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question_answer1)
Which one of the following pairs of gases contains the same number of molecules [EAMCET 1987]
A)
16 g of \[{{O}_{2}}\]and 14 g of \[{{N}_{2}}\] done
clear
B)
8 g of \[{{O}_{2}}\]and 22 g of \[C{{O}_{2}}\] done
clear
C)
28 g of \[{{N}_{2}}\]and 22 g of \[C{{O}_{2}}\] done
clear
D)
32 g of \[{{O}_{2}}\]and 32 g of \[{{N}_{2}}\] done
clear
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question_answer2)
Number of gm of oxygen in 32.2 g \[N{{a}_{2}}S{{O}_{4}}.10{{H}_{2}}O\]is [Haryana PMT 2000]
A)
20.8 done
clear
B)
22.4 done
clear
C)
2.24 done
clear
D)
2.08 done
clear
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question_answer3)
250 ml of a sodium carbonate solution contains 2.65 grams of \[N{{a}_{2}}C{{O}_{3}}\]. If 10 ml of this solution is diluted to one litre, what is the concentration of the resultant solution (mol. wt. of \[N{{a}_{2}}C{{O}_{3}}\]=106) [EAMCET 2001]
A)
0.1 M done
clear
B)
0.001 M done
clear
C)
0.01 M done
clear
D)
\[{{10}^{-4}}\,\]M done
clear
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question_answer4)
A molar solution is one that contains one mole of a solute in [IIT 1986]
A)
1000 g of the solvent done
clear
B)
One litre of the solvent done
clear
C)
One litre of the solution done
clear
D)
22.4 litres of the solution done
clear
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question_answer5)
The number of oxygen atoms in 4.4 g of \[C{{O}_{2}}\]is approx. [CBSE PMT 1990]
A)
\[1.2\times {{10}^{23}}\] done
clear
B)
\[6\times {{10}^{22}}\] done
clear
C)
\[6\times {{10}^{23}}\] done
clear
D)
\[12\times {{10}^{23}}\] done
clear
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question_answer6)
The volume occupied by 4.4 g of \[C{{O}_{2}}\]at STP is [AFMC 1997, 2004; Pb. CET 1997, 2002]
A)
22.4 L done
clear
B)
2.24 L done
clear
C)
0.224 L done
clear
D)
0.1 L done
clear
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question_answer7)
The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is [DCE 2000]
A)
\[6.023\times {{10}^{19}}\] done
clear
B)
\[1.084\times {{10}^{18}}\] done
clear
C)
\[4.84\times {{10}^{17}}\] done
clear
D)
\[6.023\times {{10}^{23}}\] done
clear
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question_answer8)
One mole of calcium phosphide on reaction with excess of water gives [IIT 1999]
A)
One mole of phosphine done
clear
B)
Two moles of phosphoric acid done
clear
C)
Two moles of phosphine done
clear
D)
One mole of phosphorus pentoxide done
clear
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question_answer9)
19.7 kg of gold was recovered from a smuggler. How many atoms of gold were recovered (Au =197) [Pb. CET 1985]
A)
100 done
clear
B)
\[6.02\times {{10}^{23}}\] done
clear
C)
\[6.02\times {{10}^{24}}\] done
clear
D)
\[6.02\times {{10}^{25}}\] done
clear
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question_answer10)
The total number of protons in 10 g of calcium carbonate is (\[{{N}_{0}}=6.023\times {{10}^{23}}\])
A)
\[1.5057\times {{10}^{24}}\] done
clear
B)
\[2.0478\times {{10}^{24}}\] done
clear
C)
\[3.0115\times {{10}^{24}}\] done
clear
D)
\[4.0956\times {{10}^{24}}\] done
clear
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question_answer11)
The number of molecules in 16 g of methane is
A)
\[3.0\times {{10}^{23}}\] done
clear
B)
\[6.02\times {{10}^{23}}\] done
clear
C)
\[\frac{16}{6.02}\times {{10}^{23}}\] done
clear
D)
\[\frac{16}{3.0}\times {{10}^{23}}\] done
clear
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question_answer12)
Number of molecules in 100 ml of each of \[{{O}_{2}},\,N{{H}_{3}}\text{ and}\,C{{O}_{2}}\]at STP are [Bihar MADT 1985]
A)
In the order \[C{{O}_{2}}<{{O}_{2}}<N{{H}_{3}}\] done
clear
B)
In the order \[N{{H}_{3}}<{{O}_{2}}<C{{O}_{2}}\] done
clear
C)
The same done
clear
D)
\[N{{H}_{3}}=C{{O}_{2}}<{{O}_{2}}\] done
clear
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question_answer13)
The molecular weight of hydrogen peroxide is 34. What is the unit of molecular weight [MP PMT 1986]
A)
\[g\] done
clear
B)
\[mol\] done
clear
C)
