EAMCET Chemistry Model Questions for Practice

121.The order of first electron affinity of O, S and Se is
1) O > S > Se 2) S > O > Se 3) S > Se > O 4) Se > S > O
122. The presence of primary alcoholic group in glucose can be identified by
1) Oxidation to gluconic acid with Br2 water.
2) glucose reduces tollens reagent
3) glucose undergoes reversible isomerization
4) oxidation to saccharic acid with conc. HNO3

123. The correct order of carbon - carbon bond length in the following
1) C2 H6 > C2 H4 > C6 H6 > C2 H2 > 2) C2 H6 > C2 H4 > C2 H2 > C6 H6
3) C2 H6 > C6 H6 > C2 H4 > C2 H24) C6 H6 > C2 H6 > C2 H4 > C2 H2

124. Among the following, which one is the most effective protective colloid ? (Gold numbers are given in brackets)
1) Gelatin (0.005) 2) Haemoglobin (0.03)
3) Albumin (0.1) 4) Potato starch (25)

125. Matte is
1) 98 % pure copper 2) 95 % pure Zinc
3) Cu2S with little FeS 4) Iron containing 4 % carbon 4%

126. Correct statements in the following
a) Garlic odour of acetylene is due to PH3 and H2 S as impurities
b) Mustard gas is the addition product of acetylene with SCl2
c) Acetylene undergo nucleophilic addition reactions in the presence of heavier metal ions
d) On ozonolysis acetylene gives oxalic acid
1) All 2) b and d
3) b, c and d 4) a and c only

127.
In the above sequence 'B' is
1) Acetanilide 2) Acetophenone
3) Benzophenone 4) N- Phenyl acetamide

128. The volume of CO2 in litres liberated at STP when 3.18 gms of Na2 CO3 is treated with excess of dilute H2 SO4 is
1) 0.112 2) 0.672 3) 0.336 4) 0.448

129. The oxidation state of Nitrogen is lowest in
1) N3H 2) NH2OH 3) NH2NH2 4) NH3

130. The ratio of average kinetic energies of SO2 and O2 at 25ºC.
1) 1:1 2) 1: 2 3) 2 :1 4) 4 :1

131. 99% of a first order reaction was completed in 32 min. When will 99.9% of the reaction complete
1) 16 min 2) 32 min 3) 64 min 4) 48 min

132. A : In the hydrides of IVA group from CH4 to SnH4 reducing nature increases
R: CH4 to SnH4 thermal stability decreases as bond energy decreases
1) Both A and R are true and R is the correct explanation of A.
2) Both A and R are true and R is not the correct explanation of A.
3) A is true, R is false A 4) A is false but R is true.

133. The number of three centered, 2 electron bonds in diborane is
1) 2 2) 4 3) 3 4) 6

134. In Ramsay - Rayleigh's first method, nitrogen of air is removed in the form of
1) 2 CaCN 2) 3 2 Mg N 3) 2 3 NaNO NaNO + 4) 2 NO NO +

135. In Nalgonda technique for defluoridation of water, the chemical/s used are
1) Bleaching powder 2) Lime 3) Alum 4) All the above

136. In the conversion of aniline to acetanilide the correct order of reactivity of acetylating agents is
1) (CH3CO)2 O > CH3COOC2H5 > CH3COCl
2) CH3COOC2H5 > (CH3CO)2 O > CH3COCl
3) CH3COCl > (CH3CO)2 O > CH3COOC2H5
4) CH3COCl > CH3COOC2H5 > (CH3CO)2 O

137. The monomer of the polymer 'Teflon' is
1) Freon 2) Tetra fluoro ethane 3) tetra fluoro ethyne 4) Tetra fluoro ethene

138. Match the following
List . I List . II
1. MnO / 3000C A. Preparation of acetaldehyde from ethanoyl chloride
2. H2 / Pd . BaSO4 B. Hydration of alkynes
3. PdCl2/ CuCl2, H+ C. Catalyst used in the preparation of acetone from acetic acid
4. 1% HgSO4, H2SO4, 00C D. Hydroxylation of alkenes
E. Hydration of alkenes
The correct match is
1) 1 - C, 2 - E, 3 - A, 4 - D 2) 1 - C, 2 - A, 3 - E, 4 - B
3) 1 - A, 2 - C, 3 - B, 4 - E 4) 1 - B, 2 - E, 3 - C, 4 – A

