Subtopic: Aldehydes & Ketones: Preparation & Properties |
76%
Level 2: 60%+
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Which of the following is present in a fire extinguisher?
1. Baking Soda
2. Washing soda
3. Caustic Soda
4. Soda ash
1. Baking Soda
2. Washing soda
3. Caustic Soda
4. Soda ash
Subtopic: Compounds of Ca and Na -Preparations, Properties & Uses |
68%
Level 2: 60%+
JEE
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The correct increasing order of stability of \(\mathrm{C}_{2}^{2-}, \mathrm{O}_{2}^{2-}, \mathrm{N}_{2}^{2-}\) is:
1. \(\mathrm{C}_{2}^{2-}, \mathrm{O}_{2}^{2-}, \mathrm{N}_{2}^{2-}\)
2. \(\mathrm{O}_{2}^{2-}, \mathrm{C}_{2}^{2-}, \mathrm{N}_{2}^{2-} \)
3. \(\mathrm{N}_{2}^{2-}, \mathrm{C}_{2}^{2-}, \mathrm{O}_{2}^{2-} \)
4. \(\mathrm{O}_{2}^{2-}, \mathrm{N}_{2}^{2-}, \mathrm{C}_{2}^{2-}\)
1. \(\mathrm{C}_{2}^{2-}, \mathrm{O}_{2}^{2-}, \mathrm{N}_{2}^{2-}\)
2. \(\mathrm{O}_{2}^{2-}, \mathrm{C}_{2}^{2-}, \mathrm{N}_{2}^{2-} \)
3. \(\mathrm{N}_{2}^{2-}, \mathrm{C}_{2}^{2-}, \mathrm{O}_{2}^{2-} \)
4. \(\mathrm{O}_{2}^{2-}, \mathrm{N}_{2}^{2-}, \mathrm{C}_{2}^{2-}\)
Subtopic: M.O.T |
78%
Level 2: 60%+
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The total energy of 1 mol of photons in J/mol having \(\lambda = 600 \ nm \) is:
Given: \(h = 6.62 \times 10^{-34} \mathrm{~J} \ \mathrm{sec}, \mathrm{c}=3 \times 10^{8} \mathrm{~m \ s}^{-1}\)
1. \(2 \times 10^5 J/mol\)
2. \(6.64 \times 10^8 J/mol\)
3. \(1.24 \times 10^4 J/mol\)
4. \(1.24 \times 10^8 J/mol\)
Given: \(h = 6.62 \times 10^{-34} \mathrm{~J} \ \mathrm{sec}, \mathrm{c}=3 \times 10^{8} \mathrm{~m \ s}^{-1}\)
1. \(2 \times 10^5 J/mol\)
2. \(6.64 \times 10^8 J/mol\)
3. \(1.24 \times 10^4 J/mol\)
4. \(1.24 \times 10^8 J/mol\)
Subtopic: Electromagnetic Radiation |
69%
Level 2: 60%+
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PCl5 is formed whereas NCl5 is not formed because:
| 1. | Phosphorous has vacant d-orbitals while nitrogen does not have vacant d-orbitals. |
| 2. | PCl5 is stable while NCl5 is unstable. |
| 3. | Phosphorous is more reactive while nitrogen is inert. |
| 4. | Phosphorous has a large size while nitrogen has a small size. |
Subtopic: Group 15 - Preparation, Properties & Uses |
92%
Level 1: 80%+
JEE
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In an acidic solution, Mn(VI) becomes unstable and converts into its two product ions. If the difference in the oxidation state of its product ions is 'x', then the value of 'x' is:
1. Three (3)
2. Five (5)
3. Six (6)
4. Zero (0)
1. Three (3)
2. Five (5)
3. Six (6)
4. Zero (0)
Subtopic: d-Block Elements- Properties & Uses |
55%
Level 3: 35%-60%
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If the work function of a metal is 6.63 × 10–19J, the maximum wavelength of the photon required to remove a photoelectron from the metal is :
(Given h = 6.63 × 10–34 J sec)
1. 280 nm
2. 310 nm
3. 300 nm
4. 290 nm
(Given h = 6.63 × 10–34 J sec)
1. 280 nm
2. 310 nm
3. 300 nm
4. 290 nm
Subtopic: Planck's Theory |
82%
Level 1: 80%+
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The correct electronic configuration of an element that is just above the 4th period and belongs to the 16th group is:
1. 4s23d104p4
2. 2s22p4
3. 3s23p4
4. 5s25d104p4
1. 4s23d104p4
2. 2s22p4
3. 3s23p4
4. 5s25d104p4
Subtopic: Electronic Configuration |
62%
Level 2: 60%+
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How many charges in Faraday is required in the conversion of 1 mole \(Cr_2O_7^{2-}\) into \(Cr^{3+} \)?
1. 3
2. 6
3. 4
4. 2
1. 3
2. 6
3. 4
4. 2
Subtopic: Faraday’s Law of Electrolysis |
64%
Level 2: 60%+
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Calculate the internal energy of 2 moles of an ideal monoatomic gas at 300 K.
(Given R=8.31 J/mol K)
1. 7421 J
2. 7479 J
3. 7589 J
4. 7531 J
(Given R=8.31 J/mol K)
1. 7421 J
2. 7479 J
3. 7589 J
4. 7531 J
Subtopic: Enthalpy & Internal energy |
87%
Level 1: 80%+
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