200 mL of an aqueous solution contains 1.26 g of protein. The osmotic pressure of this solution at 300 K is found to be 2.57 × 10–3 bar. The molar mass of protein will be:
(Use: R = 0.083 L bar mol–1 K–1)
| 1. | 61038 g mol–1 | 2. | 51022 g mol–1 |
| 3. | 122044 g mol–1 | 4. | 31011 g mol–1 |
Match List I with List II for the composition of substances and select the correct answer using the code given below:
| List-I Substances |
List-II |
| (A) Plaster of paris | (i) CaSO4. 2HO |
| (B) Epsomite | (ii) CaSO4.½H2O |
| (C) Kieserite | (iii) MgSO4.7H2O |
| (D) Gypsum | (iv) MgSO4.H2O |
| (v) CaSO4 |
Code :
| (A) | (B) | (C) | (D) | |
| 1. | (iv) | (iii) | (ii) | (i) |
| 2. | (iii) | (iv) | (i) | (ii) |
| 3. | (ii) | (iii) | (iv) | (i) |
| 4. | (i) | (ii) | (iii) | (v) |
The following reactions take place in the blast furnace in the preparation of impure iron.
Identify the reaction pertaining to the formation of the slag.
1. 2C(s) + O2(g) → 2CO (g)
2. Fe2O3(s) + 3CO (g) → 2Fe(l) + 3CO2(g)
3. CaCO3(s) → CaO(s) + CO2(g)
4. CaO(s) + SiO2(s) → CaSiO3(s)
Which of the following statements is incorrect?
| 1. | NaHCO3 on heating gives Na2CO3. |
| 2. | Pure sodium metal dissolves in liquid ammonia to give a blue solution. |
| 3. | NaOH reacts with glass to give sodium silicate. |
| 4. | Aluminium reacts with excess NaOH to give Al(OH)3. |
The first ionization enthalpy of sodium (Na) is 5.1eV. Using this information, determine the value of the electron gain enthalpy of \(\mathrm{Na^+}\):
1. +10.2 eV
2. –5.1 eV
3. –10.2 eV
4. +2.55 eV
Which of the following has the greatest number of molecules?
1. 64 g SO2
2. 44 g CO2
3. 48 g O3
4. 8 g H2
A solid compound XY has NaCl structure. If the radius of the cation is 100 pm, the radius of the anion (Y–) will be:
1. 165.7 pm
2. 175.1 pm
3. 322.5 pm
4. 241.5 pm
The carbonyl compound with the strongest C-O bond is:
1. Fe(CO)5
2. [Mn(CO)6]+
3. Cr(CO)6
4. [V(CO)6]-
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