Question

7(i) The substance B shows which of the following properties?
(I) It is the strongest base among the given substance
(II) It is used in antacid
(III) Ot turns litmus paper to blue
(IV)None of the above
(a) (I) (II)
(b) (II), (III)
(c) (I),(II) and (III)
(d) (IV)
7(ii) The substance D shows which properties?
(a) It can be used as baking soda
(b) It is used in fire extinguisher
(c) It turns red litmus paper to blue
(d) All the above
7 (ii) Arrange the substances in increasing order of their acidic strength
(A,C and E)
(a) C<E<A
(b) A<E<C
(c) A<C<E
(d) E<C<A
7(iv) Which of the following statements is correct?
(a) Substance E can be used as preservative in pickles
(b) Substance D can be used as an antacid
(c)Substance B can also be used as preservative in pickles
(d) None of the above​

Answer 1

Answer:

7 (ii) is d

Explanation:

Answer 2

7(i) The substance B shows the following characteristics:

(c) (I), (II), and (III)

• The substance B has a pH of 10.5 and has a navy blue color. The substance is limewater. Limewater is the strongest base and we know bases turn red litmus blue and limewater can also be used as an antacid.

7(ii) The substance D shows the properties:

(d) All of the above.

• The substance D which has a pH of 8.5 can be seawater or baking soda. Seawater can be used as a fire extinguisher and a pH of 8.5 falls under the scale of alkalis, therefore, it turns red litmus blue.

7(iii) The substances arranged in increasing order of acidic strength are:

(b) A<E<C

• The substance with pH 0 that is substance C is the most acidic which is the battery acid, then comes the substance E with pH 4 which is more acidic than A.

7(iv) The statement which is correct are:

(d) None of the above.

• Substance E will be tomatoes and it cannot be used to preserve pickles.
• Substance D is baking soda which is not an antacid.
• Substance B is limewater and it cannot be used to preserve pickles.