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Chemistry

General Knowledge on Chemistry

(Click on suggested Options to select the answer | Color Red means : Wrong & Green Means: Correct)
21. Dirty clothes containing grease and oil stains are cleaned by adding detergents to water. Stains are removed because detergent
  • A. reduces drastically the surface tension between water and oil
  • B. increases the surface tension between water and oil
  • C. increases the viscosity of water and oil
  • D. decreases the viscosity in detergent mixed water
  • Check Answer | Discussion
22. Alcohol obtained in the saponification process is
23. The melting points and boiling points of the transition elements are higher than the corresponding s-block elements. Then which one among the following statements is correct?
  • A. Transition elements have smaller size
  • B. Presence of one or more unpaird electrons contributing to higher atomic forces on account of covalent bond
  • C. Presence of strong metallic bond due to small size and higher ionisation energy
  • D. Presence of vacant d-orbital
  • Check Answer | Discussion
24. Which of the following is correct for the semiconductor?
  • A. A large gap between filed band and vacant band
  • B. An impurity band present between filled band and vacant band.
  • C. A small gap between filled band and vacant band.
  • D. Filled band and vacant band overlap with one another
  • Check Answer | Discussion
25. Which one among the following statement about an atom is not correct?
  • A. Atoms always combine to from molecule
  • B. Atoms are the basic units from which molecules and ions are formed
  • C. Atoms are always neutral in nature
  • D. Atoms aggregate in large numbers to from the matter that we can see, feel and touch
  • Check Answer | Discussion
26. Which one among the following metal ions is essential for erythropoesis in human beings?
27. The biological specimens in laboratory are preserved in the glass containing formalin. What is the "formalin"?
  • A. An aqueous solution of HNO3
  • B. An aqueous solution of H2SO4
  • C. An aqueous solution of formaldehyde
  • D. Concentrated solution of HNO3
  • Check Answer | Discussion
28. The pH of fresh groundwater slightly decreases upon exposure to air because
  • A. carbon dioxide from air is dissolved in the water
  • B. oxygen from air is dissolved in the water
  • C. the dissolved carbon dioxide of the groundwater escapes into air
  • D. the dissolved oxygen of the groundwater escapes into air
  • Check Answer | Discussion
29. Which one among the following statements is correct?
  • A. All bases are alkalis
  • B. None of the basis is alkali
  • C. There are no more bases except the alkalis
  • D. All alkalis are bases but all bases are not alkalis
  • Check Answer | Discussion
30. The ability of geckos which can hang on a glass surface using only one toe and to climb on sheer surface has been attributed to the

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