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question_answer1)
Which of the following is an incorrect statement?
A)
\[{{H}_{2}}{{O}_{2}}\]decomposes rapidly in presence of \[Mn{{O}_{2}}\] done
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B)
Ice at its melting point is lighter than water because ice crystals have hollow hexagonal arrangement of \[{{H}_{2}}O\]molecules. done
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C)
\[{{D}_{2}}O\]will have maximum density at \[11.5{}^\circ C\] done
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D)
Water gas contains greater proportion of CO than that of \[{{H}_{2}}\] done
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question_answer2)
Pick out the correct statement.
A)
By decreasing the temperature pure para-hydrogen can be obtained done
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B)
By increasing the temperature pure ortho-hydrogen can be obtained done
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C)
By decreasing the temperature pure ortho-Hydrogen can be obtained done
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D)
By increasing the temperature pure para-hydrogen can be obtained done
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question_answer3)
Out of the following metals which will give \[{{H}_{2}}\] on reaction with NaOH?
I: Zn, |
II: Mg, |
III: Al, |
IV: Be |
A)
I, II, III, IV done
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B)
I, II, IV done
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C)
II, IV done
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D)
I, III done
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question_answer4)
Deuteroammonia (\[N{{D}_{3}}\]) can be prepared
A)
by heating a solution of \[N{{H}_{4}}Cl\]in NaOD. done
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B)
by action of heavy water on magnesium nitride. done
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C)
by fractionation of ordinary ammonia. done
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D)
none of the above done
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question_answer5)
Lead pipes are not used for carrying drinking water because
A)
They are covered with a coating of lead carbonate done
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B)
They are corroded by air and moisture done
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C)
Water containing dissolved air attacks lead forming soluble hydroxide done
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D)
None of these done
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question_answer6)
Which of the following statements about \[{{H}_{2}}{{O}_{2}}\]is not true?
A)
\[{{H}_{2}}{{O}_{2}}\]Is used to clean oil paintings done
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B)
\[{{H}_{2}}{{O}_{2}}\]Acts as oxidizing as well as reducing agent done
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C)
Two hydroxyl groups in \[{{H}_{2}}{{O}_{2}}\]lie in the same plane done
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D)
None of these done
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question_answer7)
The amount of \[{{H}_{2}}{{O}_{2}}\] present in 1 L of 1.5 \[N{{H}_{2}}{{O}_{2}}\] solution is
A)
2.5 g done
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B)
25.5 g done
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C)
3.0 g done
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D)
8.0 g done
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question_answer8)
Hydrogen peroxide is now generally prepared on industrial scale by the
A)
action of \[{{H}_{2}}S{{O}_{4}}\]on barium peroxide done
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B)
action of \[{{H}_{2}}S{{O}_{4}}\]on sodium peroxide done
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C)
electrolysis of 50% \[{{H}_{2}}S{{O}_{4}}\] done
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D)
burning hydrogen in excess of oxygen done
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question_answer9)
At its melting point ice is lighter than water because
A)
\[{{H}_{2}}O\]molecules are more closely packed in solid state done
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B)
Ice crystals have hollow hexagonal arrangement of \[{{H}_{2}}O\]molecules done
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C)
On melting of ice the \[{{H}_{2}}O\]molecule shrinks in size done
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D)
Ice forms mostly heavy water on first melting done
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question_answer10)
The pair that yields the same gaseous product on reaction with water:
A)
K and \[K{{O}_{2}}\] done
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B)
Ca and \[Ca{{H}_{2}}\] done
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C)
Na and \[N{{a}_{2}}{{O}_{2}}\] done
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D)
Ba and \[Ba{{O}_{2}}\] done
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question_answer11)
100 mL of tap water containing Ca\[{{(HC{{O}_{3}})}_{2}}\], was titrated with \[N/50\text{ }HCl\] with methyl orange as indicator. If 30 mL of HCI were requireil. calculate the temporary hardness as part of \[CaC{{O}_{3}}\]per \[{{10}^{6}}\]parts of water.
