Chemistry Questions and Answers
General Knowledge Chemistry Questions with Answers cover chemical reactions, elements, and compounds. These are important in SSC, RRB, and B.Ed exams to develop basic scientific understanding
Chemistry
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71 questions
31. The mass of one Avogadro number of helium atom is
- 1.00 gram
- 4.00 gram
- 8.00 gram
- 4 x 6.02 x 1023 gram
32. The items amenable to detection by soft x-rays are
- contrabands
- lead in bullets
- narcotics
- genuine coins from counterfeit coins
33. The material which can be deformed permanently by heat and pressure is called a
- thermoplastic
- thermoset
- chemical compound
- polymer
34. The mass number of a nucleus is
- always less than its atomic number
- the sum of the number of protons and neutrons present in the nucleus
- always more than the atomic weight
- a fraction
35. The inexpensive and commonly used variety of glass is called soda glass. It is called so because
- was used initially for making bottles of soda(carbonated drink)
- is made using soda(sodium carbonate)
- was initially used for storing sodium carbonate
- is made using soda lime
36. The gas used in the manufacture of vanaspati from vegetable oil is
- hydrogen
- oxygen
- nitrogen
- carbon dioxide
37. The graphite rods in the nuclear reactor
- react with U to release energy
- produce neutrons
- undergo combustion which triggers the nuclear fission
- convert fast moving neutrons into thermal neutrons
40. The method that cannot be used for removing permanent hardness of water is
- adding sodium carbonate
- distillation
- adding caustic soda
- boiling