Question Paper B. Pharma

1. an aqueous sucrose (molar mass=342) solution is labeled as 20% w/w. What is the mole fraction of water in this solution?
(a) 0.945                      
(b) 0.955
(c) 0.987                      
(d) 0.961
Ans. (c)
2. The density of 20% (w/w) aqueous KI solution is 1.202 g mL-1. What is its approximate molality? (molar mass of KI=166)
(a) 2.5 m                      
(b) 0.5 m
(c) 1.5 m                      
(d) 0.15 m
Ans. (c)
3. A compound is formed by elements ‘X’ (cations) and ‘Y’ (anions). Ions of ‘Y’ form cubic close packing (ccp) and ions of ‘X’ occupy all the octahedral voids. What is the molecular formula of the compound?
(a) X2Y                         
(b) XY2
(b) XY                          
(d) X2Y3
Ans. (c)
4. Which one of the following statements is correct?
(a) Cyclohexadiene is an aromatic compound
(b) Deactivating groups are ortho and para directing groups.
(c) Reaction of benzene with I-chloropropane and anhydrous AlCl3 gives n- propylbenzene
(d) Electrophilic substitution of benzene takes place via -complex
Ans. (d)
5. Which one of the following statements is not correct?
(a) Electrolysis of sodium acetate gives methane.
(b) Alkanes undergo halogenations by free radical mechanism.
(c) Ethane exhibits conformational isomerism.
(d) Sodium acetate on heating with soda lime gives methane.
Ans. (a)
6. What are the heights (km) from the sea level for Troposhere and stratosphere?
(a) 10-20 and 1-10
(b) 5 and 10-50
(c) 10 and 10-50
(d) 10-30 and 5-10
Ans. (c)
7. What is the nature of aqueous borax solution?
(a) Neutral                    
(b) Acidic
(c) Alkaline                   
(d) Amphoteric
Ans. (c)
8. Which lithium halide is soluble in pyridine?
(a) LiBr                         
(b) LiF
(c) LiCl                         
(d) Li
Ans. (c)
9. Hydrogen resembles alkali metals in many aspects but differs in:
(a) Halide formation
(b) Metallic characters
(c) Oxide formation
(d) Sulphide formation
Ans. (b)
10. Which one of the following is not correct?
(a) Number of unshared electrons on the atom is also considered for calculation of formal charge.
(b) Formal charges help in the selection of the lowest energy structure of molecule.
(c) Formal charges indicate real charge separation within the molecule
(d) Formal charges of each atom of polyatomic ion can be calculated.
Ans. (c)
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