The energy of an orbit in a hydrogen atom is given by the relation
E = -(Constant/n2) kJ mol-1.
Which of the following properties represents the constant in the above relation?
A light greenish coloured salt was soluble in water. On passing H₂S into the solution, a black ppt. was obtained which dissolved readily in HCl. The metal ion present is
The state of hybridisation of boron and oxygen atoms in boric acid molecule (H₃BO₃) are respectively
If bond enthalpies of H-H,Br-Br and H-Br bonds are 433 ,192 and 364 KJ mol-1 respectively ,The ∆Ho for the reaction H₂(g) + Br₂(g) →2HBr(g) is
The paramagnetic cation is
3.2 g of oxygen (At wt. = 16) and 0.2 g of hydrogen (At. wt. = 1) are placed in a 1.12 litre flask at 0oC. The total pressure of the gas mixture will be
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): According to VSEPR theory, there shall be minimum repulsions among lone pairs and bond pairs present in a molecule or ion.
Reason(R): I3- , has a linear structure.
The hydrocarbon which can react with sodium in liquid ammonia is
Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid . The product so obtained is diazotised and then heated with cuprous bromide. Thr reaction mixture so formed contains
The half-life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2 = 0.301).
The IUPAC name of the compound
Which are ionic compounds?
The reagents , NH4Cl and aqueous NH3 will precipitate :
The correct statement(s) concerning the structures E, F and G is (are)
Which of the following alloys contain(s) Cu and Zn ?
Identify the correct statement of the followings?