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Chemistry |
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| 301)Which one of the following is not a chemical change? | |||
| Carbondioxide turning lime water milky | Glowing of platinum wire in a non-luminous bunsen flame | ||
| Rusting of Iron | Darkening of silver chloride in light | ||
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| 302)Find the wrong statement | |||
| Mole is short form of molecule | Atom is not indestructible | ||
| Mass of reactants and mass of product is equal | The volume of one mole of gas at NTP is 22.4 litre | ||
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| 303)Avogadro's number represents the number of atoms or molecules present in | |||
| 1gm of substance | 1 cc of gas at NTP | ||
| 22.4 litre of gas at NTP | 1 mole of substance | ||
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| 304)Spot the wrong statement? | |||
| Paints are mixture | Alloys are mixture | ||
| Petrol is a mixture | Bleaching powder is a mixture | ||
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| 305)Sugar can be separated from its aqueous solution by- | |||
| distilization | crystallization | ||
| filtration | boiling | ||
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| 306)Which one of the following is a compound? | |||
| Gold | Milk | ||
| Water | coal | ||
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| 307)Which one of the following represents water gas? | |||
| CO + N2 | CO + H2 | ||
| H2 + N2 | CO2 + H2 | ||
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| 308)Allotropic forms of an element have | |||
| same chemical properties | same physical properties | ||
| same chemical properties but different physical properties | different chemical properties | ||
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| 309)Normal atmospheric pressure is- | |||
| 76mm | 760mm | ||
| 75mm | 75cm | ||
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| 310)Water is a compound because? | |||
| It contains two different elements and are joined by chemical bonds | It contains oxygen and hydrogen | ||
| It exists in three different states | The elements can not be separated by chemical process | ||
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| 311)Chemical properties are periodic function of atomic number. This is true because of- | |||
| the chemical properties of an element depends upon the number of extra nuclear electrons | this gives a clear indication that the number of extra nuclear electrons is equal to the number of protons in the nucleous of element | ||
| the atomic number is a whole number and makes the chemical calculation easier | elements exist in several isotopic forms with different mass numbers and it is difficult to choose the suitable isotope | ||
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| 312)Standard atmospheric temperature is- | |||
| 200C | 100C | ||
| 50C | 00C | ||
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| 313)Which one of the following is the basic principle of Hydrogen bomb? | |||
| Nuclear fusion | Nuclear Fission | ||
| Nuclear spliting | Nuclear disintegration | ||
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| 314)Radio activity was discovered by - | |||
| Rutherford | Henry Becquarel | ||
| Madam Curie | Pierre Curie | ||
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| 315)The liquid used as coolent in nuclear reactors is- | |||
| Alcohol | Ordinary water | ||
| Heavy water | Hard water | ||
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