Inorganic Chemistry Answers

boron occurs in nature in the form of two isotopes having atomic mass 10 and 11. what are the precentage abundances of two isotopes in a sample of boron haqving atomic mass 10.8

The pH at 25⁰C of a mixture of 20 ml hydrochloric acid (pH₁=2) with 30 mL of the same acid (pH₂=3) is:

A. 5

B. 2.5

C. 1

D. 2.3

ALuminum sulphide is produced from a reaction of the elements Al and S according to the reaction 2Al_(s) + 3S_(g)  → Al₂S₃ . Given that the mass of aluminum is defined by a function m_A such that t(m_Al) = [ m_Al 4.1

41/10 m_Al ] and that t( m_Al ) is a singular matrix. The mass of sulfur that reacted was equivalent to the P^OH of 3.981 x 10^-7M solution of a base. What is the mass of the product formed?

A. 10.41g B. 102.6g C. 25.2g D. 40.5g

Radioactive decay involves the emission of n aplha particles and m beta particles. Given that the decay process involves the reaction ₇¹⁴N  → n₂⁴He +m₀^-1β + _n1ⁿ²X. Given that the values of n₁,n₂ , n and m are calculated theoretically such that n₁ - m(d/dy (1/y)) = 7 where y=-1.

A. n₂ = 14-n

B. n₁ = 7

C. n₂ =14-3n

D. m=2n

E. n₁ = 7-2m + n

The electronic configuration of an atom's valence shell is ns²np². During the titration of a CuCl₂ with conc. H₂SO₄(0.1M) acid and a suitable indicator was used such that P^H(y) of the HCl was 1.500. What is the period to which the element belongs with respect to the fact that y= -log(10+10^n/2)

Quantum numbers are always in the order n,l,m_l, m_s. Which of the following quantum numbers is likely NOT to occur and why?

A. 0,2,3,4 because the principal quantum number belongs to natural numbers

B. 2,1,-2,+1/2 because the spin quantum number ranges from -l to l

C. 3,2,1,-1/2/ beacuse the magnetic quantum number is always negative

D.4,3,-4,+-1/2 because the azimuthal quantum number is always a fraction.