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The electric field in a region is given by $\;\overrightarrow{E}=5 \hat{i} - 3 \hat {j}\;.$ Find $\;V_{B}-V_{A}\;.$ If A is origin & B is $\;(0,0,5)\;m$
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
What happens when a solution of potassium chromate is treated with excess dil. Nitric acid?
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
important-compounds
potassium-dichromate
medium
asked
Jan 29, 2014
by
sreemathi.v
1
answer
If the mean deviation of the numbers $ 1, 1+d, 1+2d......1+100d$ from their mean is $255$, then the $d$ is equal to
jeemain
math
cbse
class11
statistics
measures-of-dispersion-(mean)
difficult
q31
asked
Jan 29, 2014
by
thanvigandhi_1
1
answer
In lanthanides the differentiating electron enters into
lanthanides
f-block
easy
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
asked
Jan 29, 2014
by
sreemathi.v
1
answer
For the given elements and their atomic numbers, which of these have the highest second ionization enthalpy?
ionization-potential
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
general-properties
easy
asked
Jan 29, 2014
by
sreemathi.v
1
answer
An electric field $\;\overrightarrow{E}=(2 \hat{i}+3\hat{j})\;N/C$ exists in space . if the potential at the origin is zero , find the potential at $\;(2 ,2 )\;m$
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
Arrange La$^{3+}$, Pm$^{3+}$, Yb$^{3+}$ and Ce$^{3+}$ in order of increasing ionic radii
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
general-properties
easy
atomic-and-ionic-radii
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Which of the following ions has the maximum magnetic moment?
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
general-properties
easy
magnetic-properties
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Calculate the expected magnetic moment of a salt where Manganese is in the +II state?
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
general-properties
easy
magnetic-properties
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Two charge particles are placed at 1 m apart what is the minimum possible magnitude of electric force acting on each charge
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
Rare earth elements are generally called as
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
basics
easy
lanthanides
f-block
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Which of the following statements regarding the catalytic properties of transition metals are CORRECT?
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
general-properties
catalytic-properties
easy
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Which of the following transition elements are used in the preparation of $NH_3$ by haber's process?
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
general-properties
catalytic-properties
easy
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Equal charges q are placed at x=0,2,4,8 m on x axis . Find the $\;|force|\;$ experienced by the charge at x=2 m
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
Which of the following statements about iron is INCORRECT given that Iron exhibits +2 and + 3 oxidation states.
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
general-properties
oxidation-state
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Which of the following is an example of Disproportionation of an oxidation state, in which a single substance is simultaneously reduced and oxidized to form two different products one with a higher oxidation state and one with a lower oxidation state?
jeemain
chemistry
class12
d-and-f-block-elements
ch8
medium
inorganic-chemistry
general-properties
oxidation-state
asked
Jan 29, 2014
by
sreemathi.v
1
answer
What is the oxidation number of the transition metal in the complex ion [Co(H$_2$O)$_5$Cl]$^{+}$?
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
general-properties
oxidation-state
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The main reason d-block elements exhibit a large number of oxidation states compared to f-block elements is because:
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
general-properties
oxidation-state
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Two point charges $\;q_{1}\;and\;q_{2}\;$ are placed on $\;x=-a\;and\;x=+a\;respectively\;.$ Find the relation between $\;q_{1}\;and\;q_{2}\;$ so that the net electric field at $\;x=+\large\frac{a}{2}\;$ is zero
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field-due-to-multiple-charges
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
What is the oxidation state of Cobalt in CoBr$_2$?
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
general-properties
oxidation-state
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The transition element which does not show variable oxidation state is
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
general-properties
oxidation-state
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Highest oxidation state exhibited by a 3d-metal is
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
general-properties
oxidation-state
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Find the direction of electric field at point P for the charge distribution as shown in figure
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
continuous-charge-distribution
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
If a body is charged by rubbing it , its weight
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-charge
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
What is the oxidation state of Fe in FeCl$_3$?
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
general-properties
oxidation-state
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Which of the following salts are colourless?
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
general-properties
coloured-and-colourless-ions
easy
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The electronic configuration of divalent cation of Eu is
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
electron-configuration
easy
f-block
lanthanides
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Which of the following is a lanthanide element?
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
electron-configuration
easy
f-block
basics
lanthanides
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The most common oxidation states of Gold are:
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
general-properties
oxidation-state
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Which of the following is a lanthanide?
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
electron-configuration
easy
f-block
basics
lanthanides
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The 2 most common oxidation states shown by cerium are
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
easy
general-properties
oxidation-state
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The electronic configuration of gadolinium is
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
electron-configuration
easy
asked
Jan 29, 2014
by
sreemathi.v
1
answer
A point charge q=12.5 $\mu $C is placed at origin . Find the electric field vector at the point $\;(4 , 3)$ .
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field-due-to-multiple-charges
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
Which of the following transition metal ions are colourless?
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
general-properties
coloured-and-colourless-ions
easy
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The color of a transition metal complex results from which of the following reasons?
jeemain
chemistry
inorganic-chemistry
class12
ch8
d-and-f-block-elements
general-properties
coloured-and-colourless-ions
easy
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The oxidation state of Ni in $Ni(CO)_4$ is
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
general-properties
oxidation-state
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Three point charges of each of charge q are placed on three vertices of a square of side "l" meter . Find the magnitude of electric field at the centre of the square .
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field-due-to-multiple-charges
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
Which of the following statements regarding transition elements is/are incorrect?
jeemain
chemistry
class12
d-and-f-block-elements
ch8
inorganic-chemistry
medium
electron-configuration
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Magnese exhibits oxidation states
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
oxidation-state
general-properties
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Identify the correct statement about the charges $\;q_{1} \;and\; q_{2}$
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-charge
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
How many 'd' electrons are present in $Cr^{+2}$ ion?
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
electron-configuration
asked
Jan 29, 2014
by
sreemathi.v
1
answer
At what separation should two equal charges 1.0 C be placed so that the force between then equals the weight of a 25 kg person ?
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
The changed name of kurchatovium
jeemain
chemistry
class12
d-and-f-block-elements
ch8
easy
inorganic-chemistry
basics
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The formula for calculating the Highest Oxidation State for a Transition metal can be given as follows: Number of Unpaired d-electrons + Two s-orbital electrons. This is true for all the transition metals except two. Which of the following two?
jeemain
chemistry
class12
d-and-f-block-elements
ch8
medium
inorganic-chemistry
general-properties
oxidation-state
asked
Jan 29, 2014
by
sreemathi.v
1
answer
Units of electric flux are
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-flux-and-dipole
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
The catalyst used in manufacture of $HNO_3$ is
jeemain
chemistry
class12
d-and-f-block-elements
ch8
inorganic-chemistry
applications
q2
easy
catalytic-properties
asked
Jan 29, 2014
by
sreemathi.v
1
answer
The following figure has two NOT gates and a NOR. What does it represent?
jeemain
physics
class12
unit19
ch14
q65
medium
logic-gates
semiconductor-electronics
asked
Jan 29, 2014
by
meena.p
1
answer
Liquid element(metal) among d-block is
jeemain
chemistry
class12
d-and-f-block-elements
ch8
q1
basics
inorganic-chemistry
asked
Jan 29, 2014
by
sreemathi.v
1
answer
When the separation between two charges is increased the electric potential energy of the charges
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
Which of the gate is represented by
jeemain
physics
class12
unit19
ch14
q64
easy
logic-gates
semiconductor-electronics
concepts
asked
Jan 29, 2014
by
meena.p
1
answer
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