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- Question
Chemical composition of cement is
Options- A. Limestone and Clay
- B. Limestone, Clay and Gypsum
- C. Limestone and Gypsum
- D. Clay and Gypsum
- Correct Answer
- Limestone, Clay and Gypsum
- 1. The most abundant element in the earth's atmosphere is
Options- A. Argon
- B. Nitrogen
- C. Oxygen
- D. Krypton Discuss
- 2. Consider the following constituent gases of the atmosphere : 1. Argon 2. Neon 3. Helium 4.Ceirbon dioxide Which one of the following is the correct ascending sequence of the above gases in terms of the volume percentage?
Options- A. 1-3-2-4
- B. 1-4-2-3
- C. 4-2-3-1
- D. 2-4-1-3 Discuss
- 3. Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?
Options- A. Element with 18 neutrons and 20 protons
- B. Element with 19 neutrons and 18 protons
- C. Element with 19 neutrons and 20 protons
- D. Element with 18 neutrons and 22 neutrons Discuss
- 4. Which of the following bonds are weakest in nature?
Options- A. Single bond
- B. Double bond
- C. Triple bond
- D. Hydrogen bond Discuss
- 5. Which of the following substances cause temporary hardness in water? 1. Mg(HCO3)2 2. Ca(HCO3)2 3. CaCl2 4. MgSO4
Options- A. 3 and 4
- B. 2and 3
- C. 1 and 4
- D. 1 and 2 Discuss
- 6. A radio-active substance has a half life of six months. Three-fourth of the substance will decay in ______.
Options- A. Six months
- B. Ten months
- C. Twelve Months
- D. Twenty four months Discuss
- 7. Ozone is an ______ of oxygen.
Options- A. Allotrope
- B. Isotope
- C. Isobar
- D. Isotone Discuss
- 8. Process of loosing electrons is known as _____.
Options- A. oxidation
- B. reduction
- C. radiation
- D. both oxidation and reduction Discuss
- 9. Anions are formed by _____.
Options- A. losing of electrons
- B. gaining of electrons
- C. gaining of neutrons
- D. losing of neutrons Discuss
- 10. What is the chemical formula for Sodium Chloride (Salt)?
Options- A. NaCl2
- B. NaCl
- C. Na2Cl
- D. Na2C Discuss
Chemistry problems
Search Results
Correct Answer: Nitrogen
Correct Answer: 1-4-2-3
Explanation:
Composition of Dry Air (Substance, % by volume)
Nitrogen, N2 78.08
Oxygen, O2
20.95
Argon, Ar 0.93
Carbon dioxide, CO2 0.033
Neon, Ne 0.0018
Helium, He 0.00052
Methane, CH4 0.0002
Krypton, Kr 0.00011
Dinitrogen oxide, N2O 0.00005
Hydrogen, H2 0.00005
Ozone, O3 0.000001
Correct Answer: Element with 18 neutrons and 22 neutrons
Explanation:
Isobar: one of two or more atoms having equal atomic weights but different atomic numbers.
Mass number Electrons Neutrons
Calcium 40 20 20
Argon 40 18 22
Correct Answer: Hydrogen bond
Correct Answer: 1 and 2
Explanation:
There are two types of water hardness: temporary and permanent hardness. Temporary hardness is due to the presence of calcium hydrogen carbonate Ca(HCO3)2(aq) and magnesium hydrogen carbonate Mg(HCO3)2(aq).
Correct Answer: Twelve Months
Correct Answer: Allotrope
Correct Answer: oxidation
Correct Answer: gaining of electrons
Correct Answer: NaCl
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