1
nature?
Short-answer type questions (II)
1. (a) Name the source from which litmus solution is obtained. What is the use of this solution?
(b) is the distilled water acidic/basic/neutral? How would you verify it?
2. (a) Ammonia is found in many household products, such as window cleaners
. It tuma red litmos blue. What is its
(b) Dheeraj has a few bottles of soft drink in his shop. But unfortunately, these are not labelled
He has to serve the drinks on the demand of customers. One customer wants acidic drink, another
wants basic and third one wants neutral drinks. How will Dheera, decide which drink is to be served to whom?
3. (a) Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution
How will you identify them? You have only turmeric indicator.
(b) Name two acids found in fruits.
4. What is a universal indicator? How is it related to pH?
Answers
Answer:
Exercise 15.3
In a rectangular garden of 100 m long and 75 m broad a walkway of 5 m wide is built inside the
garden. Find the area of the walkway,
Ta a rectangular wooden frame of length 20 cm and breadth 12 cm, a rectangular picture 16 cm
long and 8 cm wide is fixed exactly at the centre. Find the area of the margin.
A chart paper measures 4 mx 3 m. A strip of 1 m wide is cut out from all around. Find the area
of the remaining chart paper and the area of cut out strip.
A balcony of width 3 m is constructed all along outside a rectangular room which is 14 m
long
and 9 m wide. Find the area of balcony. If the cost of cementing the floor of balcony is
35 per m². Find the cost of flooring are the balcony.
Two crossroads, each of width 15 m constructed at right-angles through the centre of a
rectangular garden of length 500 m and breadth 200 m are parallel to its sides. Find the area
the roads.