A)
150 ppm done
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B)
600 ppm done
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C)
450 ppm done
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D)
300 ppm done
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question_answer12)
The exhausted permutit is generally regenerated by percolating through it a solution of
A)
sodium chloride done
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B)
calcium chloride done
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C)
magnesium chloride done
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D)
Water containing plum juice done
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question_answer13)
Plumbosolvency is a health hazard in the transportation of
A)
Hard water only done
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B)
Soft water only done
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C)
Both (a) and (b) done
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D)
Water containing plum juice done
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question_answer14)
Chemical (A) is used for water softening to remove temporary hardness. (A) reacts with sodium carbonate to generate caustic soda. When \[C{{O}_{2}}\]is bubbled through a solution of (A), it truns cloudy. What is the chemical formula of (A)?
A)
\[CaC{{O}_{3}}\] done
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B)
\[CaO\] done
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C)
\[Ca{{(OH)}_{2}}\] done
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D)
\[Ca{{(HC{{O}_{3}})}_{2}}\] done
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question_answer15)
There are three samples of \[{{H}_{2}}{{O}_{2}}\]labelled as 10 vol; 15 vol; 20 vol; Half litre of each sample is mixed and then diluted with equal volume of water. Calculate volume strength of the resultant solution.
A)
1.339 done
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B)
7.5 done
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C)
5.0 done
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D)
2.68 done
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question_answer16)
The hair dyes available in the market generally contain two bottles, one containing the dye and the other hydrogen peroxide. Before applying the dye, the two solutions are mixed. The hydrogen peroxide
A)
is added to dilute the solution of the dye done
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B)
acidifies the solution of the day done
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C)
reduces the dye to give the desired colour done
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D)
oxidizes the dye to give the desired colour done
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question_answer17)
The molecular formula of a commercial resin used for exchanging ions in water softening is \[{{C}_{8}}{{H}_{7}}S{{O}_{3}}Na\](mol. Wt. 206). What would be the maximum uptake of \[C{{a}^{2+}}\]ions by the resin when expressed in mole per gram resin?
A)
\[\frac{1}{103}\] done
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B)
\[\frac{1}{206}\] done
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C)
\[\frac{2}{309}\] done
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D)
\[\frac{1}{412}\] done
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question_answer18)
Polyphosphates are used as water softening agents because
A)
form soluble complexes anionic species done
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B)
precipitate anionic species done
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C)
from soluble complexes with cationic species done
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D)
precipitate cationic species done
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question_answer19)
When electric current is passed through an hydride in the molten state,
A)
hydrogen is liberated at the cathode done
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B)
hydrogen is liberated at anode done
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C)
hydride ion migrates towards cathode done
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D)
no reaction takes place done
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question_answer20)
Bosch method for the manufacture of hydrogen gas uses
A)
reaction of red hot coke with steam done
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B)
reaction of red hot iron followed by reduction of \[F{{e}_{3}}{{O}_{4}}\]with syn gas done
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C)
coal gasification followed by water-gas shift reaction done
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D)
steam reforming process done
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question_answer21)
Hardness of water is 200 ppm. The normality of \[CaC{{O}_{3}}\]in the water is in the form\[y\times {{10}^{-3}}\]. Identify y.
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question_answer22)
Washing soda (\[N{{a}_{2}}C{{o}_{3}}.10{{H}_{2}}O\]) is widely used in softening of hard water. If 1L of hard water requires 0.0143 g of washing soda. What is hardness of water in terms of ppm of\[CaC{{O}_{3}}\]?
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question_answer23)
Find volume strength of 1.6 \[N\,{{H}_{2}}{{O}_{2}}\] solution.
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question_answer24)
Half litre each of three samples of \[{{H}_{2}}{{O}_{2}}\]labelled 10 vol, 15 vol, 20 vol are mixed and then diluted with 1700 ml of water. Calculate relative strength of resultant \[{{H}_{2}}{{O}_{2}}\]solution.
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question_answer25)
A given solution of \[{{H}_{2}}{{O}_{2}}\]is 30 volumes. Its concentration in terms of molarity is
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