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 643 of 686
- A. CHCl=CCl2 and CH2=CH
- B. CHCl=CH2 and CH2=CHCl
- C. CH3CH=CHCH3 and H3CCH=CHCH3
- D. CH3CH3 and CH2=CH
Explanation: For geometric isomers, the basic conditions are Alternative groups are present in our carbons atoms There should be a carbon-carbon double…
Correct answer: CH3CH=CHCH3 and H3CCH=CHCH3- A. Chain isomerism
- B. Position isomerism
- C. Cis-Trans isomerism
- D. Optical isomerism
Explanation: In chain isomerism, the molecular formula of the isomers is same but they differ in the carbon chain or carbon skeleton.
Correct answer: Chain isomerism- A. 5
- B. 3
- C. 4
- D. 2
Explanation: Butane is an alkane with four carbon atoms so the molecular formula is C4H10. It has two isomers; n-butane and isobutane.
Correct answer: 2- A. C2H4
- B. C2H2Cl4
- C. C2H2Br2
- D. C2HCl3
Explanation: For cis-trans isomerism, the rotation must be restricted in the molecule (so, cannot occur in compounds that only have C-C single bonds)…
Correct answer: C2H2Br2- A. Graham's
- B. Charles's
- C. Boyle's
- D. None of these
Explanation: Effusion refers to the movement of gas particles through a small hole. Graham's Law states that the effusion rate of a gas is inversely…
Correct answer: Graham's- A. 30
- B. 99
- C. 50
- D. 80
Explanation: Explanation:The plasma is in four states of matter. It consists of neutral particles, positive ions, and negative electrons.
Correct answer: 9912847. The root mean square velocity of gases is inversely proportional to the square root of their:
- A. Molar mass
- B. Temperature
- C. Pressure
- D. Volume
Explanation: A is correct as r.m.s velocity of gases is inversely proportional to the square root of their molar masses.B is incorrect as r.m.s…
Correct answer: Molar mass- A. Ions and electrons
- B. Electrons and neutral atoms
- C. Electrons, ions and neutral atoms
- D. Ions and neutral atoms
Explanation: A is incorrect as plasma is composed of ions,electrons and neutrals atoms.B is incorrect as plasma is composed of ions,electrons and…
Correct answer: Electrons, ions and neutral atoms- A. Neon
- B. Nitrogen
- C. Oxygen
- D. Fluorine
Explanation: Molar Mass: Approximately 20.18 g/mol.Density: Neon is a noble gas with a low molar mass, resulting in a low density compared to the other…
Correct answer: Neon- A. Number of neutrons
- B. Size of cations
- C. Size of atomic radii
- D. Number of electrons
Explanation: Explanation:As cation radius increases, charge density decreases, thus heat of hydration decreases.This option is not correct because the…
Correct answer: Size of cations- A. (CH3-COOH)= 0.333 mol.dm-3(CH3-CH2-OH) = 1.333mol.dm-3(CH3-CH2-O-CO-CH3)= 1.666 mol.dm-3(H2O)= 1.666 mol.dm-3
- B. (CH3-COOH)= 1.333 mol.dm-3(CH3-CH2-OH) = 0.333mol.dm-3(CH3-CH2-O-CO-CH3)= 0.666 mol.dm-3(H2O)= 0.666 mol.dm-3
- C. (CH3-COOH)= 0.666 mol.dm-3(CH3-CH2-OH) = 0.666 mol.dm-3(CH3-CH2-O-CO-CH3)= 1.333 mol.dm-3(H2O)= 1.333 mol.dm-3
- D. (CH3-COOH)= 0.333 mol.dm-3(CH3-CH2-OH) = 0.333mol.dm-3(CH3-CH2-O-CO-CH3)= 1.333 mol.dm-3(H2O)= 1.333 mol.dm-3
Explanation: Change in concentration of of CH3COOH is 1-0.33 = 0.66 mol.dm-3Change in concentration of of CH3CH2OH is also 1-0.33 = 0.66 mol.dm-3Where…
Correct answer: (CH3-COOH)= 0.666 mol.dm-3(CH3-CH2-OH) = 0.666 mol.dm-3(CH3-CH2-O-CO-CH3)= 1.333 mol.dm-3(H2O)= 1.333 mol.dm-3- A. 10 moles.
- B. 8 moles.
- C. 6 moles.
- D. 4 moles.
Explanation: Balance chemical equation2H2 + O2 -> 2H20Now we will compare the moles of H2 and O2 with water from the balanced chemical equation.H2…
Correct answer: 10 moles.- A. Is mostly a cheaper substance and taken in larger quantity
- B. Is consumed earlier and controls the amount of product formed in a chemical reaction
- C. Gives greatest number of moles of products
- D. Is left behind after the completion of reaction
Explanation: Explanation: A limiting reactant is the one which is consumed earlier and controls the amount of product formed in a chemical reaction.
Correct answer: Is consumed earlier and controls the amount of product formed in a chemical reaction- A. Mass-mass relationship
- B. Mass-mole relationship
- C. Mole-volume relationship
- D. Mass-volume relationship
Explanation: A is incorrect as mass-mass relationship involves converting the mass of a reactant to moles of reactant, then using mole ratios to…
Correct answer: Mass-volume relationship- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: D is correct as Avogadros law states - Equal volume of all ideal gases at equal temperature contain equal number of moles
Correct answer: Option D- A. 6.67 x 10^-14
- B. 1.5 x 10^-14
- C. 6.67 x 10^14
- D. 1.5 x 10^14
Explanation: As we have to distribute 5 rupee coins to 100 people so,100/5 =20 coinsNow multiply these coins by the total population alive in…
Correct answer: 6.67 x 10^-14- A. 4g of O2
- B. 4.5g of H2O
- C. 4g of Cl2
- D. 1 moles of NaCl
Explanation: First, we need to calculate the number of moles of CO2 in 11g of CO2 So, 44g of CO2 is 1 mole, then 11g of CO2 is how many moles?
Correct answer: 4.5g of H2O- A. CH2O
- B. C4H12O2
- C. C2H6O
- D. CH4O
Explanation: Convert g CO2 to g C.Convert g H2O to g H.g O = total g - g C - g Hg C = g CO2 x (C/CO2) = 1.039 x 12.01/44.01 = approx 0.2833g g H = g…
Correct answer: C2H6O12859. One a. m .u stands for
- A. An atom of C - 12
- B. 1/12th of a carbon
- C. 1/12th of H
- D. 1 atom of all the elements
Explanation: The atomic mass unit (amu) is a unit of mass used to express the mass of atomic and subatomic particles.
Correct answer: 1/12th of a carbon- A. Mass of an element
- B. Empirical formula mass
- C. Molar mass of an element
- D. Formula mass
Explanation: Since molar mass is constant for a given element, increasing the mass increases the number of moles proportionally.
Correct answer: Mass of an element