19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following compounds is thermodynamically unstable?
PCl5 on hydrolysis gives
White phosphorus reacts with NaOH to give PH3 and NaH2PO2. This reaction involves
On boiling phosphorus with KOH solution, product formed is
The reaction of P4 with X leads selectively to P4O6. The X is:
The percentage of p-character in the orbitals forming P–P bonds in P4 is:
Which of the following statements is correct regarding the behaviour of white phosphorus?
Red phosphorus is less reactive than white phosphorus because (a)the P—P bond length is greater in red phosphorus
The most stable allotropic form of phosphorus is
White phosphorus is more reactive than N2 because
White phosphorus is kept under
Which of the following statements is correct?
Which one of the following is not an ore of phosphorus?
Platinum reacts with aqua regia to produce chloroplatinic acid represented by the formula
Gold reacts with aqua regia forming
Iodine reacts with concentrated HNO3 to produce
What is the empirical formula of a compound composed of O and Mn in equal weight ratio?
An oxide of metal (M) has 40% by mass of oxygen. Metal M has atomic mass of 24. The empirical formula of the oxide is
A gas has molecular formula (CH)n. If vapour density of the gas is 39, what should be the formula of the compound?
A metal M of equivalent mass E forms an oxide of molecular formula MxOy. The atomic mass of the metals is given by the correct equation (BCECE 2008)
1.520 g of hydroxide of a metal on ignition gave 0.995 g of oxide. The equivalent weight of metal is (JCECE 2008)
An organic compound containing C and H has 92.3% of carbon, its empirical formula is
A Compound contains 69.5% oxygen and 30.5% nitrogen and its molecular weight is 92. The molecular formula of compound is
If two compounds have the same empirical formula but different molecular formula, they must have
What is the percentage of carbon, in ethanol?