Chemistry problems
- 1. Which of the following is not soluble in water?
Options- A. copper(II) hydroxide
- B. sodium chloride
- C. silver nitrate
- D. potassium sulfate Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: copper(II) hydroxide
Explanation:
Sodium chloride:
The solubility rules tell you that all halides are soluble with the exception of those formed with siver, mercury, and lead ions. Since this is not the case here, sodium chloride will be soluble.
Silver nitrate:
It is soluble because all nitrates are soluble, without exception.
Potassium sulfate:
It is soluble because all sulfates are soluble with the exception of those formed with silver, calcium, barium, mercury, lead, and strontium ions.
Copper (II) hydroxyde:
It is insoluble because all hydroxides are insoluble with the exception of those formed with alkali metal ions and barium.
- 2. An electrically charged atom or group of atoms is called
Options- A. An ion
- B. A meson
- C. A electron
- D. None of the above Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: An ion
Explanation:
An electrically charged atom or group of atoms formed by the loss or gain of one or more electrons is called an Ion.
Cation:
An ion is a cation (positive ion) if it is created by electron loss and is attracted to the cathode in electrolysis.
Anion:
An ion is an anion (negative ion) if it is created by an electron gain and is attracted to the anode.
The valence of an ion is equal to the number of electrons lost or gained and is indicated by a plus sign for cations and a minus sign for anions.
Ex: Na +, Cl?, Ca ++,...
- 3. Which of the following is not an allotrope of carbon?
Options- A. Diamond
- B. Graphene
- C. Ethylene
- D. Buckminsterfullerene Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: Ethylene
Explanation:
Allotropes are different structural modifications of an element, that is, each of two or more different physical forms in which an element can exist.
Carbon is capable of forming many allotropes due to its valency. Well-known forms of carbon include charcoal, diamond, graphite, buckminsterfullerene and graphene.
Hence, Ethylene is not an allotrope of Carbon.
- 4. Order of basicity of amines in gaseous state?
Options- A. 2'> 1'> 3' > NH3
- B. 3' > 2' > 1'> NH3
- C. 1' > 2' > 3'> NH3
- D. 2'> 3'> 1' > NH3 Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO, Database Administrator, IT Trainer
Correct Answer: 3' > 2' > 1'> NH3
Explanation:
The order of basicity in ammonia is different in gaseous phases vs. aqueous phases due to hydrogen bonding.
So in gaseous phases it's the well known: 3' > 2' > 1'> NH3. Just so we're on the same page, this is due to the inductive effect of electron donating alkyl groups--they destabilize the lone pair on nitrogen atom, making nitrogen more basic.
But in aqueous phase, the order is slightly different: 2'> 1'> 3' > NH3.
- 5. What is the gram formula mass of Li2SO4 ?
Options- A. 101.2487
- B. 109.9446
- C. 111.2687
- D. 106.5871 Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO, Database Administrator, IT Trainer
Correct Answer: 109.9446
Explanation:
The term gram formula mass is synonymous with molecular mass. So, to get this, we must add molar mass of all the elements in this compound.
Given compound is Lithium Sulphate -
Elemental calculation ::
Li - Lithium - 6.941 - 2 - 13.88200 %
S - Sulfur - 32.065 - 1 - 32.065 %
O - Oxygen - 15.9994 - 4 - 63.9976 %
Now, total = 12.6264 + 29.1647 + 58.2090 = 109.9446
Hence, the gram formula mass of Li2SO4 = 109.9446.
- 6. Rank these compounds by boiling point- Pentane, Propane and Hexane.
Options- A. Pentane > Propane > Hexane
- B. Propane > Pentane > Hexane
- C. Hexane > Pentane > Propane
- D. Propane > Hexane > Pentane Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: Hexane > Pentane > Propane
Explanation:
The boiling point of the compounds depend on the number of carbons in them. Hexane has 6, Pentane has 5 and Propane has 3 carbons. As Hexane is with 6 carbons it has highest boiling point and next Pentane with 5 and lowest Propane with 3.
- 7. What is the IUPAC name of [Co(NH3)4Cl2]?
Options- A. Tetra-ammine dichloro cobalt (III) chloride
- B. Tetra-ammine trichloro cobalt (III)
- C. Tri-ammine dichloro cobalt (III) chloride
- D. Tetra-ammine dichloro cobalt Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: Tetra-ammine dichloro cobalt (III) chloride
Explanation:
The IUPAC nomenclature in organic chemistry is a systematic method that is used to name organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry (IUPAC).
The IUPAC name of the given complex [Co (NH?)?Cl? ]Cl is - Tetra-ammine dichloro cobalt (III) chloride.
The complex [Co (NH?)? Cl? ] Cl ionizes an aqueous solution to furnish the chloride ion Cl? and [Co (NH?)? Cl? ] ?.
- 8. Which of the following statements about monosaccharide structure is true?
Options- A. Aldoses and ketoses differ in the position of their hydroxyl groups.
- B. Monosaccharides can be classified according to the spatial arrangement of their atoms.
- C. All monosaccharides contain carbon, hydrogen, oxygen, and nitrogen atoms.
- D. A six-carbon sugar is called a pentose. Also asked in: AIEEE, Bank Exams, CAT, Bank PO
Correct Answer: Monosaccharides can be classified according to the spatial arrangement of their atoms.
Explanation:
Monosaccharides, also called simple sugars, are the most basic units of carbohydrates. They are fundamental units of carbohydrates and cannot be further hydrolyzed to simpler compounds.
Hence, Monosaccharides can be classified according to the spatial arrangement of their atoms is true about Monosaccharides.
- 9. IUPAC full form
Options- A. Indian Union of Pure and Applied Chemistry
- B. International Union of Postal and Application Corporation
- C. International Union of Pure and Applied Chemistry
- D. International University of Poland And Combodia Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: International Union of Pure and Applied Chemistry
Explanation:
IUPAC stands for International Union of Pure and Applied Chemistry.
A chemical nomenclature is a set of rules to generate systematic names for chemical compounds. The nomenclature used most frequently worldwide is the one created and developed by the International Union of Pure and Applied Chemistry (IUPAC).
- 10. What is the gram formula mass of K2CO3 ?
Options- A. 147
- B. 138
- C. 129
- D. 116 Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: 138
Explanation:
The gram formula mass of a compound is nothing but the molar mass.
The molar mass of K2CO3 (Potassium Carbonate) is given by
Atomic weights of individual elements are
K (Potassium) = 39 g
C (Carbon) = 12 g
O (Oxygen) = 16 g
Hence, that of K2CO3 = 39(2) + 12 + 16(3)
= 78 + 12 + 48
= 138.
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