In H₂O₂ molecule, the angle between two O-H planes is
The activity of carbon-14 in a piece of ancient wood is only 12.5%. If the half life period of carbon-14 is 5760 years, the age of the piece of wood will be
The oxidation number of S in S2⁻ is
Solubility product constants (Ksp) of salts of types MX, MX2 and M3X at temperature 'T' are 4.0 x 10-8, 3.2 x 10-14 and 2.7 x 10-15, respectively. Solubilities (mol dm-3) of the salts at temperature 'T' are in the order
The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Shape of NH3 molecule is tetrahedral.
Reason(R): In NH3 nitrogen is sp3 hydridised.
Among the following, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient conditions is
The CMC (critical micelle concentration) value of the surfactants depends both on the size of the hydrophobic chain (tail) and size of the hydrophilic domain (head). The two contributions are counteracting with a lower CMC for a larger hydrophobic chain and a higher hydrophilic domain.
Toluic acid on reaction with Br₂ + Fe gives
Which of the following sets of phenomenon shown by the radiations proves the dual nature of radiations
In the reaction
Cl2+OH− → Cl− + ClO4− + H2O,chlorineis
The compounds used as refrigerant are :
Which of the following are the examples of aldol condensation ?
Which statement(s) about cathode rays is/are correct?