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28. Which one of the following charging process does not require the direct contact of the charged and neutral bodies? [ Entrance ] Anonymous voting
- A. rubbing
- B. conduction
- C. induction
- D. None
👍 9❤ 8🥰 1
26. The charge on one of two small charged spheres is doubled while the distance between them remains
the same, the electrostatic force between the point sources will be [Entrance exam ]Anonymous voting
- A. halved
- B. doubled
- C. Tripled
- D. Unchanged
👍 5❤ 1😱 1🎉 1
27. The electrical resistance of a metal wire could be decreased by
[ Matric exam ]Anonymous voting
- A. increasing its temperature
- B.increasing its length
- C. increasing its diameter
- D. By increasing resistivity
👍 6❤ 2
What is the solution set of |X-4| ≥-3?Anonymous voting
- A. {}
- B. R
- C. >7
- D. [4,5]
👍 7
What is the distance between the given points A(3, -6) and B(1/2, √3/3)?Anonymous voting
- √28 units
- 9.63 units
- 4.89 units
- 5.43 units
👍 8❤ 4🥰 1
Suppose f is a twice continuously differentiable function and f"(3) = 5. If g(2x+3), then the second derivative of g at 0 is equal to: (EUEE 2014)Anonymous voting
- 5
- 10
- 40
- 20
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If the volume of right circular cone is 64π cm³ and the diameter of its base is 8cm, what is the height of the cone? ( EUEE 2014 E.CAnonymous voting
- 8cm
- 3cm
- 4cm
- 12cm
👍 8😱 1
📘Chemistry common questions about Redox Reactions & Oxidation States:
1. Which of the following is a defining characteristic of ALL redox reactions?
a) Formation of a precipitate
b) Transfer of protons (H⁺ ions)
c) Transfer of electrons
d) Release of heat (exothermic reaction)
Answer: c) Transfer of electrons
2. In the following reaction, which species is being oxidized? 2 Ag⁺(aq) + Cu(s) → 2 Ag(s) + Cu²⁺(aq)
a) Ag⁺
b) Cu
c) Ag
d) Cu²⁺
Answer: b) Cu (Loses electrons, oxidation number increases)
3. What is the oxidation state of sulfur (S) in H₂SO₄?
a) +2
b) +4
c) +6
d) -2
Answer: c) +6
4. Which of the following is NOT a possible oxidation state of chlorine (Cl)?
a) -1
b) +1
c) +3
d) +6
Answer: d) +6 (Chlorine can have oxidation states from -1 to +7, but not +6)
5. In a balanced half-reaction, what is used to balance the charges?
a) H₂O
b) H⁺ ions
c) Electrons (e⁻)
d) All of the above
Answer: c) Electrons (e⁻)
6. A reducing agent is a species that:
a) Loses electrons and is reduced.
b) Gains electrons and is reduced.
c) Loses electrons and is oxidized.
d) Gains electrons and is oxidized.
Answer: c) Loses electrons and is oxidized.
7. In the compound Na₂O₂, what is the oxidation state of oxygen (O)?
a) -2
b) -1
c) 0
d) +1
Answer: b) -1 (This is a peroxide)
8. Disproportionation is a type of redox reaction in which:
a) The same element is both oxidized and reduced.
b) Two different elements are oxidized.
c) No electrons are transferred.
d) The reaction is always endothermic.
Answer: a) The same element is both oxidized and reduced.
9. What is the oxidation state of manganese (Mn) in the permanganate ion (MnO₄⁻)?
a) +2
b) +4
c) +7
d) -1
Answer: c) +7
10. Which of the following statements is TRUE about oxidation states?
a) They always represent the actual charges on atoms in a compound.
b) They are used to keep track of electron transfer in chemical reactions.
c) They are always positive whole numbers.
d) They are not applicable to covalent compounds.
Answer: b) They are used to keep track of electron transfer in chemical reactions.
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Joriy rejangiz faqat 5 ta kanal uchun analitika imkoniyatini beradi. Ko'proq olish uchun, iltimos, boshqa reja tanlang.