Home › CBSE Class 11 › Chemistry › Mechanical Properties of Fluids › Per NCERT Table 5.2, the Δ_f H° of C(diamond) is…
Per NCERT Table 5.2, the Δ_f H° of C(diamond) is which value (note: NOT zero, because graphite — not diamond — is the reference state of carbon)?
A−393.5 kJ/mol
B+1.89 kJ/mol
C+393.5 kJ/mol
D0 kJ/mol
Answer & Solution
Correct answer: B. +1.89 kJ/mol
Per NCERT Table 5.2, C(graphite) = 0 (reference). C(diamond) = +1.89 kJ/mol — slightly less stable than graphite.
Related questions
A wet paint brush forms a fine tip when lifted from water. This is due to:Surface tension is a property of:Honey needs a bigger force than oil to slide a plate at the same speed. Honey is more:Plaque narrows an artery, blood speeds up there and pressure drops. The artery may:Water leaves a hole in an open tank at the speed of a freely falling body. This is:Above a limiting speed called the critical speed, flow becomes:Where a pipe narrows and streamlines crowd together, the fluid speed:The equation of continuity, Av = constant, expresses conservation of: