Br– ion forms a closed packed structure. If the radius of it is 195 pm. Which of the following is true?
In fcc crystal lattice, edge length is 400 pm. Find the diameter of greatest sphere which can be fitted into the interstitial vo id without distortion of lattice:
For a Ag-Zn button cell, net reaction is, Zn(s) + Ag2O(s) → ZnO(s) + 2Ag(s) ΔGf(Ag2O) = -11.21 kJ mol-1, ΔGf(ZnO) = -318.3 kJ mol-1, 1 Faraday = 96500C Hence, E°cell of the button cell is:
Sn2+ + 2e– → Sn, E0 = – 0.14 V
Sn4+ + 2e- → Sn2+, E0 = + 0.13 V
Which of the following is true?
Each Rubidium halide crystallizing in the NaCl type lattice has a unit cell length 30 pm greater than for corresponding potassium salt (RK+ = 133 pm) of the same halogen. What is ionic radius of Rb+?
At what glancing angle would the first order diffraction occur, when copper radiation (wavelength = 154 pm) interacts with lattice planes that are 154 pm apart?
% of free space in ccp and bcc structure are, respectively:
In fcc lattice, atom A occupies the corner position and B occupies the face center positions. If one atom of B is missing from one of the Face centered positions, the formula of compound is?
The distance between two successive (110) planes in a simple cubic lattice with lattice parameter ‘a’ is:
CsBr crystal has a bcc structure. It has an edge length of 4.3 Å. The shortest interionic distance between cation and anion is
Cu metal crystallizes with fcc structure. The density of crystal is 2698 kg/m3 and mass is 26.98 Kg. X-ray of wavelength 1.537 nm are diffracted by the crystal and the Bragg’s angle is 19.20. Identify the crystal plane which caused this diffraction. (NA = 6.023 × 1023)
If unit cell of a material has ccp array of Oxygen atoms with ‘m’ fraction of Octahedral holes occupied by Aluminium ions and ‘n’ fraction of Tetrahedral holes occupied by Magnesium ions. Then ‘m’ and ‘n’ are respectively:
Silver has a density of 10.5 g/cm3. The number of Silver atoms on a surface of area 10–12 m2 can be expressed in scientific notation as y × 10x. The value of ‘x’ is? (Given. At.Wt of silver = 108g/mol)
Match axial parameters given in List-I with crystal systems given in List-II and select the correct answer using the codes given below the lists:
Consider the following equations for a cell reaction:
A+B → C+D E0 = x; Keq = k1
2A+2B → 2C +2D E0 = y; Keq = k2
Match the following:
For the reactions,
Then, for the reaction,
A compound MpXq has cubic close packing (ccp) arrangement of X. Its unit cell structure is shown below. The empirical formula of the compound is:
CH3COOH is titrated with NaOH solution. Which is true statement:
The conductivity of the saturated solution of some bivalent salt XY is 3.06 × 10–6 ohm–1 cm–1 and its equivalent conductivity is 1.53 ohm–1 cm2 equiv–1. The value of Ksp of XY is:
In the following electrochemical cell: Zn|Zn+2||H+|H2(Pt) and E0cell = Ecell
This is possible when:
The X at 1 atm is bubbled through a solution containing a mixture of 1 MY– and 1 MZ– at 25°C. If the order of reduction potential is Z < Y > X, then:
The ionization constant of a weak electrolyte is 25 × 10–6 while the equivalent conductance of its 0.01 M solution is 19.6 s cm2 eq–1. The equivalent conductance of the electrolyte at infinite dilution (in 5 cm2 eq–1) will be:
The standard reduction potential at 298 K for the following half cells are given:
Which is the strongest reducing agent:
Which of the following solutions of KCl has the lowest value of specific conductance?
Consider the given data:
E° for the reaction,
For the electrochemical cell,
= V and M° X / X- = 0.33 V.
= From this data we can deduce that:
The specific conductivity of solution depends upon:
In a solution, cations H+, Li+, Na+ and K+ are present. The one with highest ionic mobility and another with lowest ionic mobility respectively are:
An aqueous solution containing 0.01 M FeCl3 and 0.06 M HClO4 has the same ionic strength as a solution of:
Which of the following statements are correct:
For the cell prepared from electrode A and B; Electrode A: Cr2O72–| Cr3+, E°red = + 1.33 V and electrode B; Fe3+|Fe2+, E°red = 0.77 V.
