Discussion
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- Question
What is an endothermic reaction?
Options- A. Reaction in which heat is released.
- B. Reaction in which heat is absorbed.
- C. Reaction in which neither heat is released nor absorbed.
- D. None of these
- Correct Answer
- Reaction in which heat is absorbed.
- 1. What is the chemical formula for Sodium Chloride (Salt)?
Options- A. NaCl2
- B. NaCl
- C. Na2Cl
- D. Na2C Discuss
- 2. Anions are formed by _____.
Options- A. losing of electrons
- B. gaining of electrons
- C. gaining of neutrons
- D. losing of neutrons Discuss
- 3. Process of loosing electrons is known as _____.
Options- A. oxidation
- B. reduction
- C. radiation
- D. both oxidation and reduction Discuss
- 4. Ozone is an ______ of oxygen.
Options- A. Allotrope
- B. Isotope
- C. Isobar
- D. Isotone Discuss
- 5. 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
- 6. Which of the following is an ore of Aluminium?
Options- A. Galena
- B. Cryollite
- C. Cinnabar
- D. Epsom Salt Discuss
- 7. Which of the following gas was released during Bhopal gas tragedy?
Options- A. Methyl isocyanate
- B. Sodium isothiocyanate
- C. Nitrogen isothiocyanate
- D. Potassium isothiocyanate Discuss
- 8. Nylon threads are made of
Options- A. Polyester polymer
- B. Polyamide polymer
- C. Polyvinyl polymer
- D. Polysaccharide Discuss
- 9. What is nature of pH of Milk?
Options- A. Slightly Acidic
- B. Slightly Basic
- C. Highly Acidic
- D. Highly Basic Discuss
- 10. Which one of the following is not a semiconductor?
Options- A. Silicon
- B. Germanium
- C. Quartz
- D. Gallium arsenide Discuss
Chemistry problems
Search Results
Correct Answer: NaCl
Correct Answer: gaining of electrons
Correct Answer: oxidation
Correct Answer: Allotrope
Correct Answer: Twelve Months
Correct Answer: Cryollite
Correct Answer: Methyl isocyanate
Correct Answer: Polyamide polymer
Correct Answer: Slightly Acidic
Correct Answer: Quartz
Explanation:
Semiconductors are the basic materials used in the present solid state electronic devices like diode, transistor, ICs, etc. 2. Lattice structure and the atomic structure of constituent elements decide whether a particular material will be insulator, metal or semiconductor. Semiconductors are elemental (Si, Ge) as well as compound (GaAs, CdS, etc.). Silicon, Germanium, Gallium Arsenide are semiconductors, but Quartz is an insulator.
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