Inorganic Chemistry Answers

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.

Why does sodium chloride not conduct electricity in its solid form?

A. Ions in its structure are in fixed positions

B. It contains no free electrons

C. It has a giant covalent molecular structure.

D. Ions in its structure only have single negative and single positive charges.

Magnesium is in group 2 in the periodic table. Which of the following formulas for magnesium compounds is correct?

A. MgO₂

B. MgS₂

C. MgF₂

D. Mg₂O

Lithium atom has two naturally occuring isotopes 26Li and 27Li. Given that the relative molecular mass of Lithium is 6.94. What is the abundance of these isotopes?

The lattice energy of MgO is greater than that of MgS because

A. MgO is ionic while MgS is covalent

B. MgO is solid while MgS is gas

C. The charge density of S is greater than that of O

D. The O2- ion is smaller that the S2- ion

What is the mass of Al2(SO4)3 needed to prepare 40 (p3)ml of (0.2p2)M of sulphate ions in aluminum sulphate solution? where p= log(moles of Al2(SO4)3 ?