All Free Chemistry MCQs with Answers
Every Chemistry question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
13,720 questions · page 668 of 686
- A. Position isomerism
- B. Functional group isomerism
- C. Chain isomerism
- D. All of above
Explanation: Position isomerism: C2H11OH, which represents a molecule with two carbon atoms, exhibits position isomerism.
Correct answer: Position isomerism- A. CH3OH
- B. C2H5OCH3
- C. CH3OCH3
- D. C2H5OC2H5
Explanation: CH3OCH3 is an isomer of ethanol. It is called dimethyl ether, which has the same molecular formula as ethanol but a different structural…
Correct answer: CH3OCH3- A. Chain isomerism
- B. Structural isomerism
- C. Geometrical isomerism
- D. Position isomerism
Explanation: Geometric isomers possess the same structural formula containing a double bond and differ only in respect of the arrangements about the…
Correct answer: Geometrical isomerism- A. Chain isomers
- B. Position isomers
- C. Functional group isomers
- D. Both (A) and (B)
Explanation: Functional group isomers differ in the functional groups within their structures, leading to distinct chemical reactions and variations in…
Correct answer: Functional group isomers- A. Conformational isomers
- B. Metamers
- C. Geometrical isomers
- D. Enantiomers
Explanation: Metamers are the compounds having the same molecular formula but different position of atoms or groups on the either side of bridging…
Correct answer: Metamers- A. Structural
- B. Optical
- C. Stereo
- D. None of the above
Explanation: Stereoisomers are isomers that have the same composition (that is, the same parts) but that differ in the orientation of those parts in…
Correct answer: Stereo- A. 2
- B. 4
- C. 5
- D. 3
Explanation: Pentane (C5H12) is an organic compound with five carbon atoms. Pentane has three isomers that are n-pentane, Iso-pentane (methyl butane)…
Correct answer: 3- A. Metamerism
- B. Optical isomerism
- C. Tautomerism
- D. None
Explanation: It gives metamerism which is when compounds having the same molecular formula but different alkyl groups on either side of functional…
Correct answer: Metamerism- A. 2
- B. 4
- C. 8
- D. 5
Explanation: For the chemical formula C2H6O, which represents an alcohol (ethanol), there are 8 isomeric structures possible.
Correct answer: 8- A. rNH3 /rCO2 =1/1.6
- B. rNH3 /rCO2 =1.6/1
- C. rCO2 /rNH3 = 1/1.6
- D. None of these
Explanation: In this question, we don't have to apply Grahm's law cuz it is far simple What they said, rNH3=1.6(rCO2) ,the questions word in equation…
Correct answer: rNH3 /rCO2 =1.6/1- A. Helium
- B. Hydrogen
- C. Nitrogen
- D. Neon
Explanation: This concept is related to the process of effusion.Effusion is the process in which a gas escapes from a container through a hole of a…
Correct answer: Hydrogen- A. diffusion
- B. viscosity
- C. density
- D. none of the above
Explanation: Diffusion is the net movement of gases from a region of higher concentration to a region of lower concentration.
Correct answer: diffusion- A. at the center of the tube
- B. near the NH3 bottle
- C. near the HCl bottle
- D. throughout the length of the same tube
Explanation: When connecting the two bottles, the two gases will diffuse into each other.The rate of diffusion is inversely proportional to the square…
Correct answer: near the HCl bottle- A. H
- B. He
- C. Ne
- D. Xe
Explanation: Hydrogen is the only gas listed that is diatomic, meaning its molecules consist of two atoms (H2).
Correct answer: H- A. 8.0 ms-1
- B. 6.0 ms-1
- C. 5.0 ms-1
- D. 7.0 ms-1
Explanation: To find the root-mean-square (RMS) speed of the gas molecules, use the formula:Vrms = √((v1^2 + v2^2 + v3^2 + v4^2) / total number of…
Correct answer: 8.0 ms-1- A. The plasma contains an equal amount of positive and negative charges and is almost neutral as a whole.
- B. Plasma exists in the atmosphere of stars.
- C. Plasma exists in the region around the sun.
- D. There is less matter in the plasma state than in the solid, liquid, and gaseous states.
Explanation: Plasma is the highest energy state of matter. It consists of a collection of free-moving electrons, positive ions and neutral particles.
Correct answer: There is less matter in the plasma state than in the solid, liquid, and gaseous states.- A. The average kinetic energy of the molecules depends on the volume in which the gas is enclosed.
- B. The average kinetic energy of the molecules in the gaseous state is proportional to the pressure.
- C. The average kinetic energy of the molecules in the gaseous state is proportional to the temperature.
- D. All of the above
Explanation: Kinetic energy is the energy a substance has because of its molecules being in motion, as a substance absorbs heat its molecules move…
Correct answer: The average kinetic energy of the molecules in the gaseous state is proportional to the temperature.- A. Hydrogen, 4O2
- B. Hydrogen, 2O2
- C. Oxygen, 8H2
- D. Oxygen, 3H2
Explanation: The balanced chemical equation for the reaction between oxygen gas and hydrogen gas is:O2 + 4H2 → 2H2OAccording to this equation, for…
Correct answer: Hydrogen, 2O2- A. 50 amu
- B. 25 amu
- C. 16 amu
- D. 8 amu
Explanation: Graham found experimentally that the rate of diffusion of a gas is inversely proportional to the square root of the mass of its particles.
Correct answer: 8 amu- A. one mole of gaseous ions is dissolved in one mole of water
- B. one mole of ions in solid state is dissolved in one mole of water.
- C. one mole of gaseous ions is dissolved in water to give infinitely dilute solution
- D. one mole of ions in solid state is dissolved to form concentrated solution
Explanation: Hydration energy is defined as 'the energy released when one mole of gaseous ions dissolves in water to give an infinitely dilute…
Correct answer: one mole of gaseous ions is dissolved in water to give infinitely dilute solution