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- Question
Which one is not the isotopes of hydrogen
Options- A. Protium
- B. Deuter
- C. Tritium
- D. All
- Correct Answer
- Tritium
- 1. In isotopes the number of neutrons are
Options- A. same
- B. different
- C. both
- D. none Discuss
- 2. Of the following radiations, the most easily stopped by air
Options- A. alpha - rays
- B. beta - rays
- C. gamma -rays
- D. x - rays Discuss
- 3. Gamma rays are
Options- A. high energy electrons
- B. low energy electrons
- C. high energy electromagnetic
- D. high energy positrons waves Discuss
- 4. Nucleons are
Options- A. protons and neutrons
- B. neutrons and electros
- C. protons and electrons
- D. protons, neutrons and electrons Discuss
- 5. Rutherford's alpha-scattering experiment related to the size of the
Options- A. nucleus
- B. atom
- C. electron
- D. neutron Discuss
- 6. The enzyme in whosepresence glucose and fructose are converted into alcohol is
Options- A. Diastase
- B. Maltase
- C. Invertase
- D. Zymase Discuss
- 7. The pH of pure water is nearly 7.It will increase on the addition of
Options- A. ammonia
- B. cane sugar
- C. common salt
- D. hydrochloric acid Discuss
- 8. Which of the following is an Organic Molecule?
Options- A. Nitrogen gas
- B. Ammonia
- C. Fructose
- D. Water Discuss
- 9. What does one mole of H2O correspond to
Options- A. 16 gms
- B. 18 gms
- C. 20 gms
- D. 22 gms Discuss
- 10. Which sample is a pure substance?
Options- A. Table salt
- B. Pure water
- C. a test tube of zinc oxide
- D. All the above Discuss
Chemistry problems
Search Results
Correct Answer: different
Correct Answer: alpha - rays
Correct Answer: high energy electromagnetic
Correct Answer: protons and neutrons
Correct Answer: nucleus
Correct Answer: Zymase
Correct Answer: ammonia
Explanation:
Ammonia is a base. One adding ammonia to water,the resulting solution will become basic. pH of an alkaline solution is 7. So the pH will increase
Correct Answer: Fructose
Explanation:
Fructose is an Organic molecule among the given options.
Organic Molecules :
An organic molecule is one which contains carbon, although not all compounds that contain carbon are organic molecules. Noticeable exceptions are carbon monoxide (CO), carbon dioxide (CO2), carbonates (e.g. calcium carbonate), carbides (e.g. calcium carbide) and cyanides (e.g. sodium cyanide). Pure carbon compounds such as diamond and graphite are also not organic compounds. Organic molecules can range in size from simple molecules to complex structures containing thousands of atoms.
Although carbon is present in all organic compounds, other elements such as hydrogen (H), oxygen(O), nitrogen (N), sulfur (S) and phosphorus (P) are also common in these molecules.
In simple, Molecules needed for life that have carbon are called Organic Molecules.
Correct Answer: 18 gms
Explanation:
The molar mass of H2O can be calculated as the following.
M(H2O)= [2 x M(H)] + [M(O)].
And we know that M(H) = 1g/mol, M(O) = 16g/mol.
So, M(H2O)= 2x1 + 16 = 18g/mol,
That means 1 mole of H2O contains 18g.
Hence, one mole of H2O corresponds to 18 grams.
Correct Answer: All the above
Explanation:
A pure substance can be defined as any single type of material that has not been contaminated by another substance. In chemistry, a pure substance has a definite composition. It can be a compound or an element. A pure substance is considered to be a material that consists of one type of "building block" of matter.
Examples of pure substances include tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate).
Tin, sulfur, and diamond are examples of pure substances which are chemical elements. All elements are pure substances.
Water, sugar, salt and baking soda are pure substances which are chemical compounds. Chemical compounds also are pure substances
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