Which of the following gives blood red colour with KCNS ?
(i) C + O₂ → CO₂ ; ∆Ho = − xkJ,
(ii) 2CO + O₂ → 2CO₂ ; ∆Ho = −ykJ .
The enthalpy of formation of carbon monoxide will be
In the electrochemical cell Pt, H2 (g) 1 atm ∕ H+(I M) ∕ Cu2+ (I M) ∕ Cu(s) . Which one of the following statements is true?
pH of the solution at 250C is 2. If the pH is to be doubled then the hydronium ion concentration of the solution should be
Given that Ka for acetic acid as 1.8x10⁻5 and Kb of NH₄OH as 1.8x10⁻5 at 25oC,predict the nature of aqueous solution of ammonium acetate
What among following is used to produce artificial rain ?
If 20 ml of 0.4 N NaOH solution completely neutralises 40 ml of a dibasic acid, the molarity of the acid solution is
N1V1 = N2V2
0.4 x 20 = N2 x 40
N2 = 0.4 x 20/40 = 0.2 N
Molarity = Normality x Eq wt of solute/Mol wt of solute
= Normality x 1/Basicity of acid
= 0.2 x 1/2 = 0.1 M
For n = 5, total number of electrons will be ___
Maximum number of electron in a shell
i.e., for n = 5
2 x 5 2 = 50 electrons.
The quantum number of most energetic electron in Ne atom when it is in first excited state is__
The electronic configuration of Ne atom is 1s2 2s2 2p6. In its first excitation state the electron from 2p level will unpair and shift to 3s where quantum number will be 3,0,0, 1/2
Since enthalpy of elements in their natural state is taken to the zero .The value of ∆Hf of compounds
If 2 x 10−24 gm and 3 x 10−24 gm are the masses of two atoms in a molecule, the reduced mass of the molecule is__
Among the following metal carbonyls, the C --- O bond order is lowest in :
The empirical formula of an acid is CH₂O₂, the probable molecular formula of the simplest acid may be