Question

LACRUISE-SA
What do you understand by an alkali?
Give two examples of:
(a) strong alkalis, (b) weak alkalis.
2. What is the difference between :
(a) an alkali and a base,
(b) the chemical nature of an aqueous solution of HCI
and an aqueous solution of NH3-
3. Name the ions furnished by:
(a) bases in solution, (b) an acid.
4. Give one example in each case :
(a) A basic oxide which is soluble in water,
(b) A hydroxide which is highly soluble in water,
(c) A basic oxide which is insoluble in water,
d) A hydroxide which is insoluble in water,
(e) A weak mineral acid,
(f) A base which is not an alkali,
(g) An oxide which is a base,
(h) A hydrogen containing compound which is not an
acid,
(1) A base which does not contain a metal ion.
5. You have been provided with three test tubes.
One of them contains distilled water and the other two
have an acidic solution and a basic solution respectively.
If you are given only red litmus paper, how will you
identify the contents of each test tube?
6. HCI, HNO3, C,H,OH, CH 20, all contain H atoms but
only HCl and HNO, show acidic character. Why?
7. (a) Dry HCl gas does not change the colour of dry
litmus paper. Why?
(b) Is PbO, a base or not ? Comment.
(C) Do basic solutions also have H*(ag)? Explain why
are they basic by taking an example?
8. How would
you
obtain:
(a) a base from another base,
(b) an alkali from a base,
(c) salt from another salt?
9. Write balanced equations to satisfy each statement
(a) Acid + Active metal → Salt + Hydrogen
(6) Acid + Base → Salt + Water
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Answer 1

I CAN ONLY GIVE THE ANSWER OF (What do you understand by an alkali?)

ANSWER IS THE BASE THAT IS SOLUBLE IN WATER IS CALLED ALKALI