A) Acetylene |
B) ethane |
C) carbon dioxide |
D) acetylene |
A) Acetylene |
1). The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
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2). The method that cannot be used for removing permanent hardness of water is
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3). The mineral containing both magnesium and calcium is
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4). The main chemical constituent of clay is
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5). The major constituent of air is
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6). The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is
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7). The iron ore magnetite consists of
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8). The high reactivity of fluorine is due to
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9). The inexpensive and commonly used variety of glass is called soda glass. It is called so because
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10). The mass number of a nucleus is
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