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11.Which of the following reactions does not produce ethyne

 

ELECTRIC SPARK

a. C + H₂----------------à                       b. CaC₂ + H₂0----à

c. Al₄C₃  +  H₂O----à                    d.CHI₃  + Ag-------à

 

12. An aromatic compound C₇H₇Cl on oxidation gives another aromatic compound which on sodalime decarboxylation gives benzene. The original compound is

a. o-chlorotoluene            b. p-chlorotoluene

c. Benzyl chloride              d. Benzal chloride

 

13. The IUPAC name of the compound is

 

OHC-CH2-CH-CH2-CHO

                                 |

                                CHO

            a. 1,2,3 triformylpropene                          b. propantrial-1,2,3

            c. 3-formyl-1,5-pentanedial                   d. glyceraldehyde

 

14. Zero conductance is shown by

a. [Cr(NH₃)₅Cl]Cl₂                                       b. [Cr(NH₃)₄Cl₂]Cl

c. [Cr(NH₃)₃Cl₃]                                            d. [Cr(NH₃)₆]Cl₃

 

15. Consider the following equilibria

 

(i) SO₂(g)  +  ½ O₂ (g)         « SO₃ (g),    K₁

(ii) 2SO₃(g)               «       2SO₂+ ½ O₂(g),        K₂

            If K1 is 4310^-3, then K₂ will be

            a. 8 3 10^-3                            b. 16310^-6

            c. 6.25310⁴                         d. 6.25310⁸

 

16. The dissociation constants of monobasic acids A,B,C are 6310^-4, 5310^-5, 73 10^-10 respectively. The pH of their 0.1 M solution will be

a. A>B>C      b. C>B>A      c. A>B<C      d. A=B=C

 

17. Which of the following is not expected to be correct?

a. DH_{neutralisation}=Negative b. DH_combustion(NO)=Positive

c. DH_f⁰(CO₂) = Negative              d. DH_hyd(BaCl₂)= Negative

 

18. In which compund, the ratio of anion to cation size is minimum?

a. LiF               b.LiI                 c. CsF             d. CsI

 

19. Bond angle in Ozone is approximately

a. 120⁰           b. 180⁰           c. 109⁰           d. 90⁰

 

20. Which one of the following is aprotic solvent?

a. Chloroform                      b. Benzene              

c. Sulphur dioxide             d. All the three