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Paracetamol is

A. Methyl salicylate B. Phenyl salicylate C. N-acetyl-p-aminophenol D. Acetyl salicylic acid Solution: (C) N-acetyl-para-aminophenol,... View Article

Which of the following is used as antipyretic and analgesic?

A. Paracetamol B. Sulphaguanide C. Phenol D. Penicillin Solution: (A) Paracetamol is used as an antipyretic as well as an analgesic.... View Article

Use of chemicals for therapeutic effect is called:

A. Medicines B. Chemotherapy C. Drug-target interaction D. Phototherapy Solution: (B) Chemotherapy is a form of drug treatment wherein... View Article

What are the substances which mimic the natural chemical messengers?

A. Antibiotics B. Antagonist C. Agonist D. Receptors Solution: (C) Agonists are the chemicals that usually bind themselves to a receptor and... View Article

MnO₄^– ions are reduced in acidic condition to Mn²⁺ ions whereas they are reduced in neutral condition to MnO₂ . The oxidation of 25mL of a solution X containing Fe²⁺ ions required in acidic condition 20 mL of a solution Y containing MnO4 ions. What volume of solution Y would be required to oxidise 25mL of a solution X containing Fe²⁺ ions in neutral condition?

A. 11.4mL B. 12.0mL C. 33.3mL D. 35.0mL E. 25.0mL Solution: (C) In acidic medium, MnO4- is reduced to Mn2+ +7 MnO4- → Mn2+... View Article

For the reaction;

Fe2O3 + 3CO → 2Fe + 3CO2 The volume of carbon monoxide required to reduce one mole of ferric oxide is: A. 22.4 dm3 B. 44.8 dm3 C.... View Article

For the reaction represented by the equation;

CX4 + 2O2 → CO2 + 2X2O 9.0 g of CX4 completely reacts with 1.74 g of oxygen. The approximate molar mass of X will be: A. 20 B. 40 C.... View Article

An aromatic hydrocarbon with empirical formula C₅H₄ on treatment with concentrated H₂SO₄ gave a monosulphonic acid. 0.104 g of the acid required 10 ml of N/20 NaOH for complete neutralisation. The molecular formula of hydrocarbon is:

A. C5H4 B. C10H8 C. C15H12 D. C20H16 E. C15H20 Solution: (B) Equivalent of acid = Equivalent of base So, basicity of acid ×... View Article

In the equation:

H2S + 2HNO3 → 2H2O + 2NO2 + S; The equivalent weight of H2S is A. 68 B. 34 C. 17 D. 16 Solution: (C) −2 0 H2S →... View Article

KMnO₄ (m.w. = 158) oxidises oxalic acid in acid medium to CO₂ and water as follows:

5C2O42− + 2MnO4− + 16H+ → 10CO2 + 2Mn2+ + 8H2O What is the equivalent weight of KMnO4? A. 158 B. 31.6 C. 39.5 D. 79... View Article

For the reaction,

Na2CO3 + 2HCl → 2NaCl + H2O + CO2, The equivalent weight of Na2CO3 is: A. M/2 B. M C. 2 M D. M/4 Solution: (C) The reaction... View Article

In the disproportionation reaction:

3HClO3 ⟶ HClO4 + Cl2 + 2O2 + H2O The equivalent mass of the oxidising agent is (molar mass of HClO3 = 84⋅45) A. 16.89 B. 32.22 C.... View Article

Mixture X = 0.02 mole of [Co(NH₃)₅ SO₄] Br and 0.02 mole of [Co(NH₃)rBr]SO₄ was prepared in 2 L of solution.

1 L of the mixture if X + excess AgNO3 → Y 1 L of mixture X + excess BaCl2 → Z Number of moles of Y and Z are: A. 0.01, 0.01 B.... View Article

KMnO₄ reacts with oxalic acid according to the equation:

2MnO4− + 5C2O42− + 16H+ → 2Mn2+ + 10CO2 + 8H2O 20 mL of 0.1 M KMnO4 will react with? A. 20 mL of 0.25 M oxalic acid B. 20... View Article

Find the equivalent weight of KMnO₄ which is in an alka condition and for which the reaction occurs as follows:

2KMnO4 + 2KOH ⟶ 2K2MnO4 + H2O + O A. 31.6 B. 52.7 C. 49 D. 158 Solution: (D) Equivalent mass of KMnO4 = Molecular Weight / No of... View Article

The enthalpy of combustion of methane at 25 ^∘C is 890 kJ. The heat liberated when 3.2 g of methane is burnt in the air is:

A. 445 kJ B. 278 kJ C. -890kJ D. 178 kJ Solution: (D) Number of moles of methane burnt = 3.2 / 16 = 0.2 Enthalpy of combustion of 1... View Article

The volume of oxygen necessary for the complete combustion of 20 litre of propane is:

A. 40 litre B. 60 litre C. 80 litre D. 100 litre Solution: (D) C3H8 + 5O2 → 3CO2 + 4H2O From the equation: 1 volume of C3H8... View Article

When 10 g of 90% pure limestone is heated completely, the volume (in litres) of CO₂ is liberated at STP is:

A. 22.4 B. 2.24 C. 20.6 D. 2.016 Solution: (D) As per the questions the sample of limestone is only 90 % pure. Thus, 100 g limestone... View Article

2g of a mixture of CO and CO₂ on reaction with excess I₂O₅ produced 2.54 g of I₂. What would be the mass % of CO₂ in the original mixture?

A. 60 B. 30 C. 70 D. 35 Solution: (B) 5CO + I2O5 → 5 CO2 + I2 1 mol of I2 = 1 mol of I2O5 = 5 mol of CO Hence, mol of CO = 5... View Article

Air contains 20% O₂ by volume. How many cc of air will be required for oxidation of 100 cc of acetylene?

A. 500 cc B. 1064 cc C. 212.8 cc D. 1250 cc Solution: (D) Writing the reaction down, 2C2H2 + 5O2 → 4CO2 + 2H2O 2 moles of C2H2... View Article