Q&A - Ask Doubts and Get Answers

Sort by :
Clear All
Q
Engineering
85 Views   |  

A Hard and resistant alloy generally used in tip of nib of pen is :

 

  • Option 1)

    Os, Ir

  • Option 2)

    Pt, Cr

  • Option 3)

    V , Fe

  • Option 4)

    Fe, Cr

 
As we learnt in Magnetic properties - when a magnetic field is applied to a substance of metals, they show generally two types of magnetic behaviour  1.  Diamagnetism 2.  Paramagnetism -     KMmO4, in this compund, the O.S. of Mn is +7 and it's d-orbitals are vacant. With no unpaired electrons, the compound is diamagnetic.      Option 1) This answer is correct Option 2) This answer is...
Engineering
66 Views   |  

Which of the following complex solution is used for the electroplating of articles with silver? 

  • Option 1)

    [Ag(S_{2}O_{3})_{2}]^{3 -}

  • Option 2)

  • Option 3)

    [Au (CN)_{2}]^{-}

  • Option 4)

 
As we learnt in  Ease of liquification - Increases down the group  - wherein   Ease of liquifaction of noble gases increases down the group as the Vander Wall forces increases with an increase in size.  Ease of Liquifaction.  Correct option is 4.     Option 1) This option is incorrect Option 2) This option is incorrect Option 3) This option is incorrect Option 4) This option is correct
Engineering
98 Views   |  

Which one is the most likely structure of CrCl_{3}.6H_{2}O is \frac{1}{3} of total chlorine of the compound is precipitated by adding AgNO_{3} to its aqueous solution:

  • Option 1)

    Cr\:\: Cl_{3}.6H_{2}O

  • Option 2)

    \left [ Cr(H_{2}O)_{3} \right Cl_{3}]

  • Option 3)

    \left [ Cr\:\:Cl_{2} \right (H_{2}O)_{4} ].Cl

  • Option 4)

    \left [ Cr (H_{2}O)_{5} \right ]Cl_{2}

 
As learnt in Concept @17487 Coordination Sphere - The central atom/ion and the ligands attached to metal are enclosed in square bracket and this collectively termed as coordination sphere - wherein eg:   Counter ion   Coordination sphere      If  of the Chlorine in the compound precipitates, that means  of the chlorine must be in the Co-ordination sphere.  Therefore Structure is    Option...
Engineering
361 Views   |  

Which of the following species is not expected to be a ligand?

  • Option 1)

    NO

  • Option 2)

  • Option 3)

    NH_2CH_2CH_2NH_2

  • Option 4)

    CO

 
  Ligands - Ions and molecules bounds to the Central atom/ion in the coordination entity are called ligands. -    Ions and molecules that bound to the central atom in the coordination sphere are called Ligands.  NH+4 does not have any electron pair to form a coordinate bond with, so it can't act as a ligand.  Option 1) NO This option is incorrect  Option 2) This option is correct  Option...
Engineering
175 Views   |  

Which of the following oxidises is acidic as well as solid at room temperature?

  • Option 1)

    SiO_{2}

  • Option 2)

    CO_{2}

  • Option 3)

    CO

  • Option 4)

    N_{2}O

 
As we learnt in Oxide of Silicon - SiO2 form three dimensional network - wherein Due to lack of formation of with oxygen    Only SiO2  is solid at room tempreature of all the options and it is acidic.      Option 1) This option is correct  Option 2) This option is incorrect  Option 3) This option is incorrect  Option 4) This option is incorrect 
Engineering
145 Views   |  

Which of the following oxides of carbon is not known?

  • Option 1)

    Carbon dioxide

  • Option 2)

    Carbon monoxide

  • Option 3)

    Carbon sub-oxide

  • Option 4)

    Carbon peroxide

 
  Oxides of carbon - Form five oxides CO, CO2, C3O2 (suboxide), C5O2 and C12O9 - wherein - Anhydride of malonic acid - Anhydride of carbonic acid    Carbon forms five kinds of oxides. CO, CO2, C3O2 (suboxide), C5O2 and C12O9 Carbon Peroxide does not exist.    Option 1) Carbon dioxide This option is incorrect Option 2) Carbon monoxide This option is incorrect Option 3) Carbon sub-oxide This...
Engineering
99 Views   |  

Which of the following ligand is bidentate? 

