a 44 0 b. 6 g 16.6g d. 36g 22. In the reaction above, the reactants are a. CHa a

Question

a 44 0 b. 6 g 16.6g d. 36g 22. In the reaction above, the reactants are a. CHa and Oa b. CO: and H2O c. CHa and Co 23. The name of the compound NazSe a. Sodium selenium c. Disodium selenide b. Sodium selenide 4. The following elements have six dots around them except c. Sr a. Te b. S d. Se 25. Anesthetics are able to pass through the blood brain barrier because they are d) polar a) covalent c) ionic b) dissolved in water 26. A small amount of KI is added to most table salt to: a) prevent caking c) prevent thyroid problems b) reduce spoilage d) reduce cholesterol 27. All of the following were early anesthetics except a) CHClb c) CsH18 b) C4HIoO d) N2O 28. The number of electrons in the ion Fe is b. 56 c. 29 d. 23 a. 26 29. Metals or nonmetals react so as to be isoelectronic with a. elements in group 4 b. elements in group 5 c. elements in group 8 d. elements in group 7 30. The following compounds are ionic compounds except d. NH4CI b. Na2O c. NaH a. NaCI

Explanation / Answer

23)b Sodium selenide

24)d Se

Te, Se and S are all group 6 elements hence having 6 valence electrons. Sr is a group 2 element with 2 valence electrons

25)a covalent

lipophilic and unionised forms and less polar cross the blood brain barrier. hence b,c and d are wrong

26)c to prevent thyrpid problems. They are added as sources of iodine.

please ask questions separately

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