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question_answer1)
A picometre is written as
A)
\[{{10}^{-9}}\]m done
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B)
\[{{10}^{-10}}\]m done
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C)
\[{{10}^{-11}}\]m done
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D)
\[{{10}^{-12}}\]m done
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question_answer2)
Given \[P=0.0030m\], \[Q=2.40m\], \[R=3000m\], Significant figures in \[P,\,Q\] and \[R\] are respectively
A)
2, 2, 1 done
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B)
2, 3, 4 done
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C)
4, 2, 1 done
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D)
4, 2, 3 done
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question_answer3)
The percentage of copper and oxygen in samples of \[CuO\] obtained by different methods were found to be the same. This illustrates the law of
A)
Constant proportions done
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B)
Conservation of mass done
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C)
Multiple proportions done
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D)
Reciprocal proportions done
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question_answer4)
Hydrogen combines with oxygen to form \[{{H}_{2}}O\] in which 16 g of oxygen combine with 2 g of hydrogen. Hydrogen also combines with carbon to form \[C{{H}_{4}}\] in which 2 g of hydrogen combine with 6 g of carbon. If carbon and oxygen combine together then they will do show in the ratio of
A)
6 : 16 or 12 : 32 done
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B)
6 : 18 done
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C)
1 : 2 done
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D)
12 : 24 done
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question_answer5)
The modern atomic weight scale is based on
A)
\[{{C}^{12}}\] done
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B)
\[{{O}^{16}}\] done
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C)
\[{{H}^{1}}\] done
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D)
\[{{C}^{13}}\] done
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question_answer6)
7.5 grams of a gas occupy 5.8 litres of volume at STP the gas is
A)
\[NO\] done
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B)
\[{{N}_{2}}O\] done
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C)
\[CO\] done
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D)
\[C{{O}_{2}}\] done
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question_answer7)
A gaseous mixture contains \[C{{H}_{4}}\] and \[{{C}_{2}}{{H}_{6}}\] in equimolecular proportion. The weight of 2.24 litres of this mixture at NTP is
A)
4.6 g done
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B)
1.6 g done
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C)
2.3 g done
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D)
23 g done
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question_answer8)
Equivalent weight of a bivalent metal is 37.2. The molecular weight of its chloride is
A)
412.2 done
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B)
216 done
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C)
145.4 done
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D)
108.2 done
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question_answer9)
The number of oxygen atoms in 4.4 g of \[C{{O}_{2}}\]is approx.
A)
\[1.2\times {{10}^{23}}\] done
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B)
\[6\times {{10}^{22}}\] done
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C)
\[6\times {{10}^{23}}\] done
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D)
\[12\times {{10}^{23}}\] done
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question_answer10)
The numbers of moles of \[BaC{{O}_{3}}\]which contain 1.5 moles of oxygen atoms is
A)
0.5 done
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B)
1 done
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C)
3 done
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D)
\[6.02\times {{10}^{23}}\] done
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question_answer11)
The percentage of oxygen in \[NaOH\] is
A)
40 done
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B)
60 done
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C)
8 done
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D)
10 done
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question_answer12)
In which of the following pairs of compounds the ratio of C, H and O is same
A)
Acetic acid and methyl alcohol done
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B)
Glucose and acetic acid done
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C)
Fructose and sucrose done
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D)
All of these done
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question_answer13)
2.76 g of silver carbonate on being strongly heated yield a residue weighing
A)
2.16 g done
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B)
2.48 g done
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C)
2.64 g done
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D)
2.32 g done
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question_answer14)
Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be
A)
26.89 done
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B)
8.9 done
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C)
17.8 done
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D)
26.7 done
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question_answer15)
Number of moles of \[KMn{{O}_{4}}\]required to oxidize one mole of \[Fe({{C}_{2}}{{O}_{4}})\]in acidic medium is
A)
0.6 done
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B)
0.167 done
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C)
0.2 done
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D)
0.4 done
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question_answer16)
\[1.5\] mol of \[{{O}_{2}}\] combine with \[Mg\] to form oxide \[MgO\]. The mass of \[Mg\] (at. mass 24) that has combined is
A)
\[72\ g\] done
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B)
\[36\ g\] done
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C)
\[48\ g\] done
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D)
\[24\ g\] done
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question_answer17)
One atmosphere is equal to
A)
101.325 K pa done
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B)
1013.25 K pa done
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C)
\[{{10}^{5}}\]Nm done
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D)
None of these done
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question_answer18)
81.4 g sample of ethyl alcohol contains 0.002 g of water. The amount of pure ethyl alcohol to the proper number of significant figures is
A)
81.398 g done
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B)
71.40 g done
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C)
91.4 g done
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D)
81 g done
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question_answer19)
A sample was weighted using two different balances. The results were (i) 3.929 g (ii) 4.0 g. How would the weight of the sample be reported?
