The process of combustion in absence of oxygen is ………..
A) Incineration
B) Pyrolysis
C) Burning
D) Oxidation
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How heat transfer occurs through radiation in absence of a medium?
1. All objects possess thermal energy due to their temperature T(T > 0 K). 2. The rapidly moving molecules of a hot body emit EM waves travelling with the velocity of...
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Which of the following is CORRECT? (A) 1 mole of oxygen atoms contains 6.0221367 × 10^(23) atoms of oxygen.
(D) All of these 1 mole of atom or ions or molecule or particle contains \(6.0221367 × 10^{23}\) atoms, or ions or molecules or particles respectively. Hence, option (D) is right answer.
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The chemical process in which the ore is heated in the absence of air is called ……………..
B) Calcination
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The ratio of molecular weight of hydrogen and oxygen in water is 1 : 8. (The relation between hydrogen and oxygen in linear
Correct option is (A) y = 8x \(\because\) Quantities of hydrogen and oxygen are x and y and their quantity are in ratio 1 : 8. \(\therefore\) x : y = 1 : 8 \(\Rightarrow\) \(\frac xy=\frac18\) \(\Rightarrow\) y =...
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The ratio of molecular weight of hydrogen and oxygen in water is 1 : 8. (The relation between hydrogen and oxygen in linear
2 Answers
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The oxidation number of oxygen is …………. in oxygen difluoride.
Correct option is: (C) +2 The oxidation number of oxygen is +2 in oxygen difluoride because fluorine is more electronegative than oxygen.
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The oxidation number of oxygen is …………. in oxygen difluoride.
2 Answers
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Assertion . Molecular nitrogen is less reactive than molecular oxygen. Reason. The bond length of `N_(2)` is shorter than that of oxygen .
Correct Answer - a R is the correct explanation of A .
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Statement-1 . Sodium reacts with oxygen to form `Na_(2)O_(2)` but potassium reacts with oxygen to form `KO_(2)`. Statement-2 . Potassium is more react
Correct Answer - b Correct explanation . Due to bigger size of `K^(+)` than `Na^(+)`, it has a weak positive field around it which cannot prevent peroxide ion `(O_(2)^(2-))` to combine...
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Statement-1 : In the combustion of ethane, limiting reactant is ethane Statement-2 : Oxygen in air is always present in excess.
Correct Answer - A Statement-2 is the correct explanation for statement-1
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