NEW
New Website Launch
Experience the best way to solve previous year questions with mock tests (very detailed analysis), bookmark your favourite questions, practice etc...

## Numerical

More
Metal $$\mathrm{M}$$ crystallizes into a fcc lattice with the edge length of $$4.0 \times 10^{-8} \mathrm{~cm}$$. The at...
JEE Main 2022 (Online) 28th July Evening Shift
An element M crystallises in a body centred cubic unit cell with a cell edge of $$300 \,\mathrm{pm}$$. The density of th...
JEE Main 2022 (Online) 28th July Morning Shift
100 mL of 0.3 M acetic acid is shaken with 0.8 g of wood charcoal. The final concentration of acetic acid in the solutio...
JEE Main 2022 (Online) 30th June Morning Shift
Atoms of element X form hcp lattice and those of element Y occupy $${2 \over 3}$$ of its tetrahedral voids. The percenta...
JEE Main 2022 (Online) 24th June Morning Shift
When 200 mL of 0.2 M acetic acid is shaken with 0.6 g of wood charcoal, the final concentration of acetic acid after ads...
JEE Main 2022 (Online) 24th June Evening Shift
The distance between Na+ and Cl$$-$$ ions in solid NaCl of density 43.1 g cm$$-$$3 is _______________ $$\times$$ 10$$-$$...
JEE Main 2022 (Online) 25th June Morning Shift
In a solid AB, A atoms are in ccp arrangement and B atoms occupy all the octahedral sites. If two atoms from the opposit...
JEE Main 2022 (Online) 26th June Evening Shift
Metal deficiency defect is shown by Fe0.93O. In the crystal, some Fe2+ cations are missing and loss of positive charge i...
JEE Main 2022 (Online) 27th June Morning Shift
If the initial pressure of a gas is 0.03 atm, the mass of the gas adsorbed per gram of the adsorbent is ___________ $$... JEE Main 2022 (Online) 27th June Evening Shift The empirical formula for a compound with a cubic close packed arrangement of anions and with cations occupying all the ... JEE Main 2021 (Online) 31st August Evening Shift CH4 is absorbed on 1g charcoal at 0$$^\circ$$C following the Freundlich adsorpiton isotherm 10.0 mL of CH4 is adsorbed a... JEE Main 2021 (Online) 31st August Evening Shift CO2 gas adsorbs on charcoal following Freundlich adsorption isotherm. For a given amount of charcoal, the mass of CO2 ad... JEE Main 2021 (Online) 27th July Morning Shift A copper complex crystallising in a CCP lattice with a cell edge of 0.4518 nm has been revealed by employing X-ray diffr... JEE Main 2021 (Online) 22th July Evening Shift Diamond has a three dimensional structure of C atoms formed by covalent bonds. The structure of diamond has face centred... JEE Main 2021 (Online) 20th July Evening Shift 100 ml of 0.0018% (w/v) solution of Cl$$-$$ion was the minimum concentration of Cl$$-$$required to precipitate a negat... JEE Main 2021 (Online) 20th July Evening Shift KBr is doped with 10$$-$$5 mole percent of SrBr2. The number of cationic vacancies in 1g of KBr crystal is ____________ ... JEE Main 2021 (Online) 17th March Evening Shift Ga (atomic mass 70 u) crystallizes in a hexagonal close packed structure. The total number of voids in 0.581 g of Ga is ... JEE Main 2021 (Online) 16th March Evening Shift A certain element crystallises in a bcc lattice of unit cell edge length 27$$\mathop A\limits^o $$. If the same element ... JEE Main 2021 (Online) 16th March Morning Shift The number of octahedral voids per lattice site in a lattice is _________. (Rounded off to the nearest integer) JEE Main 2021 (Online) 26th February Evening Shift The unit cell of copper corresponds to a face centered cube of edge length 3.596$$\mathop A\limits^o $$with one copper... JEE Main 2021 (Online) 25th February Evening Shift The coordination number of an atom in a body-centered cubic structure is _______. [Assume that the lattice is made up of... JEE Main 2021 (Online) 24th February Morning Slot For Freundlich adsorption isotherm, a plot of log (x/m) (y-axis) and log p (x-axis) gives a straight line. The intercept... JEE Main 2020 (Online) 6th September Evening Slot An element with molar mass 2.7$$ \times $$10-2 kg mol-1 forms a cubic unit cell with edge length 405 pm. If its densit... JEE Main 2020 (Online) 3rd September Morning Slot The mass of gas adsorbed, x, per unit mass of adsorbate, m, was measured at various pressures, p. A graph between$$\log...
JEE Main 2020 (Online) 2nd September Morning Slot

