Which of the following is not an element [DCE 2001]
22 carat gold is alloy of copper and gold.
Which of the following statements is not true about NaCl structure
[DCE 2001]
[MP PMT 1994, 95; DCE 1999, 2001; AIIMS 2001]
Which of the following is not a nitro-derivative
[DCE 2004]