| 1 |
Polymorphic substances have |
- A. Same physical and chemical properties
- B. Different physical and chemical properties.
- C. Same physical but different chemical properties
- D. Different physical and same chemical properties.
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| 2 |
Diamond is bad conductor because. |
- A. It has a tight structure
- B. It has a high density
- C. It is transparent to light
- D. There are o free electros present in the crystal of diamond to conduct electricity.
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| 3 |
Which of the given has hydrogen bonding. |
- A. CH4
- B. CCl4
- C. NH3
- D. NaCl
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| 4 |
Which is pseudo solid |
- A. CaF2
- B. Glass
- C. NaCl
- D. CaCl2
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| 5 |
In order to mention the oiling point of water at 110 <sup>o</sup>C, the external pressure should be. |
- A. Between 760 torr and 1200 torr
- B. Between 200 torr and 760 torr
- C. 765 torr
- D. Any value of pressure
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| 6 |
Allotropy is the property of. |
- A. Compound
- B. Element
- C. Atom
- D. Mixtuer
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| 7 |
A pressure cooker reduces cooking time because. |
- A. Heat is uniformly distributed
- B. Boiling point of water rises
- C. A large flame is used
- D. Vapour pressure of liquid reduces
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| 8 |
Which one of the following inter molecular forces are present in neon gas molecules. |
- A. Hydrogen bond
- B. dipole -Dipole attraction
- C. London dispersion force
- D. Hydrogen bonding and London dispersion force
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| 9 |
The boiling point of water at Murree Hills. |
- A. 90<sup>o</sup>C
- B. 98<sup>o</sup>C
- C. 100<sup>o</sup>C
- D. 120<sup>o</sup>C
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| 10 |
When external pressure is 23.7 torr, boiling point of water is |
- A. 100 <sup>o</sup>C
- B. 200<sup>o</sup>C
- C. 98<sup>o</sup>C
- D. 25<sup>o</sup>C
|