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Engineering
3 days, 23 hours ago

A solution containing a group-IV cation gives a precipitate on passing H2S.  A solution of this precipitate in dil.HCl produces a white precipitate with NaOH solution and bluish-white precipitate with basic potassium ferrocyanide.  The cation is :

  • Option 1)

    Co2+

  • Option 2)

    Ni2+

  • Option 3)

    Mn2+

  • Option 4)

    Zn2+

     

 

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S solutionqc
Answered 2 days, 23 hours ago
Option 1) Co2+ Option 2) Ni2+ Option 3) Mn2+ Option 4) Zn2+  
Engineering
3 days, 23 hours ago

 The number of S=O and S−OH bonds present in peroxodisulphuric acid and pyrosulphuric acid respectively are :

  • Option 1)

     (2 and 2) and (2 and 2)

  • Option 2)

     (2 and 4) and (2 and 4)

  • Option 3)

     (4 and 2) and (2 and 4)

  • Option 4)

     (4 and 2) and (4 and 2)

     

 

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S solutionqc
Answered 2 days, 23 hours ago
Option 1)  (2 and 2) and (2 and 2) Option 2)  (2 and 4) and (2 and 4) Option 3)  (4 and 2) and (2 and 4) Option 4)  (4 and 2) and (4 and 2)  
Engineering
3 days, 23 hours ago

A metal ‘M’ reacts with nitrogen gas to afford ‘M3N’. ‘M3N’ on heating at high temperature gives back ‘M’ and on reaction with water produces a gas ‘B’.  Gas ‘B’ reacts with an aqueous solution of CuSO4 to form a deep blue compound.  ‘M’ and ‘B’ respectively are :

  • Option 1)

     Li and NH3

  • Option 2)

     Ba and N2

  • Option 3)

    Na and NH3

  • Option 4)

    Al and N2

     

 

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S solutionqc
Answered 2 days, 23 hours ago
Option 1)  Li and NH3 Option 2)  Ba and N2 Option 3) Na and NH3 Option 4) Al and N2  
Engineering
3 days, 23 hours ago

Consider the following standard electrode potentials (E0 in volts) in aqueous solution :

Based on these data, which of the following statements is correct ?

  • Option 1)

    Tl+ is more stable than Al3+

  • Option 2)

    Al+ is more stable than Al3+

  • Option 3)

     Tl+ is more stable than Al+

  • Option 4)

    Tl3+ is more stable than Al3+

     

 

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S solutionqc
Answered 2 days, 23 hours ago
Option 1) Tl+ is more stable than Al3+ Option 2) Al+ is more stable than Al3+ Option 3)  Tl+ is more stable than Al+ Option 4) Tl3+ is more stable than Al3+  
Engineering
3 days, 23 hours ago

 Consider the following ionization enthalpies of two elements ‘A’ and ‘B’.

Which of the following statements is correct ?

 

  • Option 1)

     Both ‘A’ and ‘B’ belong to group-1 where ‘B’ comes below ‘A’.

  • Option 2)

    Both ‘A’ and ‘B’ belong to group-1 where ‘A’ comes below ‘B’.

  • Option 3)

     Both ‘A’ and ‘B’ belong to group-2 where ‘B’ comes below ‘A’.

  • Option 4)

    Both ‘A’ and ‘B’ belong to group-2 where ‘A’ comes below ‘B’.

     

 

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S solutionqc
Answered 2 days, 23 hours ago
Option 1)  Both ‘A’ and ‘B’ belong to group-1 where ‘B’ comes below ‘A’. Option 2) Both ‘A’ and ‘B’ belong to group-1 where ‘A’ comes below ‘B’. Option 3)  Both ‘A’ and ‘B’ belong to group-2 where ‘B’ comes below ‘A’. Option 4) Both ‘A’ and ‘B’ belong to group-2 where ‘A’ comes below ‘B’.  
Engineering
3 days, 23 hours ago

 In which of the following reactions, hydrogen peroxide acts as an oxidizing agent ?

