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WorksheetsChemistry Mart Sem 1 Set B
Total questions: 10
Worksheet time: 5mins
The mass percent concentration of a solute in a solution is defined as
Grams of solute in 100 g solvent
Grams of solute in 100 g solution
Grams of solute in 100 ml solution
Grams of solute in 100 kg solvent
The Bohr theory explains that an emission spectral line is due to
an interaction between electrons in atoms
an electron gaining energy and changing orbit
an electron losing energy and changing orbit
an electron losing energy but keeping the same value of its four quantum number
Which if the following trends occurs to the elements across the third period from sodium to chlorine in the periodic table?
Size of atoms increases
Electronegativity decreases
The outer electrons are held more weakly
Forces of attraction between electron and nucleus increase
Elements that has two single electrons and two pairs in its Lewis symbol
Carbon
Nitrogen
Oxygen
Flourine
Which of the following statement is TRUE for gases?
The volume of a gas is directly proportional to the pressure
The pressure of a gas is inversely proportional to its temperature
The number of moles of a gas is directly proportional to the gas constant
For a fixed mass of gas at a constant temperature, the volume of gas is inversely proportional to the pressure
Which of the following is an example of a crystalline solid?
CsCl
N2
NH3
O3
Calculate the pH of a 0.02 M solution of Ca(OH)2 at 25oc
0.04
1.40
1.69
12.6
Choose the CORRECT statement regarding buffer solutions
A buffer capacity is the pH of a buffer after mixing an acid and base pair in limited amount
A buffer made from strong acid and strong base is normally able to resist changes in pH better
A buffer solution made from NH3 and NH4Cl pair will have pH in the acid range
A buffer is characterized by its pH, and its buffer capacity upon the addition of small amounts of strong acid or strong base
Which one of the following statements describes the metallic bonding?
Metallic solid consist of cations
Valence shell of atoms involved in the formation of metallic bond overlap to form negatively charged sea
The strength of metallic bond declines with increasing number of electron involved
Choose the ALL correct statement(s) when the following mixture is compressed.
2Cl2(g) + 2H2O(g) ⇌ 4HCl(g) + O2(g)
Less HCl formed
The rate of the reverse reaction increases
The value of the equilibrium constant will decrease