More
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R Assertion A : Thin ...
JEE Main 2022 (Online) 28th July Evening Shift
An element X has a body centred cubic (bcc) structure with a cell edge of 200 pm. The density of the element is 5 g cm$$... JEE Main 2022 (Online) 30th June Morning Shift Two statements are given below : Statement I : The melting point of monocarboxylic acid with even number of carbon atoms... JEE Main 2022 (Online) 24th June Morning Shift Given below are two statements : Statement I : Emulsions of oil in water are unstable and sometimes they separate into t... JEE Main 2022 (Online) 24th June Morning Shift Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographi... JEE Main 2022 (Online) 28th June Morning Shift The incorrect statement about the imperfections in solids is : JEE Main 2022 (Online) 28th June Morning Shift Select the graph that correctly describes the adsorption isotherms at two temperatures T1, and T2 (T1 &gt; T2) for a gas... JEE Main 2021 (Online) 31st August Morning Shift Given below are two statements.Statement I : Frenkel defects are vacancy as well as interstitial defects.Statement II : ... JEE Main 2021 (Online) 26th August Morning Shift Which one of the following is correct for the adsorption of a gas at a given temperature on a solid surface? JEE Main 2021 (Online) 26th August Morning Shift Select the correct statements(A) Crystalline solids have long range order.(B) Crystalline solids are isotropic(C) Amorph... JEE Main 2021 (Online) 27th July Evening Shift The parameters of the unit cell of a substance are a = 2.5, b = 3.0, c = 4.0,$$\alpha$$= 90$$^\circ$$,$$\beta$$= 120... JEE Main 2021 (Online) 27th July Morning Shift A hard substance melts at high temperature and is an insulator in both solid and in molten state. This solid is most lik... JEE Main 2021 (Online) 18th March Evening Shift In a binary compound, atoms of element A form a hcp structure and those of element M occupy 2/3 of the tetrahedral voids... JEE Main 2021 (Online) 18th March Morning Shift$${C_{12}}{H_{22}}{O_{11}} + {H_2}O\buildrel {Enzyme\,A} \over \longrightarrow \mathop {{C_6}{H_{12}}{O_6}}\limits_{Glu...
JEE Main 2021 (Online) 17th March Evening Shift
The nature of charge on resulting colloidal particles when FeCl3 is added to excess of hot water is :
JEE Main 2021 (Online) 26th February Evening Shift
Which one of the following statements is FALSE for hydrophilic sols?
JEE Main 2021 (Online) 25th February Evening Shift
In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption $$\left( {{x \over m}} \right)$$ is dir...
JEE Main 2021 (Online) 25th February Morning Slot
In Freundlich adsorption isotherm, slope of AB line is : ...
JEE Main 2021 (Online) 24th February Morning Slot
A crystal is made up of metal ions 'M1' and 'M2' and oxide ions. Oxide ions form a ccp lattice structure. The cation 'M1...
JEE Main 2020 (Online) 6th September Evening Slot
Kraft temperature is the temperature :
JEE Main 2020 (Online) 6th September Morning Slot
An element crystallises in a face-centred cubic (fcc) unit cell with cell edge $$a$$. The distance between the centres o...
JEE Main 2020 (Online) 5th September Evening Slot
Adsorption of a gas follows Freundlich adsorption isotherm. If x is the mass of the gas adsorbed on mass m of the adsorb...
JEE Main 2020 (Online) 5th September Evening Slot
A diatomic molecule X2 has a body-centred cubic (bcc) structure with a cell edge of 300 pm. The density of the molecule...
JEE Main 2020 (Online) 5th September Morning Slot
An Ellingham diagram provides information about :
JEE Main 2020 (Online) 5th September Morning Slot
A sample of red ink (a colloidal suspension) is prepared by mixing eosin dye, egg white, HCHO and water. The component w...
JEE Main 2020 (Online) 4th September Evening Slot
An ionic micelle is formed on the addition of :
JEE Main 2020 (Online) 3rd September Evening Slot
Tyndall effect is observed when:
JEE Main 2020 (Online) 3rd September Morning Slot
Amongst the following statements regarding adsorption, those that are valid are (a) $$\Delta$$H becomes less negative a...
JEE Main 2020 (Online) 2nd September Evening Slot
Which of the following is used for the preparation of colloids?
JEE Main 2020 (Online) 2nd September Morning Slot
A mixture of gases O2, H2 and CO are taken in a closed vessel containing charcoal. The graph that represents the correct...
