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Medical
4 days, 18 hours ago

Pinus seed cannot germinate and establish without fungal associaton. This is because:

  • Option 1)

    its embryo is immature

  • Option 2)

    it has obligate association with mycorrhizae

  • Option 3)

    it has a very hard seed coat

  • Option 4)

    its seed contain inhibitors that prevents germinatiom.

     

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A aadil.khan
Answered 3 days, 18 hours ago
  Mycorrhiza - Mycorrhiza is a symbiotic association of a fungus with a root system. The fungi is extremely helpful for water and mineral absorption for the plants. Pinus seed have obligate association with mycorrhizae. They germinate only in the presence of fungus. -     Mycorrhiza is a symbiotic association of a fungus with a root system. The fungi is extremely helpful for water and mineral...
Medical
4 days, 18 hours ago

In which case change in entropy is negative?

  • Option 1)

    Evapouration of water

  • Option 2)

    Expansion of a gas at constant temperature

  • Option 3)

    Sublimation of solid to gas

  • Option 4)

    2H_{(g)} \rightarrow H_2_{(g)}

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P Plabita
Answered 3 days, 18 hours ago
  Gibb's free energy (? G) -   - wherein Gibb's free energy enthalpy of reaction entropy temperature       degree of randomness decreases  entropy decreases and is negative.Option 1)Evapouration of waterOption 2)Expansion of a gas at constant temperatureOption 3)Sublimation of solid to gasOption 4)
Medical
4 days, 18 hours ago

Drug called 'Heroin' is synthesized by:

 

  • Option 1)

    methylation of morphine

  • Option 2)

    acetylation of morphine

  • Option 3)

    glycosylation of morphine

  • Option 4)

    nitration of morphine

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A aadil.khan
Answered 3 days, 18 hours ago
  Heroin - Commonly called smack is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound. - wherein   This is obtained by acetylation of morphine, which is extracted from the latex of poppy plant Papaver somniferum Generally taken by snorting and injection, heroin is a depressant and slows down body functions.      Herion is a chemically diacetylmorphine...
Medical
4 days, 18 hours ago

Which of the following equipments is essentially required for growing microbes on a large scale, for industrial production of enzymes?

 

  • Option 1)

    BOD incubator

  • Option 2)

    sludge digestor 

  • Option 3)

    Industrial oven

  • Option 4)

    Bioreactor

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P Plabita
Answered 3 days, 18 hours ago
  Bioreactors - Bioreactors are stirrer cylindrical tanks. The stirrer provides movement, even mixing and O2 availability throughout the bioreaction. - wherein Bioreactors can be 100 to 1000 lt for large production.       In order to produce large quantities of the enzymes , bioreactors are used wherein large volumers of culture can be processed or provides optimal conditions for achieving...
Medical
4 days, 18 hours ago

Which of the following muscular disorder is inherited?

 

  • Option 1)

    Tetany

  • Option 2)

    Muscular dystrophy

  • Option 3)

    Myasthenia gravis

  • Option 4)

    Botulism

 

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V Vakul Arora
Answered 3 days, 18 hours ago
  Myasthenia gravis - Myasthenia gravis is a chronic autoimmune neuromuscular disease that causes weakness in the skeletal muscles, which are responsible for breathing and moving parts of the body, including the arms and legs. , myasthenia gravis is not inherited and occurs in people with no history of the disorder in their family. -     Tetany is the condition of involuntary muscular...
Medical
1 week, 4 days ago

Match the following:

(a) Pure Nitrogen                (i) Chlorine

(b) Haber process              (ii) Sulphuric Acid

(c) Contact process           (iii) Ammonia

(d) Deacon's process        (iv) Sodium azide or Barium Azide

Which of the following is the correct option?

(a)    (b)    (c)    (d)

  • Option 1)

    (i)    (ii)    (iii)    (iv)

  • Option 2)

    (ii)    (iv)    (i)    (iii)

  • Option 3)

    (iii)    (iv)    (ii)    (i)

  • Option 4)

    (iv)    (iii)    (ii)    (i)

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V Vakul Arora
Answered 1 week, 3 days ago
Option 4 a) Pure Nitrogen  Sodium azide  or Barium azide  b) Haber process  Making ammonia                                        c) Contact process  producing sulphuric acid  d) Deacon's process  Pruduces  gas                                              Option 1)(i)    (ii)    (iii)    (iv)Option 2)(ii)    (iv)    (i)    (iii)Option 3)(iii)    (iv)    (ii)    (i)Option 4)(iv)    (iii)    (ii)    (i)
Medical
1 week, 4 days ago

