Chemistry Mock Test | General Science | BPSC

Q1. Which type of RNA molecule is responsible for carrying the amino acid sequence information from the mRNA template to the ribosome during protein synthesis?

Small nuclear RNA (snRNA) Transfer RNA (tRNA) Ribosomal RNA (rRNA) MicroRNA (miRNA)

Q2. Which of the following is NOT a characteristic property of liquids?

Definite volume Definite shape Ability to flow Compressibility (though low)

Q3. When a gas is heated at constant volume, its temperature increases. According to the kinetic theory, this means the gas particles:

Move slower Move faster Become stationary Decrease in number

Q4. Which of the following substances will produce a basic solution when dissolved in water?

CO₂ SO₃ NO₂ NH₃

Q5. How many grams of CO2 are produced from the complete combustion of 12 grams of carbon (C + O2 -> CO2)?

22 grams 44 grams 12 grams 32 grams

Q6. For a reversible process, which statement is correct regarding entropy change?

ΔS > 0 ΔS < 0 ΔS = 0 ΔS can be positive or negative

Q7. According to the Ostwald dilution law, for a weak electrolyte, the degree of dissociation (α) is related to the concentration (C) and the dissociation constant (Kd) by the equation Kd = Cα²/ (1-α). For very dilute solutions, assuming α << 1, the law simplifies to:

Kd = Cα Kd = Cα² Kd = Cα / (1-α) Kd = C(1-α)/α

Q8. The complex [Pt(NH_3)_2Cl_2] exhibits geometrical isomerism. Which of the following statements is correct about these isomers?

The cis isomer is square planar and optically active. The trans isomer is square planar and optically inactive. The cis isomer is tetrahedral and optically active. The trans isomer is tetrahedral and optically inactive.

Q9. Consider the following reaction: R-X + NaCN -> R-CN + NaX. This reaction proceeds via which of the following mechanisms, particularly when R is a secondary alkyl halide and the solvent is polar aprotic?

SN1 SN2 E1 E2

Q10. What is the correct IUPAC name for the compound Ph-CO-CH3, where Ph represents a phenyl group?

Phenyl methyl ketone Acetophenone Benzoyl methyl ether Methyl phenyl ketone

Q11. What is the chemical symbol for hydrogen?

H He O N

Q12. An alpha particle is equivalent to:

An electron A proton A helium nucleus A neutron

Q13. The value of Kp for the reaction H2(g) + I2(g) <=> 2HI(g) is 54.3 at 430°C. If at equilibrium, the partial pressure of H2 is 0.02 atm and I2 is 0.03 atm, what is the partial pressure of HI?

0.07 atm 0.02 atm 0.04 atm 0.05 atm

Q14. A highly viscous liquid, such as honey, flows very slowly because:

Its molecules have very low kinetic energy. The intermolecular attractive forces are weak. There are strong frictional forces between adjacent layers of molecules moving at different speeds. It has a very low surface tension.

Q15. In a simple cubic crystal lattice, the atoms are located at:

Corners and face centers Corners and body center Corners only Face centers only

Q16. Which of the following has the highest melting point?

Sodium chloride Ice Diamond Potassium

Q17. The change in enthalpy (ΔH) of a system is defined as:

ΔU + PΔV ΔU - PΔV ΔU * PV ΔU / (PV)

Q18. What is the change in oxidation state of iodine in the reaction: I₂ + 2S₂O₃²⁻ → 2I⁻ + S₄O₆²⁻?

From 0 to -1 From -1 to 0 From 0 to +2 From 0 to +1

Q19. What is the main source of indoor air pollution?

Industrial emissions Vehicle exhaust Combustion of solid fuels (wood, coal) Natural gas leaks

Q20. Non-stoichiometric compounds are often formed due to:

Schottky defects Frenkel defects Metal excess or metal deficiency defects All of the above

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