Archives

0.05 F charge is passed through a lead storage battery. In the anodic reaction, what is the amount of PbSO₄ precipitated (Molar mass of PbSO₄ is 303 g/mol)

a) 30.3 g b) 15.5 g c) 7.6 g d) 60.6 g Answer: (c) Charge = 0.05 F Amount of PbSO4 precipitated = W Molar mass of PbSO4 = 303 g/mol... View Article

2a plus b gets product

[A] [B] Rate (M min-1 ) 0.1 0.20 6.93 x 10-3 0.1 0.25 6.93 x 10-3 0.2 0.3 1.386 x 10-2 Time when concentration of A becomes half a)... View Article

Which of the following is not correct about Henry’s law.

a) On increasing temperature value of KH increases b) Value of KH increases solubility of gas increases c) Value of KH for two different gases... View Article

20 ml of 0.1 M H₂SO₄ is added to 30 ml of 0.2 M NH ₄OH then calculate pH of resultant solution. (Given that P ^Kb of NH₄OH is 4.7)

a) 9 b) 9.4 c) 5.2 d) 5 Answer: (a) H2SO4+2 NH4OH → (NH4)2SO4+ H2O 20 × 0.1 ; 30 × 0.2 It is a complete... View Article

Which of the following options is correct for given curve?

a) (x/m) ∝ (P)1/2 b) (x/m) ∝ (P) c) (x/m) ∝ (P)2 d) (x/m) ∝ (P)0 Answer: (a) According to Freundlich isotherm... View Article

The weight of Na⁺ in the solution of Na₂ SO₄ is 92g . Find molality of Na₊ per kg of water?

a) 2 b) 4 c) 6 d) 8 Answer:(b) Given: Na2 SO4. ⎯⎯→ Na+ = 92 gm To find: Molality of Na+ per kg of water Formula: Molality per kg =... View Article

The number of chiral centres in Penicillin is ____.

Answer: 3 The structure of penicillin is shown below: So, the number of chiral centers = 3... View Article

The magnitude of work done by gas that undergoes a reversible expansion along the path ABC shown in figure is

Answer: Work done by the gas = The area under the curve = (Area of the square) + (Area of the triangle) = 48 J... View Article

Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to achieve 10 ppm of iron in 100 kg of wheat is _______. Atomic weight: Fe=55.85; S=32.00; O=16.00)

Answer: 4.96 g 10 ppm of Fe means 10 g of Fe in 106 g of wheat. So, for 100 kg i.e.,105 g of wheat. needed is 1 g. So, for 1 g of Fe, the mass... View Article

What will be the electrode potential for the given half cell reaction at pH= 5?

2 2 → 2 + 4 + + 4 –; ° = – 1.23 (R=8.314 J mol-1K-1; temp.=298 K; oxygen under std. atm. Pressure of 1 bar.) Answer:2 2 → 2 + 4 + + 4 –;... View Article

The volume (in mL) of 0.125 M ₃ required to quantitatively precipitate chloride ions in 0.3 g of [ ( ₃ )₆ ] ₃ is _____.

[ ( 3 )6 ] 3 = 267.46 / 3 = 169.87 g/mpl Answer: To react completely with one mole of [ 6] 3 , 3 moles of 3 is required. 0.3 g [ 6 ] 3... View Article

The reagent used for the given conversion is:

a. 2 6 b. 4 c. 4 d. 2, Answer: 2 6 does not reduce amide, carbonyl group and cyanide. It selectively reduces carboxylic acid to... View Article

Which of the given statement is not true for glucose?

a. The pentacetate glucose does not react with hydroxylamine to give oxime b. Glucose reacts with hydroxylamine to form oxime. c. Glucose... View Article

A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at 63 °C while the other boils at 60 °C. What is the best way to separate the two liquids and which one will be distilled out first?

a. Fractional distillation, isohexane b. Simple distillation, 3-methylpentane c. Fractional distillation, 3-methylpentane d. Simple... View Article

The strength of an aqueous NaOH solution is most accurately determined by titrating: (Note: consider that an appropriate indicator is used)

a. Aq. NaOH in a pipette and aqueous oxalic acid in a burette b. Aq. NaOH in a volumetric flask and concentrated H2SO4 in a conical flask c.... View Article