4o
In an electrochemical series, standard electrode potentials are arranged on the basis of:
- A) pH scale
- B) pOH scale
- C) Hydrogen scale
- D) pKa scale
- Answer: C) Hydrogen scale
The reaction responsible for electricity production in a Voltaic cell is:
- A) Hydrolysis reaction
- B) Oxidation reaction
- C) Redox reaction
- D) Reduction reaction
- Answer: C) Redox reaction
- Glucose is converted into ethanol by the enzyme in yeast:
- A) Urease
- B) Invertase
- C) Sucrase
- D) Zymase
- Answer: D) Zymase
- The rate of reaction involving ions can be studied by the _ method:
- A) Dilatometric
- B) Refractometric
- C) Optical rotation
- D) Electrical conductivity
- Answer: D) Electrical conductivity
- When one mole of gaseous hydrogen ions are dissolved in water to form an infinitely dilute solution, the amount of heat liberated is:
- A) -1891 kJ/mol
- B) -1075 kJ/mol
- C) -499 kJ/mol
- D) -1562 kJ/mol
- Answer: C) -499 kJ/mol
- Energy required to remove an electron from the outermost shell of an isolated gaseous atom in the ground state is called:
- A) Electron affinity
- B) Lattice energy
- C) Ionization energy
- D) Crystal energy
- Answer: C) Ionization energy
- Which of the following alkali metal carbonates decomposes on heating to form an oxide and liberate CO₂?
- A) Li₂CO₃
- B) Mg₂CO₃
- C) K₂CO₃
- D) Na₂CO₃
- Answer: A) Li₂CO₃
- Calcium is essential for plants and stimulates the development of:
- A) Leaves
- B) Fruits
- C) Root hairs
- D) Branches
- Answer: C) Root hairs
- Which sulfate is not soluble in water?
- A) Sodium sulfate
- B) Barium sulfate
- C) Potassium sulfate
- D) Zinc sulfate
- Answer: B) Barium sulfate
- In Group III-A of the Periodic Table, the trend in element densities is:
- A) A gradual increase
- B) A gradual decrease
- C) First decreases, then increases
- D) First increases, then decreases
- Answer: A) A gradual increase
- White lead has one of the following properties:
- A) Acidic
- B) Crystalline
- C) Amorphous
- D) Neutral
- Answer: B) Crystalline
- The strongest acid among the following is:
- A) HF
- B) HI
- C) HCl
- D) HBr
- Answer: B) HI
- The noble gas used in cancer radiotherapy is:
- A) Radon
- B) Xenon
- C) Krypton
- D) Argon
- Answer: A) Radon
- In NH₄Cl, which type of bonding is present?
- A) Ionic
- B) Covalent
- C) Coordinate covalent
- D) All of these
- Answer: D) All of these
- In the electrolysis of CuSO₄ solution using copper electrodes, the substance deposited at the cathode is:
- A) Copper metal
- B) Copper ions
- C) Hydrogen
- D) Oxygen
- Answer: A) Copper metal
- Aldehydes can be synthesized by the oxidation of:
- A) Primary alcohols
- B) Secondary alcohols
- C) Organic acids
- D) Inorganic acids
- Answer: A) Primary alcohols
- The products of sugar fermentation are ethanol and:
- A) Water
- B) Oxygen
- C) Carbon dioxide
- D) Sulfur dioxide
- Answer: C) Carbon dioxide
- Which element forms long chains with oxygen?
- A) Carbon
- B) Silicon
- C) Nitrogen
- D) All of these
- Answer: B) Silicon
- The correct order of density for Group III-A elements is:
- A) Li < Na < K
- B) Al < Ga < In
- C) B < Ga < In
- D) In < Al < Ga
- Answer: C) B < Ga < In
- Hydrogen burns in chlorine to produce hydrogen chloride. The ratio of masses in this reaction is:
- A) 1:35.5
- B) 2:35.5
- C) 1:71
- D) 2:70
- Answer: A) 1:35.5
- The gas law which combines Charles’s and Boyle’s laws is:
- A) Avogadro’s Law
- B) Combined Gas Law
- C) Dalton’s Law
- D) Graham’s Law
- Answer: B) Combined Gas Law
- When sodium metal reacts with water, it produces hydrogen gas and:
- A) Sodium chloride
- B) Sodium hydroxide
- C) Sodium sulfate
- D) Sodium oxide
- Answer: B) Sodium hydroxide
- One mole of water vapor occupies a volume of 22.4 L at:
- A) Standard temperature and pressure (STP)
- B) Room temperature
- C) Zero degrees Celsius
- D) High pressure
- Answer: A) Standard temperature and pressure (STP)
- In titration, phenolphthalein is used as an indicator in:
- A) Strong acid-strong base titration
- B) Weak acid-strong base titration
- C) Strong acid-weak base titration
- D) Neutralization reactions
- Answer: B) Weak acid-strong base titration
- The ideal gas equation is expressed as:
- A) PV = nRT
- B) P + V = nRT
- C) PRT = V/n
- D) PV/n = RT
- Answer: A) PV = nRT
- The element with the highest ionization energy in the periodic table is:
- A) Helium
- B) Hydrogen
- C) Oxygen
- D) Fluorine
- Answer: A) Helium
- The primary structural component in proteins is:
- A) Polypeptides
- B) Lipids
- C) Sugars
- D) Nucleotides
- Answer: A) Polypeptides
- Which one of the following is an essential fatty acid?
