All Free Chemistry MCQs with Answers

• A. To prevent waste creation
• B. To maximize the atom economy
• C. To create less hazardous synthetic chemical
• D. All of the above

Explanation: The basic principles of green chemistry encompass all the options listed: A.

• A. Very difficult step
• B. Highly unstable product
• C. Highly endothermic
• D. None of the above

Explanation: The Haber process involves the synthesis of ammonia (NH3) from nitrogen (N2) and hydrogen (H2) gases.

• A. First law of thermodynamics
• B. Henery's law
• C. Hess's law
• D. Joule's law

Explanation: Option A: The first law of thermodynamics states that energy can neither be created nor destroyed, only altered in form. Hence incorrect.

• A. sp
• B. sp2
• C. d2s
• D. p2

Explanation: Trick: See the number of electron clouds around the C atom (1 electron cloud= single bond/double bond/ triple bond).

• A. SP hybridized
• B. SP2 hybridized
• C. SP3 hybridized
• D. None of the above

Explanation: In a carbonyl, the carbon atom is double-bonded to an oxygen atom and single-bonded to another atom.

• A. PH3
• B. NH3
• C. SbH3
• D. C2H2

Explanation: Each carbon in C₂H₂ is sp hybridized, it forms two sigma bonds (one with H, one with C) and uses two unhybridized p orbitals for the π…

• A. C2H6
• B. C3H6
• C. C4H6
• D. C4H8

Explanation: The compound C4H6, also known as butadiene, has four carbon atoms and two double bonds. Each carbon atom is bonded to one hydrogen atom.

• A. sp2 hybridization
• B. sp hybridization
• C. sp3 hybridization
• D. dsp2 hybridization

Explanation: The correct hybridization for BeCl2 is sp, which occurs when there are two electron domains around the central atom.

• A. HC = CH
• B. H2C = CH2
• C. H2C = C= CH2
• D. CH2= CHCH3

Explanation: The C-C sigma bond in ethylene is formed by the overlap of an sp2 hybrid orbital from each carbon.

• A. 109.5
• B. 120
• C. 90
• D. 107.5

Explanation: Ethane, C2H6, has a geometry related to that of methane. The two carbons are bonded together, and each is bonded to three hydrogens.

• A. BF3
• B. H2O
• C. BeCl2
• D. NH3

Explanation: The correct answer is BeCl2. In BeCl2, beryllium undergoes sp hybridization, resulting in two sp hybrid orbitals that overlap with the p…

• A. Sp3, 109.5*
• B. Sp3, 60*
• C. Sp2, 120*
• D. Sp2, 107*

Explanation: Cyclopropane has carbons with four bonds, hence they are SP3, but with bond distances less than normal alkanes and C-C-C bond angles of 60…

• A. Sp2
• B. Sp
• C. Sp and Sp2
• D. Sp. Sp2. Sp3

Explanation: The first carbon atom has an sp hybridization, as it is involved in a triple bond with another carbon atom.The second and third carbon…

• A. Weak
• B. Strong
• C. Less energetic
• D. More stable

Explanation: According to the quantum mechanical approach, a covalent bond is formed when half-filled orbitals in the outer or valence shells of two…

• A. Trigonal planar
• B. Octahedral
• C. Square planar
• D. Tetrahedral

Explanation: The geometry of methyl chloride (CH3Cl) is tetrahedral. In CH3Cl, the central carbon atom (C) is bonded to four other atoms: three…

• A. H2O
• B. HCl
• C. CH3COOH
• D. CH3OCH3

Explanation: Due to the presence of methyl groups that bounds to oxygen there is less tendency of hydrogen bonding in ethers.Also, it does not have…

• A. PH3
• B. CH4
• C. NH3
• D. SiH4

Explanation: Hydrogen bonding occurs when hydrogen is bonded to a highly electronegative atom such as nitrogen, oxygen, or fluorine, which creates a…

• A. CH3
• B. CH3 OCH3
• C. CH3NH3
• D. C6 H5 OCH3

Explanation: Hydrogen bonding is possible when a hydrogen atom is bonded to another electronegative atom like O,F,N etc therefore the answer will be C.

• A. Hydrogen gas (H2)
• B. Proteins
• C. Carbohydrates
• D. Ammonia (NH3)

Explanation: Hydrogen bonding is an intermolecular force that occurs when a hydrogen atom is covalently bonded to a highly electronegative atom, such…

• A. CH3-O-CH3
• B. CH3 -CH2 -OH
• C. CH3 -CH2-NH2
• D. None of the above.

Explanation: Option B contains OH that can interact with the water to form a hydrogen bond with water.