Agniveer Army Technical Applied Chemistry Questions

A catalyst is a substance that increases the rate of reaction by lowering the activation energy. Which of the following statements about catalysts is correct?

The complex [Ni(CO)₄] is diamagnetic. This indicates that nickel in this complex has:

The rate of a chemical reaction is defined as the change in concentration of a reactant or product per unit time. If the concentration of a reactant decreases from 0.8 M to 0.2 M in 3 seconds, what is the average rate of reaction?

The activation energy (Eₐ) of a reaction is the minimum energy required for reactants to form products. How does increasing the temperature of a reaction affect the number of collisions with energy ≥ Eₐ?

What is the coordination number of the central metal ion in the complex [Co(NH₃)₆]³⁺?

In the complex [CuCl₄]²⁻, what is the oxidation state of copper?

If 96,500 C of charge is passed through a CuSO₄ solution using copper electrodes, what mass of copper is deposited at the cathode? (Molar mass of Cu = 64 g/mol)

A solution contains 36 g of glucose (C₆H₁₂O₆) dissolved in 1000 g of water. Calculate the molality of the solution. (Molar mass of glucose = 180 g/mol)

What is the mole fraction of solute in a solution containing 46 g of ethanol (C₂H₅OH) dissolved in 72 g of water? (Molar mass: ethanol = 46 g/mol, water = 18 g/mol)

For a first-order reaction, the integrated rate law is given by ln[A] = ln[A]₀ - kt. If the half-life of a first-order reaction is 10 minutes, what will be the half-life if the initial concentration is doubled?

Which of the following is a colligative property of solutions?

For a zero-order reaction, the integrated rate law is [A] = [A]₀ - kt. If a zero-order reaction has a rate constant of 0.05 M/s and initial concentration of 2 M, how long will it take for the concentration to become zero?

A solution is prepared by dissolving 68 g of sucrose (C₁₂H₂₂O₁₁) in sufficient water to make 500 mL of solution. Calculate the molarity. (Molar mass of sucrose = 342 g/mol)

Which of the following ligands is classified as a bidentate ligand?

A 2.0 M solution of NaCl is prepared. What is the mass of NaCl required to prepare 500 mL of this solution? (Molar mass of NaCl = 58.5 g/mol)

In an electrochemical cell, which electrode is the site of oxidation?

What is the standard cell potential (E°cell) if E°cathode = +0.80 V and E°anode = −0.44 V?

Which of the following statements is true for a galvanic cell?

In the electrolysis of molten NaCl, the product formed at the cathode is:

What is the IUPAC name of the complex [Pt(NH₃)₄]²⁺?

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