At present how many elements are known to us?

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Question:
At present how many elements are known to us?

1.118

2.119

3.120

4.117

Posted Date:-2021-03-07 09:39:46

More MCQS Questions and answers

  1. A compound formed from an acid by the replacement of the hydrogen in the acid by a metal is called:
  2. A negatively charged particle found in the atoms of all elements is called:
  3. A neutral particle found in the nucleus of an atom is called:
  4. A positively charged particle found in the atoms of all elements is called:
  5. A small positively charged part at the centre of an atom is called:
  6. An unsaturated hydrocarbon in which two carbon atoms are connected by a triple bond is called:
  7. Aromatic hydrocarbons are also known as ........... ?
  8. At present how many elements are known to us?
  9. Atoms of the same element having the same atomic number but different mass number are called:
  10.  A positively and negatively charged atom or group of atoms is called:
  11.  Name a metal oxide which is acidic and basic in nature?
  12.  Which of the following statement is not true about metals?
  13.  Why alkanes are known as saturated hydrocarbon?
  14.  Why Aluminium is used for making cooking utensils?
  15. Compounds that contain carbon are called:
  16. In water alkanes are .......... ?
  17. In which hydrocarbon all the four valencies of carbon are linked together with single bond?
  18. An electrically neutral group of two or more atoms chemically bonded together is called:
  19. Name a hydrocarbon which is a main component of natural gas?
  20. Name a metal which is used in making airplanes?
  21. Name an open chain hydrocarbon which is odourless?
  22. Name an organic compound in which RCOOCOR is a functional group?
  23. Name the property of metal in which it can be drawn into thin wires?
  24. Other than mercury which other metal is liquid at room temperature?
  25. Ringing bells in the temples are made up of:
  26. The atomic number of four elements P, Q, R, S are 6, 8, 10 and 12 respectively. The two elements which can react to form ionic compounds are:
  27. The chemical bond formed by the sharing of electrons between two atoms is known as:
  28. The organic compounds having the same molecular formula but different structures are called:
  29. The scale on which the strength of acid solutions as well as basic solutions could be represented by making use of hydrogen ion concentrations in them is called:
  30. The solution of one of the following compounds will conduct electricity. This compound is:
  31. The study of heat flow is called:
  32. Those chemical substances which have a bitter taste are:
  33. Those chemical substances which have a sour taste are:
  34. Those reactions in which two or more substances combine to form a single substance is called:
  35. What are the different physical forms in which an element can exist called?
  36. What is a homogeneous mixture of two or more metals called?
  37. What is an unsaturated hydrocarbon in which the two carbon atoms are connected by a double bond called?
  38. What is the chemical bond formed by the transfer of electrons from one atom to another is called?
  39. What is the general formula of alkenes?
  40. What is the mixing of air into a liquid or solid called?
  41. What is the old name of alkenes?
  42. What is the part of the solution that dissolves the solute called?
  43. What is the process called when a compound combines with oxygen gas to form water, heat and carbon dioxide?
  44. What is the substance that has an unstable nucleus that can fall apart called?
  45. When a gas moves through an opening into a chamber that contains no pressure, it is called:
  46. When a substance loses electrons, it is called:
  47. Which compound is used for making perfumes and dyes?
  48. Which of the following metal can be cut down with the help of knife?
  49. Which of the following statement is true about ionic compounds?
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