1. Substances that are ________________ in taste and change blue litmus _____________
are called _____________________ and substances that are bitter in taste and change
_________________ litmus ______________ are called _________________.
2. __________________ and ___________________ are the ions produced by acids and bases
when they dissociates in water respectively.
3, Bases that are ___________________ in water are called alkalis.
4. HCl is a strong acid whereas acetic acid is a weak acid because _____________________________________________________________________________________
_____________________________________________________________________________________
5. The concentration of ______________ ion and ________________ ion per unit volume
decreases on mixing of an acid or base with water.
6. The process of dissolving an acid or base is a highly ______________ one. The acid must
always be slowly added to water with constant stirring. If water is added to conc. acid,
then__________________________________________________________________
______________________________________________________________________
______________________________________________________________________
7. When Zn granules is added to the test tube containing dil HCl we observe:
a.
b.
8. The gas given out is hydrogen which can be tested by _____________________________________________________________________________________
9. Sodium carbonate /sodium bicarbonate + HCl → _______ gas
Characteristics of the gas:
____________________________________________________________________________________
Test for the gas:
____________________________________________________________________________________
10. NaOH(dil) + phenolphthalein→ ____________ colour
On adding dilute _________________ the pink colour gradually ___________________
because a __________________ reaction takes place .
11. Products of neutralization reaction is :
_____________________________________________________________________________________
12.An indicator is a
_____________________________________________________________________________________
13. Indictors help us to distinguish whether a substance is ____________ or ____________ .
14. Two types of indicator are ___________________ and _______________ .
15. Two synthetic indicators are __________________ and _________________ .
Complete the following table:
Acids Bases
Phenolphthalein
(colourless) ------ ---------
Methyl Orange ------------ ------------
17. pH stands for potenz , meaning _______________ of __________ ion concentration.
18. Higher the hydronium _________________ concentration, _________________ is the pH value.
19. Acid rain has pH ___________________ .
20. a. If the soil is acidic it can be neutralized by adding __________________ ,
____________________ or calcium carbonate.
b If the soil is _____________________ it can be neutralized by adding dil HCl or dil HNO3 .
c. Tooth enamel is made up of ______________________________.
d. Tooth decay starts when the __________________of the mouth is lower than _________________
.
21. What is produced in the mouth by degradation of sugar and food particles? State the best way to prevent tooth decay.
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
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