21.

Metal ion responsible for the Minimata disease is

• CO²⁺

• Hg²⁺

• Cu²⁺ 

• Zn²⁺

The compressibility factor (Z) of one mole of a van der Waals' gas of negligible 'a' value is

• 1

• $\frac{\mathrm{bp}}{\mathrm{RT}}$

• $1 + \frac{\mathrm{bp}}{\mathrm{RT}}$

• $1-\frac{\mathrm{bp}}{\mathrm{RT}}$

The volume of ethyl alcohol (density 1.15 g/cc) that has to be added to prepare 100 cc of 0.5 M ethyl alcohol solution in water is

• 1.15 cc

• 2 cc

• 2.15 cc

• 2.30 cc

The bond angle in NF₃ (102.3°) is, smaller than NH₃ (107.2°). This is because of

• large size of F compared to H

• large size of N compared to F

• opposite polarity of N in the two molecules

• small size of H compared to N

The structure of XeF₆ is experimentally determined to be distorted octahedron. Its structure according to VSEPR theory is

• octahedron

• trigonal bipyramid

• pentagonal bipyramid

• tetragonal bipyramid

For a spontaneous process, the correct statement(s) is (are)

• ($∆$G_system)_T, p > 0

• ($∆$S_system) + ($∆$S_surroundings) > 0

• ($∆$G_system)_T, p < 0

• ($∆$U_system)_t, v > 0

The IUPAC name of the following molecule is

• 5,6-dimethylhept-2-ene

• 2,3-dimethylhept-5-ene

• 5,6-dimethylhept-3-ene

• 5-iso-propylhex-2-ene

The reagents to carry out the following conversion are

• HgSO₄/dil. H₂SO₄

• BH₃; H₂O₂/NaOH

• OSO₄; HIO₄

• NaNH₂/ CH₃I; HgSO₄/ dil.H₂SO₄

Among the following structures the one which is not a resonating structure of others is

• I

• II

• III

• IV

If Cl₂ is passed through hot aqueous NaOH, the products formed have Cl in different oxidation states. These are indicated as

• -1 and +1

• -1 and +5

• +1 and +5

• -1 and +3