List of top Chemistry Questions

According to Werner's theory, the primary valencies of the central metal atom
According to the first law of thermodynamics, $\Delta U = q + w$. In special cases the statement can be expressed in different ways. Which of the following is not a correct expression?
According to Lewis, the ligands are
According to Lewis concept of acids and bases,ethers are
A x molal solution of compound in benzene has a mole fraction of solute equal to 0.2. The value of x is
A white precipitate is obtained by the hydrolysis of
A Williamson's synthesis of ethers is an example of
A well stoppered thermos flask contains some icecubes. This is an example of
A weather balloon filled with hydrogen at 1 atm and 27$^\circ$C has volume equal to 1200 litres. On ascending, it reaches a place where temperature is -23$^\circ$C and pressure is 0.5 atm. The volume of the balloon is
Which of the following contribute towards photochemical smog formation?
Saline soil contains
Ultraviolet radiation from sun causes a reaction that produces
Most hazardous metal pollutant of automobile exhausts is
Taj may be destroyed by
Which of the following is/are the main agents of soil erosion?
Classical Smog is also known as
Ozone layer of upper atmosphere is being destroyed by
Increased asthmatic attacks in certain seasons are related to
Which one of the following dissolves more rapidly in blood haemoglobin than oxygen ?
A type of zeolite used to convert alcohols directly into gasoline is
A translucent white waxy solid $(A)$ reacts with excess of chlorine to give a yellowish white powder $(B)$. $(B)$ reacts with organic compounds containing $-OH$ group converting them into chloro derivatives. $(B)$ on hydrolysis gives $(C)$ and is finally converted to phosphoric acid. $(A)$, $(B)$ and $(C)$ are
A system has internal energy equal to $E_1$, 450 J of heat is taken out of it and 600 J of work is done on it. The final energy of the system will be
$A$ system absorbs $50 \,kj$ heat and does $20\, kj$ of work. What is the net change in the internal energy of the system?
A suspension of $Ca(OH)_2$ in water is called
A standard hydrogen electrode has a zero potential because