139. The ion with highest magnetic moment is
1) V 3+ 2) Cr3 + 3) Fe 3+ 4) Co3 +

140. Assertion (A) : Standard enthalpy of compound is equal to its standard heat of formation
Reason (R) : Standard enthalpy of elements is assumed to be zero
1) Both A and R are true and R is the correct explanation of A.
2) Both A and R are true and R is not the correct explanation of A.
3) A is true, R is false A
4) A is false but R is true. A

141. SO2 bleaches by
1) Reduction 2) Oxidation 3) Hydrolysis 4) Acidic nature

142. C2H5Cl + KNO2 DMF ¾¾¾® A(Major). The bond absent in 'A' is
1. C - N 2. C - O 3. C - H 4. C – C

143. The cell reaction of a cell is Mg(s) + Cu+2
(aq) lCu(s) +Mg+2
(aq). If the standard reduction potentials of magnesium and copper are -2.38V and +0.33V respectively, the emf of the cell is
1) + 2.03V 2) -2.03V 3) +2.71V 4) -2.71V

144. The % of 'p' character in hybrid orbital of the central atom of PCl5 molecule
1) 25% 2) 50% 3) 75% 4) 60%

145. Consider the statements
I) Maltose is also known as malt sugar
II) Sucrose is also known as cane sugar
III) Lactose is also known as milk sugar
IV) Starch is also known as Amylum
The correct statement is/are
1) I 2) I, II 3) I, II, III 4) I, II, III, IV

146. Which of the following has lowest thermal stability
(1) Li2CO3 (2) Na2CO3 (3) K2CO3 (4) Rb2CO3

147. Setting of plaster of paris involves
1) dehydration process 2) contraction of mass
3) hydration process 4) loss of water molecules

148. A compound formed by elements X and Y crystallizes in a cubic structure in which the X atoms are at the corners of the cube of Y atoms are at the face centres. The formula of the compounds is. X
1) X3 Y 2) XY 3) XY2 4) XY3

149. 0.16gm of an organic compound on combustion gave 0.44gm CO2 and 0.36gm H2O. The percentage weight of C and H in the compound respectively
1) 25 & 75 2) 40 & 60 3) 75 & 25 4) 60 & 40

150. Conditions for acceptable value of 'Y ' (wave function) is
I) 'Y ' must be continuous II) 'Y ' must be infinite
III) 'Y ' must be single valued
IV) The probability of finding the electron over all the space from '+' infinity to ' - ' infinity must be equal to one
1) I only I 2) II only
3) I, III and IV IV 4) IV only

151. Vapour pressure of an aqueous solution is 2% less than that of the solvent. The molality of the solution is nearly.
1) 2m 2) 1.5m 3) 1.13m 4) 0.2m

152. Which of the following solutions will have the highest boiling point
1) 3 0.1M FeCl 2) 2 0.1M BaCl 3) 0.1M NaCl 4) 0.1MUrea

153. Anion exchange resin can be 'revived' by treating with
1) H3PO4 2) 10% HCl 3) Conc. H2SO4 4) Na2CO3.10H2O

154. 0.1M solution of the following has the highest pH.
(1) Na2CO3 (2) NaHCO3 (3) NaOH (4) CH3COOH

155. The pH of 10-8 M - HCl is.
1) 8 2) 6 3) 7 4) 6.98

156. Which of the following is most volatile.
1) HI 2) HBr 3) HCl 4) HF

157.
The incorrect statement regarding B is
1) It is more acidic than rectified spirit
2) Its boiling point is less than ether
3) It is fairly soluble in water 4) It is an aromatic compound

158. Which one of the following will influence both equilibrium state and equilibrium constant
1) Concentration of reactant 2) Presence of catalyst
3) Temperature 4) Pressure

159. SSS Bond angle, S . S bond length and no.of lone pairs present in S8 molecule are
1) 1050 ; 2.12 A0 , 8 2) 1050 , 2.12A0 , 16 3) 1050 ; 1.06A0 , 16 4) 1090.28`; 2.12A0 , 8

160. End product of HELL - VOLHARD - ZELENSKY reaction of actic acid is
1) Cl2HCCOOH 2) Cl 3CCOOH 3) 2 ClCH2COOH 4) (H3CCO)2O

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