A)
3.929 g done
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B)
3 g done
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C)
3.9 g done
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D)
3.93 g done
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question_answer20)
Two elements X and Y have atomic weights of 14 and 16. They form a series of compounds A, B, C, D and E in which the same amount of element X, Y is present in the ratio 1 : 2 : 3 : 4 : 5. If the compound A has 28 parts by weight of X and 16 parts by weight of Y, then the compound of C will have 28 parts weight of X and
A)
32 parts by weight of Y done
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B)
48 parts by weight of Y done
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C)
64 parts by weight of Y done
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D)
80 parts by weight of Y done
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question_answer21)
The law of multiple proportions is illustrated by the two compounds
A)
Sodium chloride and sodium bromide done
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B)
Ordinary water and heavy water done
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C)
Caustic soda and caustic potash done
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D)
Sulphur dioxide and sulphur trioxide done
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question_answer22)
The law of definite proportions is not applicable to nitrogen oxide because
A)
Nitrogen atomic weight is not constant done
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B)
Nitrogen molecular weight is variable done
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C)
Nitrogen equivalent weight is variable done
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D)
Oxygen atomic weight is variable done
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question_answer23)
When 100 ml of 1\[M\,NaOH\]solution and 10 ml of 10\[N\,{{H}_{2}}S{{O}_{4}}\]solution are mixed together, the resulting solution will be
A)
Alkaline done
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B)
Acidic done
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C)
Strongly acidic done
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D)
Neutral done
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question_answer24)
One litre of a gas at STP weight 1.16 g it can possible be
A)
\[{{C}_{2}}{{H}_{2}}\] done
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B)
\[CO\] done
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C)
\[{{O}_{2}}\] done
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D)
\[C{{H}_{4}}\] done
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question_answer25)
Rearrange the following (I to IV) in the order of increasing masses and choose the correct answer from , , and (Atomic mass: N=14, O=16, Cu=63). |
1 molecule of oxygen |
1 atom of nitrogen |
\[1\times {{10}^{-10}}\]g molecular weight of oxygen |
\[1\times {{10}^{-10}}\]g atomic weight of copper |
A)
II<I<III<IV done
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B)
IV<III<II<I done
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C)
II<III<I<IV done
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D)
III<IV<I<II done
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question_answer26)
Vapour density of a metal chloride is 66. Its oxide contains 53% metal. The atomic weight of the metal is
A)
21 done
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B)
54 done
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C)
27.06 done
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D)
2.086 done
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question_answer27)
\[4.4\ g\] of an unknown gas occupies \[2.24L\] of volume at standard temperature and pressure. The gas may be
A)
Carbon dioxide done
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B)
Carbon monoxide done
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C)
Oxygen done
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D)
Sulphur dioxide done
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question_answer28)
On reduction with hydrogen, 3.6 g of an oxide of metal left 3.2 g of metal. If the vapour density of metal is 32, the simplest formula of the oxide would be
A)
\[MO\] done
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B)
\[{{M}_{2}}{{O}_{3}}\] done
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C)
\[{{M}_{2}}O\]0 done
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D)
\[{{M}_{2}}{{O}_{5}}\] done
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question_answer29)
One mole of calcium phosphide on reaction with excess of water gives
A)
One mole of phosphine done
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B)
Two moles of phosphoric acid done
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C)
Two moles of phosphine done
