| 1 |
Basicity of ortho phosphoric acid is. |
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| 2 |
In group VA elements the most electronegative elements is. |
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| 3 |
The brown gas formed when metal reduces HNO3 is |
- A. N2O5
- B. N2O3
- C. NO2
- D. NO
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| 4 |
Arsenic impurities in contact process are removed. |
- A. By prolong heating the gases
- B. By treatment with Fe(OH)3
- C. In scrubbing tower
- D. In absorption tower
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| 5 |
What is %age of calcium phosphate in bone ash |
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| 6 |
Maximum number of unpaired electrons is in |
- A. O<sub>2</sub>
- B. O<sub>2</sub><sup>+</sup>
- C. O<sub>2</sub><sup>-</sup>
- D. O<sub>2</sub><sup>2-</sup>
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| 7 |
Out of the elements of group VA, the highest energy is possessed by |
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| 8 |
Which of the following is a reddish brown gas |
- A. N<sub>2</sub>O<sub>3</sub>
- B. NO<sub>2</sub>
- C. N<sub>2</sub>O<sub>3</sub>
- D. N<sub>2</sub>O<sub>5</sub>
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| 9 |
In which substance phosphorus is not present. |
- A. Yolk of egg
- B. Bones
- C. Apatite
- D. Galena
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| 10 |
Which of the following specie has the maximum number of unpaired electrons. |
- A. O2
- B. O2+
- C. O2-
- D. O2<sup>-2</sup>
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