| 1 |
The equation of relationship between atomic number (Z) and mass number (A) is |
- A. A = Z + N
- B. A = Z - n
- C. A = Z
- D. A =2Z + n
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| 2 |
The No. of atoms in 1 mole of carbiton is |
- A. 6.02 x 1021
- B. 6.02 x 1022
- C. 6.02 x 1023
- D. 6.02 x 1024
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| 3 |
The valency of nitrogen is |
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| 4 |
The most abundant element occurring in the oceans is:<br> |
- A. Oxygen <br>
- B. Hydrogen <br>
- C. Nitrogen <br>
- D. Silicon <br>
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| 5 |
All chemists invented all except: |
- A. Beakers
- B. Spirit lamp
- C. Funnels
- D. Retorts
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| 6 |
The formula of benzene is _________ |
- A. C6H6O3
- B. C6H6
- C. C12H22
- D. Nil
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| 7 |
It is heterogeneous mixture |
- A. Sand
- B. Milk
- C. Air
- D. Brass
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| 8 |
Sort out a compound from the following |
- A. Air
- B. Salt
- C. Ice-cream
- D. Iron
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| 9 |
Neutrons have _________ charge. |
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| 10 |
The period of Alchemists extends from _________ AD. |
- A. 800 to 1800
- B. 600 to 1600
- C. 900 to 1900
- D. 700 to 1700
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