Surface Chemistry & Solid State · JEE Main previous year questions

100 questions asked across 19 exam years, newest first

Year-wise papers Topic-wise questions

Practise this topic

2020 10 questions

Q672020 · 6 Sept 2020 · Shift 2
A crystal is made up of metal ions ' $M_{1}$ ' and ' $M_{2}$ ' and oxide ions. Oxide ions form a ccp lattice structure. The cation ' $M_{1}$ ' occupies 50% of octahedral voids and the cation ' $M_{2}$ ' occupies 12.5% of tetrahedral voids of oxide lattice. The oxidation numbers of ' $M_{1}$ ' and ' $M_{2}$ ' are, respectively :
1. A. $+ 3, + 1$
2. B. $+ 4, + 2$
3. C. $+ 1, + 3$
4. D. $+ 2, + 4$
Show answer
Answer: D
Q752020 · 6 Sept 2020 · Shift 2· Numerical answer
For Freundlich adsorption isotherm, a plot of $lo g (x / m)$ (y-axis) and $lo g p$ (x-axis) gives a straight line. The intercept and slope for the line is 0.4771 and 2, respectively. The mass of gas, adsorbed per gram of adsorbent if the initial pressure is 0.04 atm, is ______ $\times 1 0^{- 4} g$ . ( $lo g 3 = 0.4771$ )
Show answer
Answer: 48
Q692020 · 3 Sept 2020 · Shift 1
Tyndall effect is observed when:
1. A.The diameter of dispersed particles is similar to the wavelength of light used.
2. B.The diameter of dispersed particles is much smaller than the wavelength of light used.
3. C.The diameter of dispersed particles is much larger than the wavelength of light used.
4. D.The refractive index of dispersed phase is greater than that of the dispersion medium.
Show answer
Answer: A
Q752020 · 3 Sept 2020 · Shift 1· Numerical answer
An element with molar mass $2.7 \times 1 0^{- 2} kg mo l^{- 1}$ forms a cubic unit cell with edge length 405 pm. If its density is $2.7 \times 1 0^{3} kg m^{- 3}$ , the radius of the element is approximately _______ $\times 1 0^{- 12} m$ (to the nearest integer).
Show answer
Answer: 143
Q692020 · 3 Sept 2020 · Shift 2
1. A.
2. B.
3. C.
4. D.
Show answer
Answer: A
Q662020 · 2 Sept 2020 · Shift 1
On heating compound (A) gives a gas (B) which is a constituent of air. This gas when treated with $H_{2}$ in the presence of a catalyst gives another gas (C) which is basic in nature. (A) should not be :
1. A. $Pb (N O_{3})_{2}$
2. B. $(N H_{4})_{2} C r_{2} O_{7}$
3. C. $N H_{4} N O_{2}$
4. D. $Na N_{3}$
Show answer
Answer: A
Q692020 · 2 Sept 2020 · Shift 1
Which of the following is used for the preparation of colloids?
1. A.Van Arkel Method
2. B.Bredig’s Arc Method
3. C.Mond Process
4. D.Ostwald Process
Show answer
Answer: B
Q692020 · 8 Jan 2020 · Shift 1
As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order :
1. A. $AlC l_{3} > K_{3} [Fe (CN)_{6}] > K_{2} Cr O_{4} > KBr = KN O_{3}$
2. B. $K_{3} [Fe (CN)_{6}] < K_{2} Cr O_{4} < KBr = KN O_{3} = AlC l_{3}$
3. C. $K_{3} [Fe (CN)_{6}] < K_{2} Cr O_{4} < AlC l_{3} < KBr < KN O_{3}$
4. D. $K_{3} [Fe (CN)_{6}] > AlC l_{3} > K_{2} Cr O_{4} > KBr > KN O_{3}$
Show answer
Answer: B
Q672020 · 8 Jan 2020 · Shift 2
Which of the following compounds is likely to show both Frenkel and Schottky defects in its crystalline form?
1. A.CsCl
2. B.AgBr
3. C.ZnS
4. D.KBr
Show answer
Answer: B
Q702020 · 7 Jan 2020 · Shift 1
In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is :
1. A.less efficient as the resins cannot be regenerated.
2. B.more efficient as it can exchange only cations.
3. C.more efficient as it can exchange both cations as well as anions.
4. D.less efficient as it exchanges only anions.
Show answer
Answer: C