Which of the following statements are true for pure substances? ​

(i) Pure substances can be a compound or a mixture.​

(ii) Pure substances have the same composition throughout the sample.​

(iii) Pure substances can be either an element or a compound.​

(iv) Pure substances have constant properties throughout the sample.

(A) i and iii
(B) i, ii, and iv
(C) ii, iii, and iv

Q. Which of the following statements are true for pure substances ?
(i) pure substances contain only one kind of particles
(ii) pure substances may be compounds or mixtures
(iii) pure substances have the same composition throughout
(iv) pure substances can be exemplified by all elements other than nickel

(a) (i) and (ii)
(b) (i) and (iii)
(c) (iii) and (iv)
(d) (ii) and (iii)

Q. Which of the following statements are true for pure substances?
(i) They contain only one kind of particles.
(ii) They can be compounds or mixtures.
(iii) They have the same composition throughout the substance.
(iv) They are formed by the physical combination of substances.

Q. Question 8
Two substances, A and B were made to react to form a third substance, $A_{2}B$ according to the following reaction $2A+B\to A_{2}B$. Which of the following statements concerning this reaction are incorrect?
(i) The product $A_{2}B$ 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)

Q. Two chemical substances X and Y combine together to form a product P which contains both X and Y X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning 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)