Please !!answer !!!!question fast and (answer only if you are fully sure about your answer otherwise just comment )
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We'll analyze each of the statements.
(I) The graph shows that temperature is constant during QR and ST. These represent the boiling point and freezing/melting point of X, respectively, since the substance is losing latent heat at this interval. Therefore, "I" represents cooling of gaseous state of X. Hence, this statement is incorrect.
(II) Following the reasoning laid out above, this statement is correct since ST occurs at 25 C.
(III) The freezing point of X is 25 C, so at 35 C, X exists in liquid state. Therefore, his statement is incorrect.
(IV) Since X is losing latent heat at QR, and it exists in gaseous state before this interval, this statement is correct.
Therefore, the incorrect statements are I and III, hence the correct answer is A.
(I) The graph shows that temperature is constant during QR and ST. These represent the boiling point and freezing/melting point of X, respectively, since the substance is losing latent heat at this interval. Therefore, "I" represents cooling of gaseous state of X. Hence, this statement is incorrect.
(II) Following the reasoning laid out above, this statement is correct since ST occurs at 25 C.
(III) The freezing point of X is 25 C, so at 35 C, X exists in liquid state. Therefore, his statement is incorrect.
(IV) Since X is losing latent heat at QR, and it exists in gaseous state before this interval, this statement is correct.
Therefore, the incorrect statements are I and III, hence the correct answer is A.
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