The mixture that forms maximum boiling azeotrope is:

  • Option 1)

    Water + Nitric Acid

  • Option 2)

    Ethanol + Water

  • Option 3)

    Acetone + Carbon disulphide

  • Option 4)

    Heptane + Octane

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P Plabita
Answered 1 week, 3 days ago
The Solutions that show large negative deviation from Raoult's law from maximum boiling azeotrope at a specific combination. Nitric acid and water is the example of this class of azeotrope.  68% Nitric acid + 32% by mass with a boiling point of 393.5 K.    Option 1)Water + Nitric AcidOption 2)Ethanol + WaterOption 3)Acetone + Carbon disulphideOption 4)Heptane + Octane
Medical
1 week, 4 days ago

Among the following, the one that is not a greenhouse gas is:

  • Option 1)

    nitrous oxide

  • Option 2)

    methane

  • Option 3)

    ozone

  • Option 4)

    sulphur dioxide

 

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S solutionqc
Answered 1 week, 3 days ago
N2O (Nitrous oxide) CH4 (Methane) O3 (Ozone) All the above are greenhouse gases but SO2  is not greenhouse gas.  Option 1) nitrous oxide Option 2) methane Option 3) ozone Option 4) sulphur dioxide
Medical
1 week, 4 days ago

The correct structure of tribromooctaoxide is:

 

  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)

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K Kallem Alekya
Answered 1 week, 3 days ago

option 1 ,because it is not an ion

Medical
1 week, 4 days ago

The number of sigma (\sigma) and pi(\pi) bonds in pent-2-en-4-yne is:

  • Option 1)

    10 \sigma bonds and 3 \pi bonds

  • Option 2)

    \sigma bonds and 5 \pi bonds

  • Option 3)

    11 \sigma bonds and 2 \pi bonds

  • Option 4)

    13 \sigma bonds and no \pi bonds

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V Vakul Arora
Answered 1 week, 3 days ago
Option 1 Structure of pent-2-en-4-yne Here there are 10  bonds  and  bonds And 3  bonds   and Option 1)10  bonds and 3  bondsOption 2)8  bonds and 5  bondsOption 3)11  bonds and 2  bondsOption 4)13  bonds and no  bonds
Medical
1 week, 4 days ago

An alkane "A" on reaction with O3 and Zn-H2O gives propane and ethanal in equimolar ratio. Addition of HCl to Alkane "A" gives "B" as the major product. The structure of the product "B" is

  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)

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S solutionqc
Answered 1 week, 3 days ago
This oxidation of alkene occurs at the double bond. Thus, propane & ethanol must combine to give the alkene             (Propanone)                                                                                                       Now this reacts with HCl to form B as follows:                                                                         ...
Medical
1 week, 4 days ago

Which of the following acts as a circuit protection device ? 

 

  • Option 1)

    conductor 

  • Option 2)

    inductor 

  • Option 3)

    switch 

  • Option 4)

    fuse 

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P Plabita
Answered 1 week, 3 days ago
fuse Option 1)conductor Option 2)inductor Option 3)switch Option 4)fuse 
Medical
1 week, 4 days ago

In which of the following devices , the eddy current  effect is not used ? 

 

  • Option 1)

    induction furnace 

  • Option 2)

    magnetic braking in train 

  • Option 3)

    electromagnet 

  • Option 4)

    electric heater 

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P Plabita
Answered 1 week, 3 days ago
electric heater Option 1)induction furnace Option 2)magnetic braking in train Option 3)electromagnet Option 4)electric heater 
Medical
1 week, 4 days ago

Match the Xenon compound in Column-I with its structure in Column-II and assign the correct code:

Column-I                        Column-II

(a) XeF4                            (i) pyramidal

(b) XeF6                            (ii) Square planar

(c) XeOF4                        (iii) distorted octahedral

(d) XeO3                          (iv) square pyramidal

Code:

            (a)     (b)     (c)     (d)

 

  • Option 1)

    (i)     (ii)     (iii)     (iv)

  • Option 2)

    (ii)      (iii)     (iv)     (i)

  • Option 3)

    (ii)     (iii)     (i)     (iv)

  • Option 4)

    (iii)     (iv)     (i)     (ii)

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S solutionqc
Answered 1 week, 3 days ago
XeF4  it is square planar. XeF6  it is distorted octahedral because of the lone pair present. XeOF4  Its is square pyramidal & its hybridization is sp3d2 XeO3  Its hybridization is sp3 & its shape is pyramidal.  (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i) Option 2 is correct.Option 1)(i)     (ii)     (iii)     (iv)Option 2)(ii)      (iii)     (iv)     (i)Option 3)(ii)     (iii)     (i)   ...
Medical
1 week, 4 days ago

