All the enthalpy changes are________________?

A. Negative
B. Positive
C. May or may not be A or B
D. none

Related Mcqs:

As a substance moves from a solid to a liquid all of the following changes occur except ?
A. molecules become more disordered.
B. K.E of the molecules decreases
C. intermolecular forces become weaker.
D. molecules move more frequently.
For a given process the heat changes at constant pressure (qp) and at constant volume (qv) are related to each other as___________________?
A. qp = qv
B. qp < qv
C. qp > qv
D. qp = qv / 2
When substance moves from a solid to a liquid state all of the following changes occur except__________________?
A. Molecules become more disordered
B. K.E of the molecules decreases
C. Intermolecular forces become weaker
D. Molecule become further separated
Free neutron changes into proton with the emission of__________________?
A. Neutrino
B. Electron
C. Both A & B
D. Meson
Molozonide is unstable and changes into ozonide on_________________?
A. reduction
B. oxidation
C. hydrolysis
D. rearrangement
When 0.01 moles of NaOH are added to a buffer solution, its PH changes from 4.745 to 4.832. What is its?
A. 0.115
B. 0.900
C. 0.015
D. 0.215

Submitted by: Muhammad Ali Kunbhar
The process in which solid changes directly into vapours without passing through liquid state?
A. Decantation
B. Sublimation
C. Evaporation
D. None

Submitted by: Naintara Mustafa
If we provide very high amount of heat to a liquid its boiling point will__________________?
A. increase
B. remains constant
C. decrease
D. there will be no boiling
Isomorphic substances have _______________?
A. Same physical and chemical properties
B. Same physical and different chemical properties
C. Different physical and same chemical properties
D. Different physical and chemical properties
The number of formula units in 29.25g of common salt_________________?
A. 6.022 x 1023
B. 3.01 x 1023
C. 2 x NA
D. 4 x 6.022 x 1023