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- Question
Which of the following is most important for absorption of heat radiated from the Sun as well as from the Earth?
Options- A. Carbon dioxide
- B. Oxygen
- C. Carbon monoxide
- D. Nitrogen
- Correct Answer
- Carbon dioxide
- 1. Which one of the following statements is not correct?
Options- A. Fischer projection represents the molecule in an eclipsed conformation
- B. Newman projection can be represented in eclipsed, staggered and skew conformations
- C. Fischer projection of the molecule is its most stable conformation
- D. In Sawhorse projections, the lines are inclined at an angle of 120 deg to each other. Discuss
- 2. In which of the following, functional group isomerism is not possible?
Options- A. Alcohols
- B. Aldehydes
- C. Alkyl halides
- D. Cyanides Discuss
- 3. Which one of the following elements cannot be detected by "Lassaigne's test"?
Options- A. I
- B. Cl
- C. S
- D. F Discuss
- 4. Match List -I with List -II and select the correct answer using the code given below the Lists : List -I List-II (Compound/Molecule) (Shape of Molecule) A. CH3F 1. Trigonal planar B. HCHO 2. Tetrahedral C. HCN 3. Trigonal pyramidal D. NH3 4. Linear
Options- A. 2 4 1 3
- B. 2 1 4 3
- C. 3 4 1 2
- D. 3 1 4 2 Discuss
- 5. Which one of the following statements is correct?
Options- A. The oxidation number for hydrogen is always zero.
- B. The oxidation number for hydrogen is always + 1.
- C. The oxidation number for hydrogen is always -1.
- D. Hydrogen can have more than one oxidation number. Discuss
- 6. What are isobars?
Options- A. Elements with same atomic number but different mass number
- B. Elements with different atomic number but same mass number
- C. Elements with different atomic number and different mass number
- D. Elements with same atomic number and same mass number Discuss
- 7. Which of the following pairs is INCORRECT? I. Haematite : Iron II. Pitchblende : Copper III. Monazite : Thorium
Options- A. Only I
- B. Only II
- C. Only I and Only II
- D. Only I and Only III Discuss
- 8. The monomer/monomers used for the synthesis of Nylon 6 is/are
Options- A. hexamethylenediamine and adipic acid
- B. caprolactam
- C. urea and formaldehydeD.
- D. phenol and formaldehyde Discuss
- 9. Which one of the following cell organelles mainly functions as storehouse of digestive enzymes?
Options- A. Desmosome
- B. Ribosome
- C. Lysosome
- D. Vacuoles Discuss
- 10. The PCl5 molecule has trigonal bipyramidal structure. Therefore,the hybridization of p orbitals should be
Options- A. sp2
- B. sp3
- C. dsp2
- D. dsp3 Discuss
Chemistry problems
Search Results
Correct Answer: Fischer projection of the molecule is its most stable conformation
Explanation:
Fischer projections were originally proposed for the depiction of carbohydrates and used by chemists, particularly in organic chemistry and biochemistry.A Fischer projection always uses an eclipsed conformation. A Newman diagram can represent either an eclipsed conformation or a staggered conformation or a skew conformation.
Correct Answer: Alkyl halides
Explanation:
The haloalkanes (also known as halogenoalkanes or alkyl halides) are a group of chemical compounds derived from alkanes containing one or more halogens.Halogens can?t form more than one bond in the context of common organic compounds and can?t form multiple bonds to carbon.
Correct Answer: F
Explanation:
The sodium fusion test, or Lassaigne's test, is used in elemental analysis for the qualitative determination of the presence of foreign elements, namely halogens, nitrogen, and sulphur, in an organic compound. It was developed by J. L. Lassaigne.Silver fluoride is soluble in water and does not precipitate and thus this method cannot be used for detection of fluorine.
Correct Answer: 2 1 4 3
Explanation:
HCHO: The carbon and and the oxygen are bonded through a double bond which counts as "one electron pair". Hence the molecule has three electron pairs and is trigonal planar.
Correct Answer: Hydrogen can have more than one oxidation number.
Explanation:
Hydrogen has two possible oxidation numbers: +1 and -1.
-1 in case of hydrides.
Correct Answer: Elements with different atomic number but same mass number
Correct Answer: Only II
Correct Answer: hexamethylenediamine and adipic acid
Explanation:
Nylon is made when the appropriate monomers (the chemical building blocks which make up polymers) are combined to form a long chain via a condensation polymerisation reaction. The monomers for nylon 6-6 are adipic acid and hexamethylene diamine
Correct Answer: Lysosome
Explanation:
Lysosome is found in nearly all types of eukaryotic cells (cells with a clearly defined nucleus) and is responsible for the digestion of macromolecules, old cell parts, and microorganisms. Each lysosome is surrounded by a membrane that maintains an acidic environment within the interior via a proton pump. Lysosomes contain a wide variety of hydrolytic enzymes (acid hydrolases) that break down macromolecules such as nucleic acids, proteins, and polysaccharides. So, they are known as storehouse of digestive enzymes.
Correct Answer: dsp3
Explanation:
The P atom needs five orbitals to form the five P-Cl bonds. It has a 3s and three 3p orbitals, so it must use one of its 3d orbitals to form the fifth bond. These orbitals are hybridized to form five sp3d orbitals that just happen to point in the right directions to form a trigonal bipyramid.
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