QUIZ
Anomalous Behaviour of Beryllium
2 minutes ago by
37 questions
Q. Which of the element of group 2 the correct one when down group?
answer choices
Be, Mg, Ca, Sr, Ba
Ba, Mg, Ca, Sr, Be
Ba, Ca, Mg, Sr, Be
Be, Ca, Mg, Sr, Ba
Q. Beryllium compounds tends to form ______ compouds rather than ________compounds.
answer choices
covalent, ionic
ionic, covalent
covalent, metallic
ionic, metallic
Q. Which one covalent compound?
answer choices
BeBr2
MgO
CaF2
SrSO4
Q. Which one covalent compound?
answer choices
BeCl2
MgCl2
CaCl2
SrCl2
BaCl2
Q. Amphoteric hydroxides react with...
answer choices
both alkalines and acids
alkalines only
acids only
Q. Amphoteric, can dissolve (react) in...
answer choices
NaOH & HCl
NaOH only
HCl only
Q. BeO is an ______ oxide of group 2 while other elements of group 2 forms ______ oxide.
answer choices
amphoteric, basic
amphoteric, acidic
acidic, amphoteric
basic, amphoteric
Q. BeO =
answer choices
covalent character & amphoteric
ionic character & basidic
ionic character & amphoteric
covalent character & acidic
Q. Which one forms amphoteric compound?
answer choices
BeO
MgO
CaO
SrO
BaO
Q. BeO, beryllium oxide, has _____ melting point than MgO because __________
answer choices
lower, the compound form has covalent molecule nature not ionic.
lower, the compound form has ionic molecule nature not covalent.
higher, the compound form has covalent molecule nature not ionic.
higher, the compound form has ionic molecule nature not covalent.
Q. The melting point and boiling points of group 2 (overall) are ______ when compared to the other elements of the group.
answer choices
higher
lower
almost same
slightly different
Q. BeCl2 =dissolve in water, hydrolysis in water to produce ______ solution, ____ ions, acidic pH __ 7.
answer choices
acidic, H3O+, <
basidic, OH-, >
acidic, OH-, <
basidic, H3O+, >
Q. Which one has lowest pH (acidic) when dissolve in water? NaCl, KCl, BeCl2, MgCl2.
answer choices
BeCl2
MgCl2
NaCl
KCl
Q. What happens with NaCl when dissolve in water?
answer choices
neutral solution
acidic
weak acid
Q. What happens with KCl when dissolve in water?
answer choices
neutral solution
acidic
weak acid
Q. What happens with BeCl2 when dissolve in water?
answer choices
acidic
weak acid
neutral solution
Q. What happens with MgCl2 when dissolve in water?
answer choices
weak acid
acidic
neutral solution
Q. BeCl2 = can form dimer because ______________ .
answer choices
Be2+ has high charge density
it forms a covalent compouds
it forms an amphoteric compounds
it has lower melting point
it can form complex ions
Q. Beryllium act as a strong ________ agent
answer choices
reducing
oxiding
Q. Be2+ + 2e− ⇌ Be(s), Standard reduction potential, E° (V) = _____
answer choices
–1.99
-2.36
-2.87
-2.91
Q. Beryllium, Be can form complex ions because ________
answer choices
Be2+ has high charge density
it forms a covalent compouds
it forms an amphoteric compounds
it has lower melting point
it can form complex ions
Q. Can form dimer, Be2Cl4, because Be atom has a/ an ________ octet, the lone pair from the ______ atom utilised to form dative bond with _______.
answer choices
incomplete, Cl, Be.
complete, Cl, Be.
complete, Be, Cl.
incomplete, Be, Cl.
Q. A complex ion is a cation bonded to small molecules called _______ by ________.
answer choices
ligands, dative bonds.
dative bonds, ligands.
Q. A dative bond is....
answer choices
a covalent bond between two atoms where one of the atoms provides both electrons that form the bond.
an ionic bond between two atoms where one of the atoms provides both electrons that form the bond.
a covalent bond between two atoms where one of the atoms provides one electrons that form the bond.
a ionic bond between two atoms where one of the atoms provides one electrons that form the bond.
Q. Beryllium, Be _____ in benzene (inorganic solvent), other element in group 2 ______. Example, BeCl2 ______ in benzene.
answer choices
soluble, insoluble, dissolve
insoluble, soluble, dissolve
soluble, insoluble, cannot dissolve
insoluble, soluble, cannot dissolve
Q. Electronegativity is basically a chemical property that describes how an atom can ________ with an electron in very well way. Values that electronegativity run from _______. As we all know electronegativity is used to assume the bonding between atoms and also see that they are ________, we can also predict that the result of molecules will be _______.
answer choices
attract, 0 to 4, ionic or covalent, polar or non-polar
repulsions, 0 to 4, polar or non-polar, ionic or covalent
attract, 0 to 4, polar or non-polar, ionic or covalent
Q. Be, beryllium's valence electron is very ______ to nucleus. Be, beryllium more ________, ________, its electron _____ to be released during reactions.
answer choices
near, electronegative, less reactive, hard
far, electropositive, more reactive, easy
far, electronegative, less reactive, hard
near, electropositive, less reactive, hard
Q. Reaction of elements group 2 with water:<br />Be = _______
answer choices
no reaction
hot steam
cold water
normal water
Q. Reaction of elements group 2 with water:<br />Mg = ______
answer choices
hot steam
no reaction
cold water
normal water
Q. Reaction of elements group 2 with water:<br />Ca = ______
answer choices
normal water
hot steam
cold water
no reaction
Q. Reaction of elements group 2 with water:<br />Sr = _______
answer choices
cold water
hot steam
no reaction
normal water
Q. Reaction of elements group 2 with water:<br />Ba = _______
answer choices
cold water
hot steam
no reaction
normal water
Q. Down to group 2, from Beryllium to Barium, reactivity _______.
answer choices
increases
decreases
almost same
slightly different
Q. Reactivity _________from Be to Ba, when down group 2. Because atomic radius and shielding effect increases.
answer choices
increases
decreases
Q. Reactivity increases from Be to Ba, when down group 2 because ....
answer choices
Valence electrons further from nucleus, the large shielding effect, weaker the nuclear pull towards the electrons, easier for metal to lose electrons.
Valence electrons near from nucleus, the small shielding effect, stronger the nuclear pull towards the electrons, hard for metal to lose electrons.
Q. Melting point of:<br />BeCl2 = 399'C<br />BaCl2 = 962'C<br />Why?
answer choices
BeCl2, simple molecular structure molecules held by weak van der Waals forces.
BeCl2, giant ionic structure, ions held by strong ionic bonds.
BaCl2, simple molecular structure molecules held by weak van der Waals forces.
Q. Beryllium shows diagonal relationship with __________. Chemical properties of Be is similar to ______ which can form complex ions and ______ compound.
answer choices
aluminium, Al3+, amphoteric
aluminium, Al3+, basidic
magnesium, Mg2+, acidic
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