  • Option 1)

    C_{2}O_{4}^{2-}

  • Option 2)

    CH_{3}C\epsilon N

  • Option 3)

    Br^{-}

  • Option 4)

    CH_{3}NH_{2}

 
  Types of Ligands on the basis of Connectivity - (i) Unidentate - ligand is bound to metal ion through a single donor atom. eg:  (ii) Bidentate : when ligand can bind through two donor atoms eg:  (iii) Polydentate - when ligand bind to two or more donor atoms (iv) Hexadentate - type of polydentate having six donor atoms (v) Ambidentate- which can ligate through two different atoms at a...
Engineering
87 Views   |  

Which of the Following is a lanthanoid?

  • Option 1)

    T_{a}

  • Option 2)

    Rh

  • Option 3)

    Th

  • Option 4)

    Lu

 
  Lanthanoides - The fourteen elements from  Ce - Lu is Lanthanoids but the properties of La is much closer to lanthanoid. - wherein    The fourteen elements from Ce----Lu are called Lanthanoids. Of all the elements given only Lu falls in the category.  Option 1) This option is incorrect Option 2) This option is incorrect Option 3) This option is incorrect Option 4) This option is correct
Engineering
507 Views   |  

Which of following is not an ambidentate ligand?

  • Option 1)

    NO_{2}^{-}

  • Option 2)

    CN^{-}

  • Option 3)

    SCN^{-}

  • Option 4)

    CO

 
As we learnt in  Types of Ligands on the basis of Connectivity - (i) Unidentate - ligand is bound to metal ion through a single donor atom. eg:  (ii) Bidentate : when ligand can bind through two donor atoms eg:  (iii) Polydentate - when ligand bind to two or more donor atoms (iv) Hexadentate - type of polydentate having six donor atoms (v) Ambidentate- which can ligate through two different...
Engineering
101 Views   |  

Which has maximum conductance in water?

  • Option 1)

    \left [ Co (NH_{3}) _{3} Cl _{3}\right ]

  • Option 2)

  • Option 3)

  • Option 4)

 
As we learnt in  Coordination Sphere - The central atom/ion and the ligands attached to metal are enclosed in square bracket and this collectively termed as coordination sphere - wherein eg:   Counter ion   Coordination sphere     All the entities in the coordination sphere will not break down further.  Therefore, Vant's Hoff factor will be 1+ entities outside the coordination sphere...
Engineering
135 Views   |  

The d_{4} ions , in octahedral field of weak field ligands will have configuration

  • Option 1)

    t2g4e0g

  • Option 2)

    t2g2e2g

  • Option 3)

    t2g3e1g

  • Option 4)

    t2g1e3g

 
As we learnt in  Weak field Ligand - These are the ligands which do not pair the electron in inner d-orbital. - wherein For example:  etc       In Octahedral field of d4 electrons, in case of weak field Ligands, we have    Option 1) t2g4e0g This option is incorrect  Option 2) t2g2e2g This option is incorrect  Option 3) t2g3e1g This option is correct  Option 4) t2g1e3g This option is incorrect 
Engineering
122 Views   |  

The solid PCl_{5}  exists as

  • Option 1)

    PCl_{3}

  • Option 2)

    PCl_{4}^{+}

  • Option 3)

    PCl_{6}^{-}

  • Option 4)

    PCl_{4}^{+}\, \, and\, \, PCl_{6}^{-}

 
As we learnt in  Structure of phosphorus pentachloride - Trigonal bipyramidal structure (liquid and gas). In solid state as is tetrahedral and  is octahedral. - wherein       In solid state Phosphorus Pentochloride exists as  is thetrahedral and  is Octahedral.      Option 1) This option is incorrect  Option 2) This option is incorrect  Option 3) This option is incorrect  Option 4) This...
Engineering
132 Views   |  

The reaction between copper and hot concentrated sulfuric acid produces :

  • Option 1)

    So_{2}

  • Option 2)

    So_{3}

  • Option 3)

    H_{2}

  • Option 4)

    Cu^{+} ions

 
As we learnt in  Preparation of Sulfur dioxide - In laboratory, it is prepared by heating copper turnings with conc.H2So4 - wherein Cu+2H2SO4+SO2+2H2O   Sulphur dioxide is produced in the laboratory by heating copper turnings with conc. H2SO4  Cu+ 2H2SO4  +SO2+2H2O Option 1) This option is correct  Option 2) This option is incorrect  Option 3) This option is incorrect  Option 4) This...
Engineering
117 Views   |  

The oxidation number of Pt in [Pt(C_{2}H_{4}) Cl_{3}]^{-}is

  • Option 1)

    +1

  • Option 2)

    +2

  • Option 3)

    +3

  • Option 4)