Which of the following statements are correct:
Select the correct statements about solid crystals:
p-type semiconductors are produced when:
If the radius of Na+ ion is 95 pm and that of Cl– ion is 181 pm. Then:
Which is the incorrect statement:
In which of the following structures, the coordination number of both the ions are same:
Which of the following are concentration cells?
Which is/are correct match about coductometric titration:
Which of the following statements is correct for ionic mobility?
A 0.05 N solution of a salt occupying a volume between two platinum electrodes separated by a distance of 1.72 cm and having an area of 4.5 cm2 has a resistance of 250 ohm. Calculate the equivalent conductance (in s–1 cm2 eq–1) of the solution [rounded up to two decimal places]:
An electric current of 100 ampere is passed through a molten liquid of sodium chloride for 5 hours. Calculate the volume (in L) of chlorine gas liberated at the electrode at NTP. (Consider volume at NTP = 22.4L, 1F = 96500C & calculate the answer up to two decimal places):
For the following reaction,
Calculate –log10 Ksp(AgCl) at 298 K [rounded up to two decimal places].
In silicates, the Oxygen atom form a tetrahedral void and the limiting ratio for tetrahedral void is 0.22. The radius of oxide is 1.4Å. Find out the radius of cation [rounded up to three decimal places]:
A compound form hexagonal close packed. What is the total number of voids (up to two decimal places & in the multiple of 1023) in 0.5 mol of it? [rounded up to three decimal places]
Li forms bcc structure. The length of side of its unit cell is 351 pm. Atomic radius (in pm & up to first decimal places) of Lithium will be?
X-ray of wavelength 0.154 nm striking an Aluminium crystal, get reflected at an angle of 25.50 showing first order diffraction. Calculate the spacing between plane of aluminium atoms (in pm, rounded up to first decimal places):
Given the E° values for the following react ion sequence,
The computed value of E° for (rounded up to two decimal place)
If 0.01 M solution of an electrolyte has a resistance of 40 ohm in a cell having a cell constant of 0.4 cm–1, then, its molar conductance in ohm–1 cm2 mol–1 will be:
Calculate the pH (rounded up to two decimal places) of the following half-cell solution at 298K.
Pt(H2, 1atm) | H+(HCl); E = 0.25 volt
Radius of Be+2 is 59 pm and that of S–2 is 170 pm. Find out the coordination number:
In a diffraction experiment with X-rays of wavelength 1.54 Å, a diffraction line corresponding to 2q = 20.8° is observed. The inter-planar separation in Å is _________: (rounded up to two decimal place)
To find the standard potential of M3+/M electrode, the following cell is constituted. Pt|M|M3+ (0.0018 mol–1L) || Ag+ (0.01 mol–1L)|Ag The emf of this cell is found to be 0.42 volt. Calculate the standard potential of the anode half (up to two decimal places). Given E0Ag+|Ag = 0.80 Volt.
A metal crystallizes in two cubic phases, fcc and bcc whose unit cell lengths are 3.5Å and 3.0Å resp. Calculate the ratio (up to two decimal places) of densities of fcc to bcc.
The specific conductivity of 0.02 M KCl solution at 25°C is 2.768 × 10–3 ohm–1 cm–1. The resistance of this solution at 25°C when measured with a particular cell was 250.2 ohms. The resistance of 0.01 M CuSO4 solution at 25°C measured with the same cell was 8331 ohms. Calculate the molar conductivity (in s–1 cm2 mol–1& rounded up to three decimal places) of the copper sulfate solution:
What is the value of pKb (CH3COO–) if λ°m 390 & λm = 7.8 for 0.04 M CH3COOH at 25°C?
(rounded up to two decimal place):
Calculate the percentage of unoccupied volume in case of metal crystal of primitive cubic: [rounded up to two decimal places]
The edge length of unit cell of a metal having molecular weight 75g/mol is 5Å which crystallizes in cubic lattice. If the density is 2g/cm3, then, find the radius (in pm, rounded up to first decimal places) of metal atom:
Consider the cell Cd|CdCl2.2H2O|AgCl(s)| Hg
The emf of the cell at 15°C is 0.67531 V and temperature coefficient of emf is 0.00065 V deg–1. Calculate the value of heat flow (in Joules/mol) if the process is carried reversibly: [rounded up to first decimal places]
The angle at which the first order Bragg reflection is observed from (110) plane in a simple cubic unit cell of side 3.238 Å when chromium Kα radiation of wavelength 2.29 Å is used, is (rounded up to first decimal place):