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- Question
Boron cannot form which one of the following anions? (1) BO2- (2) BF63- (3) BH4- (4) B(OH)4-
Options- A. Option 1
- B. Option 2
- C. Option 3
- D. Option 4
- Correct Answer
- Option 2
ExplanationDue to absence of low lying vacant d orbital in B, hybridization is not possible hence will not formed.
- 1. Electromagnetic radiation with maximum wavelength is
Options- A. ultraviolet
- B. radio waves
- C. x-rays
- D. infrared Discuss
- 2. The nitrogen atom has 7 protons and 7 electrons,The nitride ion will have
Options- A. 10 protons and 7 electrons
- B. 7 protons and 10 electrons
- C. 4 protons and 7 electrons
- D. 4 protons and 10 electrons Discuss
- 3. In known elements, the maximum number is of
Options- A. Metals
- B. Non Metals
- C. Metalloids
- D. None of these Discuss
- 4. What is the element present in urea
Options- A. C,H,O
- B. C,N,O
- C. C,N,H
- D. C,O,N,H Discuss
- 5. The metal which reacts most violently with with cold water is
Options- A. calcium
- B. sodium
- C. magnesium
- D. potassium Discuss
- 6. The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 at 27°C is to a volume of 100 dm3
Options- A. 42.3 J/ mole / K
- B. 38.3 J/ mole / K
- C. 35.8 J/ mole / K
- D. 32.3 J/ mole / K Discuss
- 7. The bleeding of a wound is stopped by the application of ferric chloride because_____
Options- A. Ferric chloride seals the blood vessels
- B. Blood starts flowing in the opposite direction
- C. Blood reacts and a solid is formed which seals the blood vessels
- D. Blood is coagulated and the blood vessels are sealed Discuss
- 8. Which gas is known as "Fuel of Future" ?
Options- A. Methane
- B. Oxygen
- C. Neon
- D. Hydrogen Discuss
- 9. Which of the Following is an Amorphous solid?
Options- A. Quartz Glass(Sio2)
- B. Chrome Alum
- C. Silicon Carbide(SiC)
- D. Graphite Discuss
- 10. Natural Rubber is a Polymer of
Options- A. butadiene
- B. 2methyl-1,3butadiene
- C. ethylene
- D. isoprene Discuss
Chemistry problems
Search Results
Correct Answer: radio waves
Correct Answer: 7 protons and 10 electrons
Correct Answer: Metals
Correct Answer: C,O,N,H
Correct Answer: potassium
Explanation:
Potassium reacts violently with water liberating hydrogen. The reaction is so violent that the liberated hydrogen catches fire.
Correct Answer: 38.3 J/ mole / K
Explanation:
= =
Correct Answer: Blood is coagulated and the blood vessels are sealed
Correct Answer: Hydrogen
Explanation:
Because of its being pollution free and combustion efficient, Hydrogen gas is called fuel of future. Because of its origin in marshy places, Methane is called as 'Marsh Gas'.
Correct Answer: Quartz Glass(Sio2)
Explanation:
An amorphous or non-crystalline solid is a solid that lacks the long-range order that is characteristic of a crystal. In Brief, An amorphous solid is any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel.
Quartz glass (SiO2) is an amorphous solid due to its short range order of constituent particles. Note Quartz is a crystalline solid while quartz glass is an amorphous solid.
Correct Answer: isoprene
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