Question

Two substances, A and B were made to react so a third substance, A2B is formed according to the following reaction:
2 A + B → A2B
Which of the following statements concerning this reaction are incorrect?
(i) The product A2B shows the properties of substances A and B
(ii) The product will always have a fixed composition
(iii) The product so formed cannot be classified as a compound
(iv) The product so formed is an element
(a) (i), (ii) and (iii)
(b) (ii), (iii) and (iv)
(c) (i), (iii) and (iv)
(d) (ii), (iii) and (iv)



Two chemical species X and Y combine together to form a product P which contains both X and Y
X + Y → P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
(a) (i), (ii) and (iii)
(b) (i), (ii) and (iv)
(c) (ii), (iii) and (iv)
(d) (i), (iii) and (iv)



Which of the following methods would you use to separate cream from milk?
(a) Fractional distillation
(b) Distillation
(c) Centrifugation
(d) Filtration



Cooking of food and digestion of food:
(a) are both physical processes
(b) are both chemical processes
(c) cooking is physical whereas digestion is chemical
(d) cooking is chemical whereas digestion is physical



 Ice, water and water vapour look different and display different …………. properties but they are ………… the same.



A mixture of two or more miscible liquids, for which the difference in the boiling points is less than 25 K can be separated by the process called ………….​

Answer 1

Answer:

Explanation:

c) ( i ), (iii) , (iv)

d). (i), (iii) and (iv)

(c) Centrifugation

c) cooking is physical whereas digestion is chemical

Ice, water and water vapour look different and display different physical properties but they are chemically the same.

Fractional distillation is used for the separation of a mixture of two or more miscible liquids for which the difference in boiling points is less than 25K.

Hope it helps u !!

Answer 2

Answer:

c) (i), (iii), (iv)

d). (i), (iii) and (iv)

(c) Centrifugation

c) cooking is physical whereas digestion is chemical

Ice, water and water vapour look different and display different physical properties but they are chemically the same.

Fractional distillation is used for the separation of a mixture of two or more miscible liquids for which the difference in boiling points is less than 25K.

Hope it helps u !!