Assertion (A) : No work is done by gravitational force if a body moves along a horizontal surface.Reason (R) : In horizontal motion, angle between gravity and displacement is 900.
Assertion (A): Sodium metal is stored in kerosene
Reason (R): The density of sodium is less than water
Assertion (A) : A man standing on a completely frictionless surface can propel himself by whistling.Reason (R) : If no external force acts on a system, its momentum cannot change. Codes
Assertion (A): Solvay process is used for the preparation of NaHCO3 but not for KHCO3
Reason (R): Solubility of KHCO3 is more than NaHCO3 in water
Assertion––––––––––– (A): The boiling point of HF is higher than that of H2O. Reason–––––––– (R): The hydrogen bond strength in HF is lower than that in H2O.
Assertion: If x≠y, then (x,y)≠(y,x) Reason: If x=y, then (x,y)≠(y,x) Which of the following is correct?