- A) Stearic acid
- B) Oleic acid
- C) Linoleic acid
- D) Acetic acid
- Answer: C) Linoleic acid
- Baking soda is chemically known as:
- A) Sodium carbonate
- B) Sodium bicarbonate
- C) Sodium hydroxide
- D) Sodium sulfate
- Answer: B) Sodium bicarbonate
- Sucrose on hydrolysis gives:
- A) Glucose + Maltose
- B) Glucose + Fructose
- C) Fructose + Galactose
- D) Maltose + Lactose
- Answer: B) Glucose + Fructose
- In chemical kinetics, the order of a reaction is determined by:
- A) Concentration of products
- B) Concentration of reactants
- C) Rate-determining step
- D) Overall reaction equation
- Answer: B) Concentration of reactants
- The element that exhibits catenation property predominantly is:
- A) Nitrogen
- B) Phosphorus
- C) Sulfur
- D) Carbon
- Answer: D) Carbon
- The process used to separate petroleum into various components is called:
- A) Filtration
- B) Crystallization
- C) Fractional distillation
- D) Electrolysis
- Answer: C) Fractional distillation
- A basic oxide will typically react with water to form a:
- A) Neutral solution
- B) Acidic solution
- C) Basic solution
- D) Salt only
- Answer: C) Basic solution
- The oxidation number of chromium in potassium dichromate (K₂Cr₂O₇) is:
- A) +3
- B) +5
- C) +6
- D) +7
- Answer: C) +6
- The color of Fe²⁺ ions in aqueous solution is:
- A) Blue
- B) Green
- C) Yellow
- D) Brown
- Answer: B) Green
- The compound used as an anesthetic in minor surgeries is:
- A) Ethanol
- B) Ether
- C) Acetone
- D) Benzene
- Answer: B) Ether
- Chlorofluorocarbons (CFCs) are harmful because they:
- A) Pollute water
- B) Deplete the ozone layer
- C) Cause acid rain
- D) Reduce soil fertility
- Answer: B) Deplete the ozone layer
- The functional group in aldehydes is:
- A) -COOH
- B) -CHO
- C) -OH
- D) -COO
- Answer: B) -CHO
- A solution that resists changes in pH when small amounts of acid or base are added is called:
- A) Buffer
- B) Acidic
- C) Basic
- D) Neutral
- Answer: A) Buffer
- The number of moles of solute present in 1 liter of a solution is called:
- A) Molarity
- B) Molality
- C) Normality
- D) Formality
- Answer: A) Molarity
- A compound that contains both ionic and covalent bonds is:
- A) HCl
- B) NH₃
- C) NaCl
- D) NaOH
- Answer: D) NaOH
- The main component of natural gas is:
- A) Methane
- B) Ethane
- C) Propane
- D) Butane
- Answer: A) Methane
- Which one of the following is an alloy of copper and zinc?
- A) Brass
- B) Bronze
- C) Steel
- D) Solder
- Answer: A) Brass
- When a base dissolves in water, it releases:
- A) OH⁻ ions
- B) H⁺ ions
- C) O₂ molecules
- D) CO₂ molecules
- Answer: A) OH⁻ ions
- The pH of a neutral solution at 25°C is:
- A) 7
- B) 0
- C) 1
- D) 14
- Answer: A) 7
- The ion responsible for the hardness of water is:
- A) Na⁺
- B) K⁺
- C) Mg²⁺
- D) H⁺
- Answer: C) Mg²⁺
- Which organic compound is a common solvent and known as wood alcohol?
- A) Ethanol
- B) Methanol
- C) Propanol
- D) Butanol
- Answer: B) Methanol
- A triglyceride is formed by the reaction of glycerol with:
- A) Carboxylic acids
- B) Fatty acids
- C) Amino acids
- D) Hydrocarbons
- Answer: B) Fatty acids
- Electrolysis of molten NaCl yields:
- A) Na and Cl₂
- B) NaClO
- C) H₂ and Cl₂
- D) NaOH and Cl₂
- Answer: A) Na and Cl₂
- Which one of the following is used to detect proteins?
- A) Benedict’s test
- B) Biuret test
- C) Tollen’s test
- D) Iodine test
- Answer: B) Biuret test
- Among the following, the most reactive metal is:
- A) Iron
- B) Copper
- C) Potassium
- D) Magnesium
- Answer: C) Potassium
- The monomer of polythene is:
- A) Ethene
- B) Propene
- C) Styrene
- D) Vinyl chloride
- Answer: A) Ethene
- The bleaching action of chlorine is due to:
- A) Oxidation
- B) Reduction
- C) Hydrolysis
- D) Precipitation
- Answer: A) Oxidation
- Aluminum is extracted from its ore by:
- A) Reduction
- B) Electrolysis
- C) Distillation
- D) Crystallization
- Answer: B) Electrolysis
- Which of the following is a synthetic polymer?
- A) Wool
- B) Nylon
- C) Silk
- D) Cotton
- Answer: B) Nylon
- The process of rusting involves:
- A) Oxidation
- B) Reduction
- C) Sublimation
- D) Distillation
- Answer: A) Oxidation
- The ideal gas equation holds true for:
- A) All conditions
- B) High pressure and low temperature
- C) Low pressure and high temperature
- D) All solids
- Answer: C) Low pressure and high temperature
- The color of potassium permanganate in solution is:
- A) Pink
- B) Yellow
- C) Green
- D) Blue
- Answer: A) Pink
- The compound that releases OH⁻ ions in water is called a:
- A) Base
- B) Acid
- C) Salt
- D) Nonelectrolyte
- Answer: A) Base
