Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

NEET Chemistry Solved Question Paper 2011

Long Answer Type

41.
In 'x' mL 0.3 N HCl, the addition of 200 mL distilled water or addition of 100 mL 0.1 N NaOH, gives the same final acid strength. Determine 'x'.

Case I

When 200 mL distilled water is added to x mL solution

x X 0.3 = (x + 200) X y

Here, y = final normality or concentration.

$∴$ y = $\frac{0.3 x}{(x + 200)}$

Case II

Number of equivalents of HCl = $\frac{0.3 \times x}{1000}$

Number of equivalents of NaOH = $\frac{100 \times 0.1}{1000}$ = 0.01

Number of equivalents of HCl remained after addition of NaOH = $\{\frac{0.3 x}{1000} - 0.01\}$

$∴$ Concentration = $\frac{\{\frac{0.3 x}{1000} - 0.01\}}{100 + x}$ x 1000

As final acid strength is same in both cases $\frac{\{\frac{0.3 x}{1000} - 0.01\} 1000}{100 + x}$ = $\frac{0.3 x}{200 + x}$

or (0.3 x -10) x (200 + x) = (0.3x)(100 + x)

or 60 x -2000 + 0.3x² - l0x = 30x + 0.3x²

or 20x = 2000 or x = 100 ml

42.

Compound A treated with NaNH₂ followed by CH₃CH₂Br gave compound B. Partial hydrogenation of compound B produced compound C, which on ozonolysis gave a carbonyl compound D, (C₂H₅O). Compound D did not respond to the iodoform test with I₂/KI and NaOH. Find out the structures of A, B, C and D.

43.

The bacterial growth follows the rate law, dN/dt = kN where k is a constant and 'N' is the number of bacteria cell at any time. If the population of bacteria (number of cell) is doubled in 5 min find the time in which the population will be eight times of the initial one?

44.

An organic compound with molecular formula C₉H₁₀O forms 2, 4-DNP derivative, reduces Tollen's reagent and undergoes Cannizaro reaction. On vigorous oxidation, it gives a dicarboxylic acid which is used in the preparation of terylene. Identify the organic compound.

45.

Deep blue CuSO₄^.5H₂O is converted to a bluish-white salt at 100^oC. At 250^oC and 750^oC it is then transformed to white powder and black material respectively. Identify the salts.