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Some Basic Concepts of Chemistry · Question 45

AIPMT 2002MCQEasy📈 Topic in 50% papers+4−1
1

Which has maximum molecules?

  1. 7 g N2
  2. 2 g H2
  3. 16 g NO2
  4. 16 g O2

Answer

(2) 2 g H2

Solution

Number of molecules number of moles = massmolar mass

⇒ N2: 728 = 0.25 mol

⇒ H2: 22 = 1 mol

⇒ NO2: 1646 = 0.35 mol

⇒ O2: 1632 = 0.5 mol

∴ 2 g H2 has the maximum number of molecules (1 mol = 6.022 1023 molecules).

Answer: (2)

AIPMT 2002

Keep practising — Some Basic Concepts of Chemistry

2

The percentage of C, H and N in an organic compound are 40%, 13.3% and 46.7% respectively then empirical formula is

  1. C3H13N3
  2. CH2N
  3. CH4N
  4. CH6N
AIPMT 2002
3

2.5 litre of 1 M NaOH solution is mixed with another 3 litre of 0.5 M NaOH solution. Then find out molarity of resultant solution.

  1. 0.80 M
  2. 1.0 M
  3. 0.73 M
  4. 0.50 M
AIPMT 2002
4

Percentage of Se in peroxidase anhydrous enzyme is 0.5\% by weight (at. wt. = 78.4), then the minimum molecular weight of peroxidase anhydrous enzyme is

  1. 1.568 104
  2. 1.568 103
  3. 15.68
  4. 2.136 104
AIPMT 2001
5

Molarity of liquid HCl, if density of solution is 1.17 g/cc, is

  1. 36.5
  2. 18.25
  3. 32.05
  4. 42.10
AIPMT 2001
6

Specific volume of cylindrical virus particle is 6.02 10-2 cc/g whose radius and length are 7 A and 10 A respectively. If NA = 6.02 1023, find molecular weight of virus.

  1. 15.4 kg/mol
  2. 1.54 104 kg/mol
  3. 3.08 104 kg/mol
  4. 3.08 103 kg/mol
AIPMT 2001
7

Volume of CO2 obtained by the complete decomposition of 9.85 g of BaCO3 is

  1. 2.24 L
  2. 1.118 L
  3. 0.84 L
  4. 0.56 L
AIPMT 2000

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