Question

i. Match the given words in list I with the words in list II and select the correct options:

List I List II
(P) Sodium chloride (1) Washing soda
(Q) Sodium carbonate (2) Drain cleaner
(R) Sodium bicarbonate (3) Antacid
(S) Sodium hydroxide (4) Adds taste to food
a. P – 3; Q – 1; R – 4; S – 2
b. P – 4; Q – 1; R – 3; S - 2
c. P – 2; Q – 3; R – 1; S – 2
d. P – 2; Q – 4; R – 1; S - 3

ii. A dog pants with its tongue sticking out on a hot day. Identify the correct reason/ reasons from
the following statements:
P) Dogs cool their bodies using the evaporation of moisture from the mouth and tongue
Q) It is their habit
R) They cool their body by exchanging the hot air of their lungs with cooler external air.
S) It is a genetic disease found in few animals like dogs
a. All four options are correct
b. Options P) and Q) are correct
c. Options P) and R) are correct
d. Only option P) is correct

iii. Which of the following will result in a chemical change?
P) Making a milkshake with banana, milk and sugar
Q) Mixing of milk and sugar
R) Adding a spoon of curd to milk
S) Diluting curd with water to make butter milk
a. only (R)
b. (P) and (R)
c. (P), (R) and (S)
d. only (P)

iv. Which of the following statements are correct?
P) The tangy taste of cola drinks are due to carbonic acid which is an organic acid.
Q) Inorganic acids are prepared artificially.
R) Hydrofluoric acid reacts with metals and hence is stored in glass bottles.
S) Organic acids are weak acids and are used as food additives.
a. (P), (Q) and (R) b. (P) and (S)
c. (Q) and (S) d. (P), (Q), (R) and (S)

Answer 1

Answer:

i. Match the given words in list I with the words in list II and select the correct options:

List I List II

(P) Sodium chloride (1) Washing soda

(Q) Sodium carbonate (2) Drain cleaner

(R) Sodium bicarbonate (3) Antacid

(S) Sodium hydroxide (4) Adds taste to food

a. P – 3; Q – 1; R – 4; S – 2

b. P – 4; Q – 1; R – 3; S - 2

c. P – 2; Q – 3; R – 1; S – 2

d. P – 2; Q – 4; R – 1; S - 3

ii. A dog pants with its tongue sticking out on a hot day. Identify the correct reason/ reasons from

the following statements:

P) Dogs cool their bodies using the evaporation of moisture from the mouth and tongue

Q) It is their habit

R) They cool their body by exchanging the hot air of their lungs with cooler external air.

S) It is a genetic disease found in few animals like dogs

a. All four options are correct

b. Options P) and Q) are correct

c. Options P) and R) are correct

d. Only option P) is correct

iii. Which of the following will result in a chemical change?

P) Making a milkshake with banana, milk and sugar

Q) Mixing of milk and sugar

R) Adding a spoon of curd to milk

S) Diluting curd with water to make butter milk

a. only (R)

b. (P) and (R)

c. (P), (R) and (S)

d. only (P)

iv. Which of the following statements are correct?

P) The tangy taste of cola drinks are due to carbonic acid which is an organic acid.

Q) Inorganic acids are prepared artificially.

R) Hydrofluoric acid reacts with metals and hence is stored in glass bottles.

S) Organic acids are weak acids and are used as food additives.

a. (P), (Q) and (R) b. (P) and (S)

c. (Q) and (S) d. (P), (Q), (R) and (S)