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- Question
Is steel a compound?
Options- A. TRUE
- B. FALSE
- Correct Answer
- FALSE
ExplanationSteel is not a compound or element. Steel is an alloy of iron and carbon and other elements and hence it is a mixture. Because of its high tensile strength and low cost, it is a major component used in buildings, infrastructure, tools, ships, automobiles, machines, appliances, and weapons.
- 1. Which choice best describes the polarity of BrF5?
Options- A. nonpolar bonds / nonpolar molecule
- B. nonpolar bonds / polar molecule
- C. polar bonds / polar molecule
- D. polar bonds / nonpolar molecule Discuss
- 2. Which of the following elements has the highest electronegativity?
Options- A. Chlorine
- B. Bromine
- C. Fluorine
- D. Helium Discuss
- 3. What are the end products of cellular respiration?
Options- A. ATP, Glucose
- B. Glucose, Oxygen
- C. Oxygen, Water
- D. ATP, Water Discuss
- 4. What is the gram formula mass of K2CO3 ?
Options- A. 147
- B. 138
- C. 129
- D. 116 Discuss
- 5. IUPAC full form
Options- A. Indian Union of Pure and Applied Chemistry
- B. International Union of Postal and Application Corporation
- C. International Union of Pure and Applied Chemistry
- D. International University of Poland And Combodia Discuss
- 6. Which compound forms a colored aqueous solution?
Options- A. CrCl3
- B. KBr
- C. CaCl2
- D. NaOH Discuss
- 7. Dry ice is nothing but
Options- A. Solid carbon dioxide
- B. Baking soda
- C. Gaseous carbon dioxide
- D. Carbon monoxide Discuss
- 8. What element behaves most like magnesium?
Options- A. Silicon
- B. Strontium
- C. Sulphur
- D. Tin Discuss
- 9. Isotopes are atoms of the same element that have different
Options- A. numbers of neutrons
- B. numbers of electrons
- C. numbers of protons
- D. atomic numbers Discuss
- 10. Ketchup stored in a tin can may lead to chemical contamination.
Options- A. TRUE
- B. FALSE Discuss
Chemistry problems
Search Results
Correct Answer: polar bonds / polar molecule
Correct Answer: Fluorine
Explanation:
Electronegativity refers to the ability of an atom to attract shared electrons in a covalent bond. The higher the value of the electronegativity, the more strongly that element attracts the shared electrons.
Electronegativity increases from bottom to top in groups, and increases from left to right across periods. Thus, fluorine is the most electronegative element and lithium is the least.
Correct Answer: ATP, Water
Explanation:
Cellular respiration is the three-step process by which cells make ATP using glucose and oxygen.
Oxygen and glucose are both reactants in the process of cellular respiration. The main product of cellular respiration is ATP, waste products include carbon dioxide and water.
Correct Answer: 138
Explanation:
The gram formula mass of a compound is nothing but the molar mass.
The molar mass of K2CO3 (Potassium Carbonate) is given by
Atomic weights of individual elements are
K (Potassium) = 39 g
C (Carbon) = 12 g
O (Oxygen) = 16 g
Hence, that of K2CO3 = 39(2) + 12 + 16(3)
= 78 + 12 + 48
= 138.
Correct Answer: International Union of Pure and Applied Chemistry
Explanation:
IUPAC stands for International Union of Pure and Applied Chemistry.
A chemical nomenclature is a set of rules to generate systematic names for chemical compounds. The nomenclature used most frequently worldwide is the one created and developed by the International Union of Pure and Applied Chemistry (IUPAC).
Correct Answer: CrCl3
Explanation:
Colored aqueous solutions are a characteristic of transition compounds.
The only transition compound in the above choices is CrCl3.
Cr is a transition element.
Correct Answer: Solid carbon dioxide
Correct Answer: Strontium
Explanation:
We know that, Elements in the same group of the periodic table have similar characteristics.
Here Magnesium and Strontium shared some similar properties because they both belong to the same group. Sr is the chemical symbol for strontium which is a group two element; it has atomic number of 38.
Correct Answer: numbers of neutrons
Explanation:
Isotopes are variations of an element that have the same charge as the original element, but a different mass, which is caused by either more/less neutrons in the nucleus.
Correct Answer: TRUE
Explanation:
The given statement is True.
Ketchup is acidic, having a pH of 3.9. The acidic component, acetic acid, will react with the metal tin. This reaction will result in a metal acetate that will contaminate the ketchup.
Hence, The acetic acid in the ketchup will react with the metal tin, forming a metal acetate that will pass into the ketchup which leads to its contamination.
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