Pick the wrong answer in the context with rainbow 

 

  • Option 1)

    When the light rays undergo two internal  reflection in a water drop , a secondary rainbow is formed 

  • Option 2)

    The order of colors is reversed in the secondary rainbow 

  • Option 3)

    An observer can see a rainbow when his front is towards the sun 

  • Option 4)

    Rainbow is a combined effect of dispersion , refreaction and reflection of sunlight 

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S solutionqc
Answered 1 week, 3 days ago
Rainbow can seen when back is towards the Sun.Option 1)When the light rays undergo two internal  reflection in a water drop , a secondary rainbow is formed Option 2)The order of colors is reversed in the secondary rainbow Option 3)An observer can see a rainbow when his front is towards the sun Option 4)Rainbow is a combined effect of dispersion , refreaction and reflection of sunlight 
Medical
1 week, 4 days ago

A particle moving with velocity \vec V is acted by three forces shown by the vector triangle PQR . The velocity of the particle will : 

 

  • Option 1)

    increase 

  • Option 2)

    derease 

  • Option 3)

    remain constant 

  • Option 4)

    change acording to the smallest force QR 

 

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V Vakul Arora
Answered 1 week, 3 days ago
Option 1) increase  Option 2) derease  Option 3) remain constant  Option 4) change acording to the smallest force QR 
Medical
1 week, 4 days ago

Which mixture of the solution will lead to the formation of negatively charged colloidal [AgI]I^- sol. ?

  • Option 1)

    50 mL of 1 M AgNO_3 + 50 mL of 1.5 M KI

  • Option 2)

    50 mL of 1 M AgNO_3 + 50 mL of 2 M KI

  • Option 3)

    50 mL of 2 M AgNO_3 + 50 mL of 1.5 M KI

  • Option 4)

    50 mL of 0.1 M AgNO_3 + 50 mL of 0.1 M KI

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P Plabita
Answered 1 week, 3 days ago
Option 2                     Negatively charged colloidal  need 2 mol of   Option 1)50 mL of 1 M  + 50 mL of 1.5 M Option 2)50 mL of 1 M  + 50 mL of 2 M Option 3)50 mL of 2 M  + 50 mL of 1.5 M Option 4)50 mL of 0.1 M  + 50 mL of 0.1 M 
Medical
1 week, 4 days ago

Which of the following is incorrect statement?

  • Option 1)

    PbF4 is covalent in nature

  • Option 2)

    SiCl4 is easily hydrolysed

  • Option 3)

    GeX4 (X = F, Cl, Br, I) is more stable than GeX2

  • Option 4)

    SnF4 is ionic in nature

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S solutionqc
Answered 1 week, 3 days ago
(i) PbF4 is not covalent in nature. Because Pb atom is very & F atom is very small, so according to Fajan's rule, PbF4 is not covalent. (ii) SiCl4 is not a very stable compound because of steric hindrance thus can be hydrolysed very easily (iii) GeX4 is more stable than GeX2 as in GeX4 all the orbitals are fully filled.  (iv) SnF4 is ionic in nature. Because F atom is very small & Sn atom is...
Medical
1 week, 4 days ago

Two parallel infinite line charges with linear charges densities + \lambda C/ m \: \: and \: \: - \lambda C/ m are placed at a distance  of 2R in free space . what is the electric field mid way between the two line charges ? 

  • Option 1)

    zero

  • Option 2)

    \frac{2 \lambda }{\pi \epsilon _0 R} N/C

  • Option 3)

    \frac{ \lambda }{\pi \epsilon _0 R} N/C

  • Option 4)

    \frac{\lambda }{2\pi \epsilon _0 R} N/C

 

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V Vakul Arora
Answered 1 week, 3 days ago
Option 1) zero Option 2) Option 3) Option 4)
Medical
1 week, 4 days ago

What is the correct electronic configuration of the central atom in K_6[Fe(CN)_6] based on crystal field theory?

  • Option 1)

    t_{2g}^4e_{g}^2

  • Option 2)

    t_{2g}^6e_{g}^0

  • Option 3)

    e^3t_2^3

  • Option 4)

    e^4t_2^2

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S solutionqc
Answered 1 week, 3 days ago
Splitting occurs as follows for octahedral For Fe2+ (d6), electron distribution occurs as follows:  is the correct distribution. Option 2 is correct.  Option 1)Option 2)Option 3)Option 4)
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