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The greatest discovery of all time is that a person can change his future by merely changing his attitude.
- Oprah Winfrey
अब तक की सबसे बड़ी खोज है कि इंसान सिर्फ अपना नजरिया बदल के अपना भविष्य बदल सकता है |
- ओपरा विनफ्रे

    Chemistry Question & Answer in English

Who is regarded as father of modern chemistry?
A.  Rutherford
B.  Einstein
C.  Lavoisier
D.  C.V. Raman

The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is - 
A.  22
B.  2
C.  38
D.  20

Which of the following is also known as Laughing gas -
A.  Nitric oxide
B.  Nitrous oxide
C.  Nitrogen penta oxide
D.  Nitrogen

Which of the following is not a type of element -
A.  Metals
B.  Non- metals
C.  Gases
D.  Metalloids

pH value of water is -
A.  4
B.  7
C.  12
D.  18