Ncert Solutions Chemistry Class 11th

Choose the correct order of density of the alkali meals:

Which of the following sets of quantum numbers is not allowed?

SO₂Cl₂ on reaction with excess of water results into acidic mixture

SO₂Cl₂ + H₂O ® H₂SO₄ + 2HCl

16 moles of NaOH is required for the complete neutralization of the resultant acidic mixture. The number of moles of SO₂Cl₂ used is:

Identify the correct statement from B₂H₆ from those given below :

(A) In B₂H₆, all B-H bonds are equivalent

B) In B₂H₆, there are four 3-centre 2- electron bonds

C) B₂H₆ is a Lewis acid

(D) B₂H₆ can be synthesized from both BF₃ and NaBH₄.

(E) B₂H₆ is planar molecule.

  Choose the most appropriate answer from the options given below

Which of the following statements are correct?

(A) Both LiCl and MgCl₂ are soluble in ethanol

(B) The oxides Li₂O and MgO combine with excess of oxygen to give superoxide.

(C) LiF is less soluble in water than other alkali metal fluorides.

(D) Li₂O is more soluble in water than other alkali metal oxides.

Choose the most appropriate answer from the options given below :

Match List – I with List – II:

              List – I                      List – II

          (A) Sphalerite                (I) FeCO₃

          (B) Calamine                 (II) PbS

          (C) Galena                     (III) ZnCO₃

          (D) Siderite                    (IV) ZnS

 Choose the most appropriate answer from the options given below :

Given below are the oxides :

Na₂O, As₂O₃, N₂O, NO and Cl₂O₇

Number of amphoteric oxides is :

At $25°C$  and 1 atm pressure, the enthalpies of combustion are as given below:

The enthalpy of formation of ethane is

In a compound AOH, electronegativity of ‘ A’ is 2.1, the compound would be

Among the following oxides Cr₂O₃, V₂O₅, FeO, Mn₂O₇, ZnO, Cu₂O, MnO₂, CrO₃, NiO

If x = number of basic oxides

y = number of acidic oxides

z = number of amphoteric oxides

then the value of $\frac{\left(x+y\right)}{z}$  is