JEE Main 2020 (Online) 9th January Evening Slot
For the following Assertion and Reason, the correct option is Assertion : For hydrogenation reactions, the catalytic act...
JEE Main 2020 (Online) 8th January Evening Slot
Which of the following compounds is likely to show both Frenkel and Schottky defects in its crystalline form?
JEE Main 2020 (Online) 8th January Evening Slot
As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order :
JEE Main 2020 (Online) 8th January Morning Slot
The ratio of number of atoms present in a simple cubic, body centered cubic and face centered cubic structure are, respe...
JEE Main 2019 (Online) 12th April Evening Slot
Among the following, the INCORRECT statement about colloids is :
JEE Main 2019 (Online) 12th April Evening Slot
An element has a face-centred cubic (fcc) structure with a cell edge of $$a$$. The distance between the centres of two n...
JEE Main 2019 (Online) 12th April Morning Slot
Peptization is a :
JEE Main 2019 (Online) 12th April Morning Slot
In chromatography, which of the following statements is incorrect for Rf ?
JEE Main 2019 (Online) 10th April Evening Slot
The correct option among the following is :
JEE Main 2019 (Online) 10th April Evening Slot
A gas undergoes physical adsorption on a surface and follows the given Freundlich adsorption isotherm equation $${x \ove... JEE Main 2019 (Online) 10th April Morning Slot 10 mL of 1mM surfactant solution forms a monolayer covering 0.24 cm2 on a polar substrate. If the polar head is approxim... JEE Main 2019 (Online) 9th April Evening Slot Match the catalysts (Column I) with products (Column II). .tg {border-collapse:collapse;border-spacing:0;width:100%} .... JEE Main 2019 (Online) 9th April Morning Slot The aerosol is a kind of colloid in which : JEE Main 2019 (Online) 9th April Morning Slot Consider the bcc unit cells of the solids 1 and 2 with the position of atoms as shown below. The radius of atom B is twi... JEE Main 2019 (Online) 8th April Evening Slot Element 'B' forms ccp structure and 'A' occupies half of the octahedral voids, while oxygen atoms occupy all the tetrahe... JEE Main 2019 (Online) 8th April Morning Slot Adsorption of a gas follows freundlich adosorbed isotherm. x is the mass of the gas adsorbed on mass m of the adsorbent.... JEE Main 2019 (Online) 8th April Morning Slot Among the following the false statement is - JEE Main 2019 (Online) 12th January Evening Slot Given .tg {border-collapse:collapse;border-spacing:0;border:none;} .tg td{font-family:Arial, sans-serif;font-size:14px... JEE Main 2019 (Online) 12th January Morning Slot Among the colloids cheese (C), milk (M), and smoke (S), the correct combination of the dispersed phase and dispersion me... JEE Main 2019 (Online) 11th January Evening Slot The radius of the largest sphere which fits properly at the centre of the edge of a body centred cubic unit cell is : (E... JEE Main 2019 (Online) 11th January Evening Slot A solid having density of 9$$ \times $$103 kg m–3 forms face centred cubic crystals of edge length$$200\sqrt 2 $$pm. W... JEE Main 2019 (Online) 11th January Morning Slot An example of solid sol is : JEE Main 2019 (Online) 11th January Morning Slot A compound of formula A2B3 has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids ... JEE Main 2019 (Online) 10th January Evening Slot Which premitive unit cell has unequal edge lengths (a$$ \ne $$b$$ \ne $$c) and all axial angles different from 90o ?... JEE Main 2019 (Online) 10th January Morning Slot At 100oC, copper (Cu) has FCC unit cell structure with cell edge length of x$$\mathop A\limits^o $$. What is the approx... JEE Main 2019 (Online) 9th January Evening Slot For coagulation of arsenious sulphate sol, which one of the following salt solution will be most effective ? JEE Main 2019 (Online) 9th January Evening Slot Adsorption of a gas follows Freundlich adsorption isotherm. In the given plot, x is the mass of the gas adsorbed on mass... JEE Main 2019 (Online) 9th January Morning Slot Which one of the following is not a property of physical adsorption ? JEE Main 2018 (Online) 16th April Morning Slot If x gram of gas is adsorbed by m gram of adsorbent at pressure P, the plot of log$${x \over m}versus log P is linea... JEE Main 2018 (Online) 15th April Evening Slot All of the following share the same crystal structure except : JEE Main 2018 (Online) 15th April Evening Slot Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substance ? JEE Main 2018 (Online) 15th April Morning Slot Which of the following statements about colloids is False ? JEE Main 2018 (Online) 15th April Morning Slot Which type of ‘defect’ has the presence of cations in the interstitial sites? JEE Main 2018 (Offline) Adsorption of a gas on a surface follows Freundlich adsorption isotherm. Plot of log{x \over m} versus log p gives ...
