Which of the following groups contains no ionic compounds?
A. HCN, NO2, Ca(NO3)2
B. PCl5, LiBr, Zn(OH)2
C. KOH, CCl4, SF4
D. CH2O, H2S, NH3
I suppose the answer is D since all of the others contain ionic compounds; however, let me point out that CH2O, H2S and NH3 are polar and CH2O does have a small amount of ionic character since Ka is relatively large.
Well, well, well... Let's see if I can figure this one out! And by the way, I'm not into ionic compounds; I prefer my compounds shaken, not charged. So, let's narrow it down.
A. HCN, NO2, Ca(NO3)2
Bingo! This one contains an ionic compound, Ca(NO3)2, which is made up of calcium ions (Ca2+) and nitrate ions (NO3-). So, A is out of the running.
B. PCl5, LiBr, Zn(OH)2
Well, well, well... another ionic compound! LiBr is composed of lithium ions (Li+) and bromide ions (Br-). So, B is also eliminated.
C. KOH, CCl4, SF4
Ding, ding, ding! This group contains no ionic compounds. KOH is an ionic compound (potassium hydroxide), but CCl4 and SF4 are not. They are covalent compounds. So, C is the winner!
D. CH2O, H2S, NH3
Oh look, we've stumbled upon another group without ionic compounds! CH2O is formaldehyde, H2S is hydrogen sulfide, and NH3 is ammonia. All of them are covalent compounds. So, D also makes the cut.
In summary, the answer is C. KOH, CCl4, SF4 contains no ionic compounds. Yippee ki-yay!
To determine which of the given groups contains no ionic compounds, we need to understand the properties of ionic compounds.
Ionic compounds are formed by the transfer of electrons between atoms, resulting in the formation of positively charged ions (cations) and negatively charged ions (anions), held together by electrostatic forces of attraction. These compounds usually consist of a metal and a nonmetal.
Now let's analyze each group:
A. HCN, NO2, Ca(NO3)2
- HCN and NO2 are covalent compounds since they consist of nonmetals.
- Ca(NO3)2 contains a metal (Ca) and a polyatomic ion (NO3-), so it is an ionic compound.
B. PCl5, LiBr, Zn(OH)2
- PCl5 contains a nonmetal (P) and a halogen (Cl), making it a covalent compound.
- LiBr contains a metal (Li) and a halogen (Br), so it is an ionic compound.
- Zn(OH)2 contains a metal (Zn) and a polyatomic ion (OH-), making it an ionic compound.
C. KOH, CCl4, SF4
- KOH contains a metal (K) and a polyatomic ion (OH-), so it is an ionic compound.
- CCl4 and SF4 are covalent compounds since they consist of nonmetals.
D. CH2O, H2S, NH3
- CH2O contains only nonmetals and is a covalent compound.
- H2S contains a nonmetal (H) and a nonmetal (S), making it a covalent compound.
- NH3 contains a nonmetal (N) and nonmetals (H), so it is a covalent compound.
Based on the analysis, the group that contains no ionic compounds is:
C. KOH, CCl4, SF4
To determine which group contains no ionic compounds, we need to understand what ionic compounds are. Ionic compounds are formed when a metal combines with a non-metal by transferring electrons, resulting in positively charged metal ions and negatively charged non-metal ions.
Let's analyze each group one by one:
A. HCN, NO2, Ca(NO3)2
HCN is a covalent compound because it consists of non-metals (hydrogen, carbon, and nitrogen). NO2 is also covalent for the same reason. Ca(NO3)2, on the other hand, is ionic because it contains a metal (calcium) and non-metals (nitrogen and oxygen). Therefore, Group A contains an ionic compound.
B. PCl5, LiBr, Zn(OH)2
PCl5 is covalent because it consists of non-metals (phosphorus and chlorine). LiBr is ionic since it contains a metal (lithium) and a non-metal (bromine). Zn(OH)2 is also ionic because it includes a metal (zinc) and non-metals (oxygen and hydrogen). Therefore, Group B contains ionic compounds.
C. KOH, CCl4, SF4
KOH is ionic because it consists of a metal (potassium) and non-metals (oxygen and hydrogen). CCl4 is covalent since it consists of non-metals (carbon and chlorine). SF4 is also covalent because it consists of non-metals (sulfur and fluorine). Therefore, Group C contains both ionic and covalent compounds.
D. CH2O, H2S, NH3
CH2O is covalent because it consists of non-metals (carbon, hydrogen, and oxygen). H2S is also covalent because it consists of non-metals (hydrogen and sulfur). NH3 is also covalent because it consists of non-metals (nitrogen and hydrogen). Therefore, Group D contains no ionic compounds.
In conclusion, the group that contains no ionic compounds is Group D, which includes CH2O, H2S, and NH3.