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D)
One mole of phosphorus pentoxide done
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question_answer30)
How many molecules are present in one gram of hydrogen
A)
\[6.02\times {{10}^{23}}\] done
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B)
\[3.01\times {{10}^{23}}\] done
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C)
\[2.5\times {{10}^{23}}\] done
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D)
\[1.5\times {{10}^{23}}\] done
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question_answer31)
A compound (80 g) on analysis gave C = 24 g, H = 4 g, O = 32 g. Its empirical formula is
A)
\[{{C}_{2}}{{H}_{2}}{{O}_{2}}\] done
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B)
\[{{C}_{2}}{{H}_{2}}O\] done
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C)
\[C{{H}_{2}}{{O}_{2}}\] done
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D)
\[C{{H}_{2}}O\] done
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question_answer32)
Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (At. wt. of Fe = 56) present in one molecule of haemoglobin is
A)
6 done
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B)
1 done
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C)
4 done
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D)
2 done
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question_answer33)
How many g of a dibasic acid (Mol. wt. = 200) should be present in 100 ml of its aqueous solution to give decinormal strength
A)
1 g done
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B)
2 g done
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C)
10 g done
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D)
20 g done
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question_answer34)
To neutralise 20 ml of \[M/10\] sodium hydroxide, the volume of \[M/20\] hydrochloric acid required is
A)
10 ml done
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B)
15 ml done
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C)
20 ml done
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D)
40 ml done
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question_answer35)
A solution containing \[N{{a}_{2}}C{{O}_{3}}\] and NaOH requires 300 ml of 0.1 N HCl using phenolpthalein as an indicator. Methyl orange is then added to the above titrated solution when a further 25 ml of 0.2 N HCl is required. The amount of NaOH present in solution is \[(NaOH=40,\,N{{a}_{2}}C{{O}_{3}}=106)\]
A)
0.6 g done
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B)
1.0 g done
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C)
1.5 g done
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D)
2.0 g done
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question_answer36)
The ratio of amounts of \[{{H}_{2}}S\]needed to precipitate all the metal ions from 100 ml of 1 M \[AgN{{O}_{3}}\]and 100 ml of 1 M \[CuS{{O}_{4}}\]will be
A)
1:1 done
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B)
1:2 done
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C)
2:1 done
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D)
None of these done
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question_answer37)
What should be the weight and moles of \[AgCl\]precipitate obtained on adding 500ml of 0.20 M \[HCl\]in 30 g of \[AgN{{O}_{3}}\]solution? (\[AgN{{O}_{3}}\]= 170)
A)
14.35 g done
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B)
15 g done
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C)
18 g done
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D)
19 g done
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question_answer38)
What will be the volume of \[C{{O}_{2}}\]at NTP obtained on heating 10 grams of (90% pure) limestone
A)
22.4 litre done
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B)
2.016 litre done
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C)
2.24 litre done
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D)
20.16 litre done
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question_answer39)
\[Ca{{(OH)}_{2}}+{{H}_{3}}P{{O}_{4}}\to CaHP{{O}_{4}}+2{{H}_{2}}O\] the equivalent weight of \[{{H}_{3}}P{{O}_{4}}\] in the above reaction is
A)
21 done
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B)
27 done
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C)
38 done
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D)
49 done
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question_answer40)
How many grams of caustic potash required to completely neutralise 12.6 gm \[HN{{O}_{3}}\]
A)
22.4 KOH done
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B)
1.01 KOH done
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C)
6.02 KOH done
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D)
11.2 KOH done
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