Chemistry problems
- 1. 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 Also asked in: AIEEE
Correct Answer: Option 2
Explanation:
Due to absence of low lying vacant d orbital in B, hybridization is not possible hence will not formed.
- 2. 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 Also asked in: AIEEE
Correct Answer: 38.3 J/ mole / K
Explanation:
= =
- 3. 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
Correct Answer: Blood is coagulated and the blood vessels are sealed
- 4. Which gas is known as "Fuel of Future" ?
Options- A. Methane
- B. Oxygen
- C. Neon
- D. Hydrogen Also asked in: AIEEE, Bank Exams, CAT, Bank Clerk, Bank PO
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'.
- 5. Which of the Following is an Amorphous solid?
Options- A. Quartz Glass(Sio2)
- B. Chrome Alum
- C. Silicon Carbide(SiC)
- D. Graphite Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
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.
- 6. Natural Rubber is a Polymer of
Options- A. butadiene
- B. 2methyl-1,3butadiene
- C. ethylene
- D. isoprene Also asked in: GATE, CAT, Bank Exams, AIEEE, Database Administrator, Bank PO, Bank Clerk, Analyst
Correct Answer: isoprene
- 7. ATP stands for -
Options- A. Adenosine triphosphate
- B. Alanine triphosphate
- C. Adrenalin triphosphate
- D. Asparagine triphosphate Also asked in: AIEEE, Bank Exams
Correct Answer: Adenosine triphosphate
Explanation:
Adenosine triphosphate (ATP) is a nucleotide which is also called as nucleoside triphosphate is a small molecule used in cells as a coenzyme. It is often referred to as the "molecular unit of currency" of intracellular energy transfer. ATP transports chemical energy within cells for metabolism. Most of the cellular functions need energy in order to be carried out such as synthesis of proteins, synthesis of membranes, movement of the cell, cellular division, transport of various solutes etc. The ATP is the molecule that carries energy to the place where the energy is needed. When ATP breaks into ADP (adenosine diphosphate) and Pi (phosphate), the breakdown of the last covalent link of phosphate liberates energy that is used in reactions where it is needed.
- 8. Ethanol is converted into ethoxy ethane,
Options- A. by heating excess of ethanol with conc. H2SO4 at 140°C
- B. by treating with conc. H2SO4 at room temperature
- C. by treating with conc. H2SO4 at 273 K
- D. by heating Ethanol with excess of conc. H2SO4 at 443 K Also asked in: AIEEE
Correct Answer: by heating excess of ethanol with conc. H2SO4 at 140°C
- 9. Temporary hardness is due to the presence of
Options- A. Calcium carbonate
- B. calcium bicarbonate
- C. magnesium sulphate
- D. calcium sulphate Discuss
Correct Answer: calcium bicarbonate
Explanation:
Temporary hardness is due to the presence of soluble bicarbonates of calcium and magnesium in water. Permanent hardness is due to the presence of sulphates and chlorides of calcium and magnesium.
- 10. The hard Shell of an egg was dissolved in HCL. The egg was then placed in a concentration solution of NaCl. What will happens ______
Options- A. The egg will shrink
- B. The egg will swell
- C. The egg will become harder
- D. There will be hardly any visible change Discuss
Correct Answer: The egg will shrink
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