  • Option 1)

     HOCl + H2O2 → H3O+ + Cl + O2

  • Option 2)

    I2 + H2O2 + 2OH → 2I + 2H2O+O2

  • Option 3)

    2MnO-4 +3H2O2 →2MnO2 + 3O2+2H2O+2OH-  

  • Option 4)

     PbS+4H2O2 → PbSO4+4H2O

 

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S solutionqc
Answered 2 days, 23 hours ago
Option 1)  HOCl + H2O2 → H3O+ + Cl− + O2 Option 2) I2 + H2O2 + 2OH− → 2I− + 2H2O+O2 Option 3) 2MnO-4 +3H2O2 →2MnO2 + 3O2+2H2O+2OH-   Option 4)  PbS+4H2O2 → PbSO4+4H2O
Engineering
3 days, 23 hours ago

 Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal.

  • Option 1)

     O3 and CO2

  • Option 2)

     CO2 and NO2

  • Option 3)

    SO2 and NO2

  • Option 4)

    SO2 and O3

     

 

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S solutionqc
Answered 2 days, 23 hours ago
Option 1)  O3 and CO2 Option 2)  CO2 and NO2 Option 3) SO2 and NO2 Option 4) SO2 and O3  
Engineering
3 days, 23 hours ago

 sp3d2 hybridization is not displayed by :

  • Option 1)

     BrF5

  • Option 2)

     SF6

  • Option 3)

    [CrF6]3−

  • Option 4)

     PF5

     

 

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S solutionqc
Answered 2 days, 23 hours ago
Option 1)  BrF5 Option 2)  SF6 Option 3) [CrF6]3− Option 4)  PF5  
Engineering
3 days, 23 hours ago

The pair of compounds having metals in their highest oxidation state is :

  • Option 1)

        MnO2 and CrO2Cl2

  • Option 2)

     [NiCl4]2− and [CoCl4]2−

  • Option 3)

     [Fe(CN)6]3− and [Cu(CN)4]2−

  • Option 4)

    [FeCl4] and Co2O3

     

 

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S solutionqc
Answered 2 days, 23 hours ago
Option 1)     MnO2 and CrO2Cl2 Option 2)  [NiCl4]2− and [CoCl4]2− Option 3)  [Fe(CN)6]3− and [Cu(CN)4]2− Option 4) [FeCl4]− and Co2O3  
Engineering
3 days, 23 hours ago

Which of the following is paramagnetic ?

  • Option 1)

    NO+

  • Option 2)

     CO

     

  • Option 3)

     O _{2}^{2-}

  • Option 4)

    B2

 

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S SudhirSol
Answered 2 days, 23 hours ago
Option 1) NO+ Option 2)  CO   Option 3)   Option 4) B2
Engineering
3 days, 23 hours ago

The rate of a reaction A doubles on increasing the temperature from 300 to 310 K.  By how much, the temperature of reaction B should be increased from 300 K so that rate doubles if activation energy of the reaction B is twice to that of reaction A.

  • Option 1)

    9.84 K

  • Option 2)

     4.92 K

  • Option 3)

     2.45 K

  • Option 4)

    19.67 K

     

 

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S SudhirSol
Answered 2 days, 23 hours ago
Option 1) 9.84 K Option 2)  4.92 K Option 3)  2.45 K Option 4) 19.67 K  
Engineering
1 week, 4 days ago

For current entering at A, the electric field at a distance ‘r’ from A is

  • Option 1)

    \frac{\rho l}{8\pi r^2}

  • Option 2)

    \frac{\rho l}{ r^2}

  • Option 3)

    \frac{\rho l}{2\pi r^2}

  • Option 4)

    \frac{\rho l}{4\pi r^2}

 

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S solutionqc
Answered 1 week, 3 days ago
Option 1) Option 2) Option 3) Option 4)
Engineering
1 week, 4 days ago

