Question

Which of the following precautions are to be taken to perform the experiment to show that CO2 is given out during respiration ?
(i) Conical flask should be air right
(ii) Seeds in the flask should be totally dry
(iii) A small tube with freshly prepared KOH solution should be placed in the flask
(iv) The end of the delivery tube should be above the water level
The correct answer is :
(A) (i) and (ii) (B) (i) and (iii)
(C) co, (ii) and (iii) (0) (i), (ii) and (iv)


CBSE Class X Science VSA (1 Mark)

Answer 1

(B) (i) and (ii) is the option

Answer 2

(C) co, (ii) and (iii)