\[g\,mo{{l}^{-1}}\] done
clear
D)
\[mol\,{{g}^{-1}}\] done
clear
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question_answer14)
The number of water molecules in 1 litre of water is [EAMCET 1990]
A)
18 done
clear
B)
\[18\times 1000\] done
clear
C)
\[{{N}_{A}}\] done
clear
D)
\[55.55\,{{N}_{A}}\] done
clear
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question_answer15)
The number of electrons in a mole of hydrogen molecule is [CPMT 1987]
A)
\[6.02\times {{10}^{23}}\] done
clear
B)
\[12.046\times {{10}^{23}}\] done
clear
C)
\[3.0115\times {{10}^{23}}\] done
clear
D)
Indefinite done
clear
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question_answer16)
The numbers of moles of \[BaC{{O}_{3}}\]which contain 1.5 moles of oxygen atoms is [EAMCET 1991]
A)
0.5 done
clear
B)
1 done
clear
C)
3 done
clear
D)
\[6.02\times {{10}^{23}}\] done
clear
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question_answer17)
Which of the following is Loschmidt number
A)
\[6\times {{10}^{23}}\] done
clear
B)
\[2.69\times {{10}^{19}}\] done
clear
C)
\[3\times {{10}^{23}}\] done
clear
D)
None of these done
clear
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question_answer18)
How many molecules are present in one gram of hydrogen [AIIMS 1982]
A)
\[6.02\times {{10}^{23}}\] done
clear
B)
\[3.01\times {{10}^{23}}\] done
clear
C)
\[2.5\times {{10}^{23}}\] done
clear
D)
\[1.5\times {{10}^{23}}\] done
clear
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question_answer19)
The total number of gm-molecules of \[S{{O}_{2}}C{{l}_{2}}\] in \[13.5g\] of sulphuryl chloride is [CPMT 1992]
A)
0.1 done
clear
B)
0.2 done
clear
C)
0.3 done
clear
D)
0.4 done
clear
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question_answer20)
The largest number of molecules is in [BHU 1997]
A)
\[34g\] of water done
clear
B)
\[28g\] of \[C{{O}_{2}}\] done
clear
C)
\[46g\] of \[C{{H}_{3}}OH\] done
clear
D)
\[54g\] of \[{{N}_{2}}{{O}_{5}}\] done
clear
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question_answer21)
The number of moles of sodium oxide in \[620g\] of it is [BHU 1992]
A)
1 mol done
clear
B)
10 moles done
clear
C)
18 moles done
clear
D)
100 moles done
clear
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question_answer22)
\[2g\] of oxygen contains number of atoms equal to that in [BHU 1992]
A)
\[0.5g\] of hydrogen done
clear
B)
\[4g\] of sulphur done
clear
C)
\[7g\] of nitrogen done
clear
D)
\[2.3g\] of sodium done
clear
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question_answer23)
Molarity of liquid \[HCl\] with density equal to \[1.17g/cc\] is [CBSE PMT 2001]
A)
36.5 done
clear
B)
18.25 done
clear
C)
32.05 done
clear
D)
4.65 done
clear
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question_answer24)
How many atoms are contained in one mole of sucrose \[({{C}_{12}}{{H}_{22}}{{O}_{11}})\] [Pb. PMT 2002]
A)
\[45\times 6.02\times {{10}^{23}}\] atoms/mole done
clear
B)
\[5\times 6.62\times {{10}^{23}}\] atoms/mole done
clear
C)
\[5\times 6.02\times {{10}^{23}}\] atoms/mole done
clear
D)
None of these done
clear
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question_answer25)
The number of molecules of CO2 present in 44g of CO2 is [BCECE 2005]
A)
\[6.0\times {{10}^{23}}\] done
clear
B)
\[3\times {{10}^{23}}\] done
clear
C)
\[12\times {{10}^{23}}\] done
clear
D)
\[3\times {{10}^{10}}\] done
clear
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question_answer26)
A sample of phosphorus trichloride \[(PC{{l}_{3}})\] contains 1.4 moles of the substance. How many atoms are there in the sample [Kerala PMT 2004]
A)
4 done
clear
B)
5.6 done
clear
C)
\[8.431\times {{10}^{23}}\] done
clear
D)
\[3.372\times {{10}^{24}}\] done
clear
E)
\[2.409\times {{10}^{24}}\] done
clear
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question_answer27)
The number of sodium atoms in 2 moles of sodium ferrocyanide is [BHU 2004]
A)
\[12\times {{10}^{23}}\] done
clear
B)
\[26\times {{10}^{23}}\] done
clear
C)
\[34\times {{10}^{23}}\] done
clear
D)
\[48\times {{10}^{23}}\] done
clear
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