    +4

 
As we learnt in  Oxidation number - It is represented by roman numeral in parenthesis following the name of coordination entity. - wherein Eg.  x-4 = -2 x= 2     Let X be the oxidation number of Pt X + (-3) = -1 X = +2   Option 1) +1 This option is incorrect  Option 2) +2 This option is correct  Option 3) +3 This option is incorrect  Option 4) +4 This option is incorrect 
Engineering
94 Views   |  

The number of valence electrons in the members of nitrogen family is 

  • Option 1)

    2

  • Option 2)

    3

  • Option 3)

    4

  • Option 4)

    5

 
As we learnt in Electronic configuration of nitrogen family - -   Electronic Configuration:   No. of valence electrons is each element = 2+3=5   Option 1) 2 This option is incorrect Option 2) 3 This option is incorrect Option 3) 4 This option is incorrect Option 4) 5 This option is correct
Engineering
100 Views   |  

The number of unpaired d - electrons in the central atom of Complex \left [ Cr(H_{2}O)_{6} \right ]^{3+} 

is (Atomic number of H=1)

  • Option 1)

    2

  • Option 2)

    4

  • Option 3)

    3

  • Option 4)

    5

 
As we learnt in  Weak field Ligand - These are the ligands which do not pair the electron in inner d-orbital. - wherein For example:  etc           Electronic configuration of Cr3+ : 3d3 4s0 H2O is a weak field Ligand Therefore we have      Option 1) 2 This option is incorrect  Option 2) 4 This option is incorrect  Option 3) 3 This option is correct  Option 4) 5 This option is incorrect 
Engineering
262 Views   |  

The most electronegative element amongst group 15 members is

  • Option 1)

    Phosphorous 

  • Option 2)

    Arsenic

  • Option 3)

    Antimony

  • Option 4)

    Nitrogen

 
As we learnt in  Electronegativity of Nitrogen family - Gradually decreases down the group. More electronegative than group 14 -   Electronegativity of elements in group 15 decreases as we go down the group. So, Nitrogen has the highest electronegativity in the group.   Option 1) Phosphorous  This option is incorrect Option 2) Arsenic This option is incorrect Option 3) Antimony This option is...
Engineering
364 Views   |  

The maximum bond angle in the hydrides of group 16 elements is in

  • Option 1)

    H_{2}O

  • Option 2)

    H_{2}T_{e}

  • Option 3)

    H_{2}S_{e}

  • Option 4)

    H_{2}S

 
As we learnt in  Bond angle of hydrides of oxygen family - All these hydrides are angular melocules and the bond angle H-X-H (X is O,S,Se,Te)  decreases from H2O to H2Te -   The bond angle in the hydrides of the group 16 decreases as we go down the group. As electronegativity falls down the group, the tendency of the central atom to attract bond pair of electrons falls thus making lone pair -...
Engineering
144 Views   |  

The IUPAC name of K_{4}[Fe(CN)_{6}] is

  • Option 1)

    Potassium Hexacyanoferrate (II)

  • Option 2)

    Potassium Ferricyanide

  • Option 3)

    Potassium Hexacyanoferrate (III)

  • Option 4)

    Prussian Blue

 
As we learnt in  Writing the name of Complex compound formula - (i) Cation is named first  (ii) ligands are named in alphabetical order before name of central metal atom. (iii) Prefixes, mono, di, tri are used to indicate the no of ligands (iv) when name of ligand used a numerical prefix, then term bix, tris, tetrakis are used. eg: is named as dichlorobis (triphenylphosphine)nickel(II) (v)...
Engineering
316 Views   |  

The formula dichloridobis (urea) copper (II) is

  • Option 1)

    \left [Cu\left \{0=(CNH_{2})_{2} \right \} \right ] Cl_{2}

  • Option 2)

    \left [Cu\:\:Cl_{2} \left \{O=C(NH_{2})_{2} \right \}_{2}\right ]

  • Option 3)

    \left [Cu\left \{0=C(NH_{2})_{2} \right \}Cl \right ]Cl

  • Option 4)

    \left [ Cu\:\:Cl_{2} \right ] \left [ 0=C(NH_{2})_{2} \right H_{2}]

 
As we learnt in  Writing the name of Complex compound formula - (i) Cation is named first  (ii) ligands are named in alphabetical order before name of central metal atom. (iii) Prefixes, mono, di, tri are used to indicate the no of ligands (iv) when name of ligand used a numerical prefix, then term bix, tris, tetrakis are used. eg: is named as dichlorobis (triphenylphosphine)nickel(II) (v)...
Exams
Articles
Questions