MCQs JEE Advances 

1. A rectangular sheet of fixed perimeter with sides having there lengths in the ratio 8 : 15 is converted into an open rectangular box by folding after removing squares of equal area from all four corners. If the total area of removed squares is 100, the resulting box has maximum volume. The lengths of the sides of the rectangular sheets are 
(a) 24                                                                    
(b) 32
(c) 45                                                                    
(d) 60                                                                                   
Ans (a,c)
2. The initial rate of hydrolysis of methyl acetate (1 M) by a weak acid (HA, 1M) is 1/100th of that of a strong acid (HX, 1M),
at 25°C. The Ka (HA) is
(a) 1 x 10-4                                                          
(b) 1 x 10-5
(c) 1 x 10-6                                                           
(d) 1 x 10-3                                                                          
Ans (a)
3. The pair(s) of coordination complexes/ions exhibiting the same kind of isomerism is(are)
(a) [Cr(NH3)5Cl]Cl2 and [Cr(NH3)4Cl2]Cl
(b) [Co(NH3)4Cl2]+ and [Pt(NH3)4Cl2]Cl
(c) [CoBr2Cl2]2- and [PtBr2Cl2]2-
(d) [Pt(NH3)3(NO3)]Cl and [Pt(NH3)3Cl]Br                                                                                                              
Ans (b,d)
4. Methylene blue, from its aqueous solution, is absorbed on activated charcoal at 25°C. For this process, the correct statement is
(a) the absorption requires activation at 25°C
(b) the absorption is accompanied by a decreases in enthalpy
(c) the absorption increases with increase of temperature
(d) the absorption is irreversible                                                                                                                                              
Ans (b)
5. Sulphide ores are common for the metals
(a) Ag, Cu and Pb                                            
(b) Ag, Cu and Sn
(c) Ag, Mg and Pb                                           
(d) Al, Cu and Pb                                                                             
Ans (a)
6. Upon treatment with ammoniacal H2S, the metal ion that precipitates as sulphide is
(a) Fe (III)                                                           
(b) Al (III)
(c) Mg (II)                                                           
(d) Zn (II)                                                                                            
Ans (d)
7. Concentrated nitric acid, upon long standing, turns yellow-brown due to the formation of
(a) NO                                                                  
(b) NO2
(c) N2O                                                                
(d) N2O4                                                                                              
Ans (b)
8. Consider the following complex ions, P, Q and R. P = [FeF6]3-, Q = [V(H2O)6]2+ and R = [Fe(H2O)6]2+ The correct order of the complex ions, according to their spin-only magnetic moment values (in BM) is
(a) R < Q < P                                                      
(b) Q < R < P
(c) R < P < Q                                                       
(d) Q < P < R                                                                                      
Ans (b)
9. The compound that does not liberate CO2, on treatment with aqueous sodium bicarbonate solution, is
(a) benzoic acid
(b) benzenesulphonic acid
(c) salicylic acid
(d) carbolic acid (Phenol)                                                                                                                                              Ans (d)
10. The standard enthalpies of formation of CO2(g), H2O(l) and glucose(s) at 25°C are -400 kJ/mol, -300 kJ/mol and -1300 kJ/mol and standard enthalpy of combustion per gram of glucose at 25°C is
(a) +2900 kJ                                                       
(b) -2900 kJ
(c) -16.11 kJ                                                       
(d) + 16.11 kJ                                                                                     
Ans (c)
For More MCQs JEE Advances - Click Here