"When sugar is dissolved in waer there is no increase in volume. " Is it true or false ? Comment on the statement keeping in mind the amount of sugar, amount of water etc.

Statement (i) : Sugar does not dissolve in water. Statement (ii) : Oll and saw dust sinks in water. Statement (iii) : Oil and wax are mis-cible with water.

C_(p) is always greater than C_(v) for a gas. Which of the following statements provide, partly or wholly, the reason for this? a) No work is done by a gas at constant volume b) When a gas absorbs heat at constant pressure, its volume must change c) For the same change in temperature, the interal energy of a gas changes by a smallar amount at constant volume than at constant pressure d) The internal energy of an ideal gas is a function only of its temperature

Chemical reactions are invariably assocated with the transfer of energy either in the form of heat or light. In the laboratory, heat changes in physical and chemical processes are measured with an instrument called calorimeter. Heat change in the process is calculated as: q= ms DeltaT , s= specific heat = c Delta T , c= heat capacity Heat of reaction at constant volume is measured using bomb calorimeter. qv= Delta U= internal energy change. Heat of reaction at constant pressure is measured using simple or water calorimeter. q_(p) = Delta H, q_(p) = q_(v) + P Delta V, DeltaH = DeltaU + Delta nRT The amount of energy released during a chemical change depnds on the physical state of reactants and products, the condition of pressure, temperature and volume at which the reaction is carried out. The variation of heat of reaction with temperature and pressure is given by Kirchhoff's equation: (DeltaH_(2)- DeltaH_(1))/(TT_(2)-T_(1)) = DeltaC_(P) (At constant pressure), (DeltaU_(2)- DeltaU_(1))/(TT_(2)-T_(1)) = DeltaC_(V) (At constant volume) The heat capacity of bomb calorimeter (with its contents) is 500J/K. When 0.1g of CH_(4) was burnt in this calorimeter the temperature rose by 2^(@)C . The value of DeltaU per mole will be

Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved ? It turns lime water milky It extinguishes burning splinter It dissolves is a solution of sodium hydroxide It has pungent odour

The following are some state ments regarding dissociation of lime stone according to the equation CaCO_(3(s)) hArr CaO_((s)) + CO_(2(g)) : Delta H = 110 kJ. The reaction is carried in a closed vessel. A) The pressure of CO_(2) increases when temperature is inereased. B) The pressure of CO_(2) inereases when temperature is deereased C) The pressure of CO_(2) increases when amount of CaCO_(3) is decreased. The incorrect statements are .

Ionic bond is defined as the electrostatic force of attraction holding the oppositely charged ions. Ionic compounds are mostly crystalline solids having high melting and boiling points, electrical conductivity in molten state, solubility in water etc., Covalent bond is defined as the force which binds atoms of same or different elements by mutual sharing of electrons in a covalent bond. Covalent compounds are solids, liquids or gases. They are low melting and boiling point compounds. They are more soluble in non polar solvents. The amount of energy released when one mole of ionic solid fonned by close packing of gaseous ions is called