{o}C$$. Given that the ionic product of water is $${10}^{-14}$$ at this temperature, what is the dissociation constant of the base?
