Inorganic Chemistry Answers

A mixture, weighing 6.000 grams, contains 41.50 % Na3PO4 and 58.50 % BaCl2 of the mixture, by weight. When dissolved in water, a precipitate forms via the double displacement reaction:

BaCl2(aq) + Na3PO4(aq) NaCl(aq) + Ba3(PO4)2(s)

If the reaction is quantitative, the yield of the solid barium phosphate should be

A flow or 1.2 MGD is to be treated with 18 percent solution of hydrofluosilicic acid. the water to be treated contains no fluorid and the desired fluoride concentration is 1.4 mg/L. assume the hydrogluosilicic acid weighs 9.5 pounds per gallon and 79.2 percent fluoride purity of the acid. What is the hydrofluosilicic acid feed rate in gallons per day?

The common Eastern mole, a mammal, typically has a mass of 78 g, which corresponds to about 7.8 moles of atoms. (A mole of atoms is 6.02 × 10^23 atoms. In atomic mass units (u), what is the average mass of atoms in the common Eastern mole?

How many types of sulphides are formed when alkali metals react with sulphur?
2
3
4
5
4 The attractive force which binds a hydrogen atom of one molecule with an electronegative atom of another molecule of the same compound is called __________.
nuclear bond
electromagnetic force
hydrogen bond
covalent bond
5 Ionization energy _____________ down the group within the alkali metals.
increases
has no fixed pattern
remains const

All common cations are smaller than all common anions except for one of these.
Calcium cations
Magnesium cations
Sodium cations
Rubidium cations

Decrease in hydration energy makes a compound __________.
electropositive
electronegative
insoluble
soluble

_________is the tendency of an atom to attract towards itself the shared electron pair of a bond in which it is involved.
electron affinity
electronegativity
atomic attraction
bonding
18 Which of these periods on the periodic table has only eight elements?
1
3
5
7
19 Which of these scientists attempted to classify elements into periods?
De Chancourtois and Dobereiner
Gibbs and Dobereiner
De Chancourtois and Le Chatiler
Graham and Dalton
20 The ionization energy of alkaline earth metals __________ on moving down the group.
increases
remains constant
multiplies
decreases

Electron affinity can be affected by all but one of the following. __________
effective nuclear charge
atomic radius
mass number
electronic configuration
14 High electron affinity means that the electron affinity is ____________.
large and positive
large and negative
small and positive
small and negative
15 Who arranged elements in order of increasing atomic weight on a line which spiraled around a cylinder from bottom to top?
John Newlands
Meyer
De Chancourtois
Mendeleev
16 In the Coulomb's law, "r" stands for _________.
covalent radius
effective nuclear charge
electronic charge
ionic radius

Who used the Law of the Octave to arrange atoms?
John Newlands
Meyer
De Chancourtois
Dobereiner
10 In the mordern form of Mendeleev peroidic table, elements are arranged in __________ horizontal rows.
6
7
8
9
11 According to __________, an orbital can have at the most two electrons of opposite spin.
Aufbau principle
Henry's law
Hund's rule
Exclusion principle
12 ____________ is defined as the energy released or absorbed when an electron is added to the gaseous atom in its ground state.
Electron affinity
Electronegativity
Ionization potential
Hydration energy

Arrangement of the elements in order of their increasing atomic numbers removes most of the anomalies of the _________.
Modern periodic law
De Chancourtois periodic table
Mendeleev's periodic table.
Ancient peroidic law
4 ____________is the enthalpy change when one mole of crystal lattice is formed from the isolated gaseous ions.
hydration energy
lattice energy
ionisation energy
gaseous energy
5 _____states that as far as possible in a given atom in the ground state, electrons in the same sub shell will occupy different orbitals and will have parallel spins.
Pauli's exclusion principle
Hund's rule
Gay Lussac's law
Aufbau's principle
6 As the principal quantum number increases, the atomic radius generally ___________.
shrinks
decreases
remains constant
increases
7 What property was used by Mendeleev to classify elements?
atomic number
molar mass
mass number
chemical properties
8 "The properties of elements are periodic functions of their atomic numbers". This is the statement of __________.
Lecoq de Biosbaudr