Q48. During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in $\mathrm { NH } _ { 4 } \mathrm { OH }$ solution when sodium carbonate extract was first acidified with dil. $\mathrm { HNO } _ { 3 }$ and then $\mathrm { AgNO } _ { 3 }$ solution was added. This indicates presence of :\\
(1) $\mathrm { Br } ^ { - }$\\
(2) $\mathrm { I } ^ { - }$\\
(3) $\mathrm { Cl } ^ { - }$\\
(4) $\mathrm { CO } _ { 3 } { } ^ { 2 - }$
Q49.\\
List - I List - II\\
Reaction Type of redox reaction
Match List - I with List - II.\\
(A) Li\\
(B) Na\\
(III) 670.8\\
(IV) 780.0\\
(C) Rb\\
(I) 589.2\\
(II) 455.5\\
(D) Cs
Choose the correct answer from the options\\
given below :\\
(1) (A)-(II), (B)-(IV), (C)-(III), (D)-(I)\\
(2) (A)-(I), (B)-(IV), (C)-(III), (D)-(II)\\
(3) (A)-(IV), (B)-(II), (C)-(I), (D)-(III)\\
(4) (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
Q50.\\
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The incorrect statements regarding enzymes are : (A) Enzymes are biocatalysts. (B) Enzymes are non-specific and can catalyse different kinds of reactions. (C) Most Enzymes are globular proteins. (D) Enzyme - oxidase catalyses the hydrolysis of maltose into glucose. Choose the correct answer from the option given below :\\
(1) (B), (C) and (D)\\
(2) (B) and (D)\\
(3) (A), (B) and (C)\\
(4) (B) and (C)