JEE Main 2017 (Online) 9th April Morning Slot
Among the following, correct statement is :
JEE Main 2017 (Online) 8th April Morning Slot
The Tyndall effect is observed only when following conditions are satisfied: (a) The diameter of the dispersed particles...
JEE Main 2017 (Offline)
A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is ‘a’, the closest approach...
JEE Main 2017 (Offline)
Gold numbers of some colloids are : Gelatin : 0.005 - 0.01, Gum Arabic : 0.15 - 0.25; Oleate : 0.04 - 1.0; Starch : 15 -...
JEE Main 2016 (Online) 10th April Morning Slot
A particular adsorption process has the following characteristics : (i) It arises due to van der Waals forces and (ii) i...
JEE Main 2016 (Online) 9th April Morning Slot
For a linear plot of log (x/m) versus log p in a Freundlich adsorption isotherm, which of the following statements is co...
JEE Main 2016 (Offline)
3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06N) in a flask. After an hour it was filtered a...
JEE Main 2015 (Offline)
Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29 Å . The radius of sodium atom is...
JEE Main 2015 (Offline)
CsCl crystallises in body centred cubic lattice. If ‘a’ is its edge length then which of the following expressions is co...
JEE Main 2014 (Offline)
The coagulating power of electrolytes having ions Na+, Al3+ and Ba2+ for arsenic sulphide sol increases in the order: ...
JEE Main 2013 (Offline)
Which of the following exists as covalent crystals in the solid state?
JEE Main 2013 (Offline)
Experimentally it was found that a metal oxide has formula M0.98O. Metal M, present as M2+ and M3+ in its oxide. Fractio...
JEE Main 2013 (Offline)
According to Freundlich adsorption isotherm, which of the following is correct ?
AIEEE 2012
Lithium forms body centred cubic structure. The length of the side of its unit cell is 351 pm. Atomic radius of the lith...
AIEEE 2012
In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If ...
AIEEE 2011
Percentages of free space in cubic close packed structure and in body centred packed structure are respectively
AIEEE 2010
The edge length of a face centered cubic cell of an ionic substance is 508 pm. If the radius of the cation is 110 pm, th...
AIEEE 2010
Copper crystallizes in fcc with a unit cell length of 361 pm. What is the radius of copper atom ?
AIEEE 2009
Which of the following statements is incorrect regarding physisorptions ?
AIEEE 2009
In a compound atoms of element Y from ccp lattice and those of element X occupy 2/3rd of tetrahedral voids. The formula ...
AIEEE 2008
Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005, respectively. The correct order of the...
AIEEE 2008
Total volume of atoms present in a face-centre cubic unit cell of a metal is (r is atomic radius)
AIEEE 2006
In Langmuir’s model of adsorption of a gas on a solid surface
AIEEE 2006
An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces o...
AIEEE 2005
The volume of a colloidal particle, VC as compared to the volume of a solute particle in a true solution VS, could be ...
AIEEE 2005
The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respective...
AIEEE 2005
What type of crystal defect is indicated in the diagram below? ...
AIEEE 2004
How many unit cells are present in a cubeshaped ideal crystal of NaCl of mass 1.00 g? [Atomic masses: Na = 23, Cl = 35.5...
AIEEE 2003
Which one of the following characteristics is not correct for physical adsorption?
AIEEE 2003
The formation of gas at the surface of tungsten due to adsorption is the reaction of order
AIEEE 2002
Na and Mg crystallize in BCC and FCC type crystals respectively, then the number of atoms of Na and Mg present in the un...
AIEEE 2002

### Joint Entrance Examination

JEE Main JEE Advanced WB JEE

### Graduate Aptitude Test in Engineering

GATE CSE GATE ECE GATE EE GATE ME GATE CE GATE PI GATE IN

NEET

Class 12