Category «Engineering Chemistry»

CHEMICAL THERMODYNAMICS – 1

1) The heat of formation of an explosive compound like NCl3 is a) Positive b) Negative c) Zero d) Positive or negative 2) Lithium is the best reducing agent due to a) Low ionisation energy b) Small ionic radius c) Low heat of sublimation d) High enthalpy of hydration 3) Which of the following correctly …

States of Matter – III

1) Which of the following statements is false regarding liquids? a) Liquids diffuse more slowly than gases b) During evaporation of liquids, heating is always caused c) Vapour pressure of liquids increases with a rise in temperature d) Viscosity of liquids decreases with a rise in temperature. 2) The characteristic features of solids are their …

States of Matter – V

1) Which of the following is a covalent solid? a) Fe b) Diamond c) NaCI d) Cu 2) The 8:8 type of packing is present in a) NaCl b) KCl c) CsCl d) 3) An aqueous solution of methanol has a vapour pressure a) equal to that of water b) equal to that of methanol …

States of Matter – IV

1) The co-ordination number of ions in CsCI structure is a) 4:4 b) 6:6 c) 8:8 d) 4:8 2) CsCI structure has a) fcc arrangement b) bcc arrangement c) ccp arrangement d) hcp arrangement 3) A unit cell of CsCI consists of a) one CsCI unit b) two CsCI units c) four CsCI units d) …

States of Matter – II

1) With an increase in temperature, the difference between the r.m.s velocity and the average velocity will a) increase b) decrease c) remain same d) decrease becoming almost zero at a high temperature 2) At what temperature is the K.E of a gas molecule half that of its value at ? a) b) c) d) …

States of Matter – I

1) In order for the volume of 800 c.c. of a gas to be reduced to 25%, to what temperature is the gas is to be cooled if the initial temperature is 270at constant P? a) 75 K b) 225 K c) 300 K d) -750 c 2) Under identical conditions how many times faster …