Chemistry problems
- 1. Which of the following is not a semiconductor?
Options- A. CdS
- B. NaCl
- C. Si
- D. Ge Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: NaCl
Explanation:
Semiconductors are those materials that are neither good conductors nor the good insulators of heat and electricity. Silicon (Si), Germanium (Ge) and Cadmium Sulphide (CdS) are semiconductors which work as conductors in some special conditions only.
- 2. Radioactive decay is likely to occur when
Options- A. an atom has too many neutrons or protons
- B. protons break into neutrons and electrons
- C. an atom has too many electrons
- D. atoms collide with one another Also asked in: AIEEE, Bank Exams, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: an atom has too many neutrons or protons
Explanation:
Radioactive decay is likely to occur when the nuclei of an atom doesn't have enough binding energy to hold the nucleus together due to excess of rotons or nutrons in it.
- 3. The compound MgCl2 is named
Options- A. Magnesium Chloride
- B. Magnesium Chlorine
- C. Magnesium Dichloride
- D. Dimagnesium Chloride Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: Magnesium Chloride
Explanation:
The compound MgCl2 is named as Magnesium Chloride.
- 4. Barbituric Acid was synthesized in 1864 by
Options- A. Adolf von Baeyer
- B. Marie Curie
- C. Mendeleev
- D. John Dalton Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: Adolf von Baeyer
Explanation:
German Chemist, Adolf von Baeyer first synthesized Barbituric Acid in 1864.
- 5. The first two steps in the lithification process are
Options- A. Cementation and Proposal
- B. Compaction and Ratification
- C. Compaction and Cementation
- D. Ratification and Cementation Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk
Correct Answer: Compaction and Cementation
Explanation:
The first two steps in the lithification process are Compaction and Cementation.
- 6. Which has the lowest freezing point?
Options- A. Mercury
- B. Helium
- C. Cesium
- D. Aluminium Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO, IT Trainer
Correct Answer: Helium
Explanation:
Helium has the lowest freezing point of all the elements. When coming to metals, mercury has the lowest freezing point of all the metals.
- 7. Which gas is used for the preparation of Soda water?
Options- A. Carbon Dioxide
- B. Oxygen
- C. Hydrogen
- D. Ammonia Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Carbon Dioxide
- 8. Which characteristic is a property of molecular substances?
Options- A. good heat conductivity
- B. high melting point
- C. good heat conductivity
- D. low melting point Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: low melting point
Explanation:
The substances in which two or more atoms are attached together are called as molecular substances.
Properties of molecular substances ::
1. Molecular substances are bonded with covalent bonds
2. Bad heat conductivity
3. Bad electrical conductivity
4. Have low melting points.
- 9. Elements that are poor conductors of heat and electricity are
Options- A. Metals
- B. Non metals
- C. Halogens
- D. Noble Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: Non metals
Explanation:
Elements that are poor conductors of heat and electricity are called Non metals.
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