A student measures the focal length of convex lens by putting an object pin at a distance ‘u’ from the
lens and measuring the distance ‘v’ of the image pin. The graph between ‘u’ and ‘v’ plotted by the
student should look like

  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)

 

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S SANDEEP KUMAR
Answered 1 week, 2 days ago

4

Engineering
1 week, 4 days ago

The quadratic equations x2 - 6x + a = 0  and x- cx + 6 = 0  have one root in common. The other roots
of the first and second equations are integers in the ratio 4 : 3. Then the common root is

  • Option 1)

    1

  • Option 2)

    4

  • Option 3)

    3

  • Option 4)

    2

 

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C chaudhari vipul
Answered 1 week, 1 day ago

option3

Engineering
1 week, 4 days ago

A particle just clears a wall of height b at a
distance a and strikes the ground at a distance c
from the point of projection. The angle of
projection is

  • Option 1)

    tan^-(\frac{bc}{a*(c-a)})

  • Option 2)

    tan^-(\frac{bc}{a })

  • Option 3)

    tan^-(\frac{b}{a*c})

  • Option 4)

    45^0

 

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I isk
Answered 1 week, 3 days ago

2

Engineering
1 week, 4 days ago

A body weighing 13 kg is suspended by two
strings 5m and 12m long, their other ends being
fastened to the extremities of a rod 13m long. If
the rod be so held that the body hangs
immediately below the middle point, then
tensions in the strings are

  • Option 1)

    5 kg and 12 kg

  • Option 2)

    5 kg and 13 kg

  • Option 3)

    12 kg and 13 kg

  • Option 4)

    5 kg and 5 kg

 

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S solutionqc
Answered 1 week, 3 days ago
Option 1) 5 kg and 12 kg Option 2) 5 kg and 13 kg Option 3) 12 kg and 13 kg Option 4) 5 kg and 5 kg
Engineering
1 week, 4 days ago

Which of the following species exhibits the
diamagnetic behaviour ?

  • Option 1)

    NO

  • Option 2)

    {O_{2}}^{2-}

  • Option 3)

    {O_{2}}^{+}

  • Option 4)

     O_2

 

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S solutionqc
Answered 1 week, 3 days ago
Option 1) NO Option 2) Option 3) Option 4)  
Engineering
1 week, 4 days ago

Two lenses of power –15 D and +5 D are in
contact with each other. The focal length of the
combination is

  • Option 1)

    +10cm

  • Option 2)

    -20cm

  • Option 3)

    -10cm

  • Option 4)

    +20cm

 

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S solutionqc
Answered 1 week, 3 days ago
Option 1) +10cm Option 2) -20cm Option 3) -10cm Option 4) +20cm
Engineering
1 week, 4 days ago

A body falling from rest under gravity passes a certain point P. It was at a distance of 400 m from P, 4s prior to passing through P. If g = 10m/s^2 , then the height above the point P from where the body began to fall is

  • Option 1)

    720

  • Option 2)

    900

  • Option 3)

    320

  • Option 4)

    680

 

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S solutionqc
Answered 1 week, 3 days ago
Option 1) 720 Option 2) 900 Option 3) 320 Option 4) 680
Engineering
1 week, 4 days ago

Lanthanoid contraction is caused due to

  • Option 1)

    the appreciable shielding on outer electrons by 4f electrons from the nuclear charge

  • Option 2)

    the appreciable shielding on outer electrons by 5d electrons from the nuclear charge

  • Option 3)

    the same effective nuclear charge from Ce to Lu

  • Option 4)

    the imperfect shielding on outer electrons by 4f electrons from the nuclear charge

 

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S solutionqc
Answered 1 week, 3 days ago
Option 1) the appreciable shielding on outer electrons by 4f electrons from the nuclear charge Option 2) the appreciable shielding on outer electrons by 5d electrons from the nuclear charge Option 3) the same effective nuclear charge from Ce to Lu Option 4) the imperfect shielding on outer electrons by 4f electrons from the nuclear charge
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