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Some basic concepts OF Chemistry

189 Questions Start Errorless Test
All Exams Errorless
JEE (Main) 2014 Q51 Errorless Critical Thinking MCQ
The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1:4. The ratio of number of their molecule is
A.
1:4
B.
7:32
C.
1:8
D.
3:16
JEE (Main) 2014 Q52 Errorless Critical Thinking MCQ
The equation which is balanced and represents the correct product(s) is
A.
$Li_{2}O + 2KCl \rightarrow 2LiCl + K_{2}O$
B.
$[CoCl(NH_{3})_{5}]^{+} + 5H^{+} \rightarrow Co^{2+} + 5NH_{4}^{+} + Cl^{-}$
C.
$[Mg(H_{2}O)_{6}]^{2+} + (EDTA)^{4-} \xrightarrow{\text{excess NaOH}} [Mg(EDTA)]^{2+} + 6H_{2}O$
D.
$CuSO_{4} + 4KCN \rightarrow K_{2}[Cu(CN)_{4}] + K_{2}SO_{4}$
JEE (Advanced) 2014 Q53 Errorless JEE Section MSQ
For the reaction $I^{-} + ClO_{3}^{-} + H_{2}SO_{4}\longrightarrow Cl^{-} + HSO_{4}^{-} + I_{2}$ The correct statement(s) in the balanced equation is/are
A.
Stoichiometric coefficient of $HSO_4^-$ is 6
B.
Iodide is oxidized
C.
Sulphur is reduced
D.
$H_{2}O$ is one of the products
MP PET 2013 Q54 Errorless The Mole Concept MCQ
Which has maximum number of atoms
A.
$24\mathrm{gms}$ of $C_{(12)}$
B.
$56\mathrm{gms}$ of $Fe_{(56)}$
C.
$27\mathrm{gms}$ of $Al_{(27)}$
D.
$108\mathrm{gms}$ of $Ag_{(108)}$
WB JEE 2013 Q55 Errorless Chemical Stoichiometry MCQ
Number of hydrogen ions present in 10 millionth part of $1.33\mathrm{cm}^3$ of pure water at $25^{\circ}C$ is
A.
6.023 million
B.
60 million
C.
8.01 million
D.
80.23 million
Kerala PMT 2012 Q56 Errorless The Mole Concept MCQ
Which one of the following is the lightest
A.
0.2 mole of hydrogen gas
B.
$6.023 \times 10^{22}$ molecules of nitrogen
C.
0.1 g of silver
D.
0.1 mole of oxygen gas
E.
1 g of water
KCET (Med.) 2012 Q57 Errorless The Mole Concept MCQ
The number of moles of hydrogen that can be added to 1 mole of an oil is the highest in
A.
Linseed oil
B.
Groundnut oil
C.
Sunflower seed oil
D.
Mustard oil
Kerala PET 2012 Q58 Errorless Critical Thinking MCQ
A $100\%$ pure sample of a divalent metal carbonate weighing 2g on complete thermal decomposition releases 448 cc of carbon dioxide at STP. The equivalent mass of the metal is
A.
40
B.
20
C.
28
D.
12
E.
56
IIT JEE 2012 Q59 Errorless JEE Section MCQ
Bleaching powder and bleach solution are produced on a large scale and used in several house hold products. The effectiveness of bleach solution is often measured by iodometry. 25 mL of household bleach solution was mixed with 30 mL of 0.50M KI and 10 mL of 4N acetic acid. In the titration of the liberated iodine, 48 ml of 0.25N $Na_{2}S_{2}O_{3}$ was used to reach the end point. The molarity of the household bleach solution is
A.
$0.48M$
B.
$0.96M$
C.
0.24 M
D.
0.024 M
IIT JEE 2012 Q60 Errorless JEE Section MCQ
Bleaching powder and bleach solution are produced on a large scale and used in several house hold products. The effectiveness of bleach solution is often measured by iodometry. Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is
A.
$Cl_{2}O$
B.
$Cl_{2}O_{7}$
C.
$ClO_{2}$
D.
$Cl_{2}O_{6}$
IIT JEE 2012 Q61 Errorless JEE Section Numerical
29.2% (w/w) HCl stock solution has a density of 1.25 g mL $^{-1}$ . The molecular weight of HCl is 36.5g mol $^{-1}$ . The volume (mL) of stock solution required to prepare a 200mL solution of 0.4M HCl is
Kerala PET 2011 Q62 Errorless Atomic, Molecular and Equivalent Masses MCQ
Arrange the following in the order of increasing mass (atomic mass: O = 16, Cu = 63, N = 14)
(I) One atom of oxygen (II) One atom of nitrogen
(III) $1 \times 10^{-10}$ mole of oxygen (IV) $1 \times 10^{-10}$ mole of copper
A.
II < I < III < IV
B.
I < II < III < IV
C.
III < II < IV < I
D.
IV < II < III < I
E.
II < IV < I < III
MP PET 2011 Q63 Errorless Atomic, Molecular and Equivalent Masses MCQ
If the molecular weight of $H_{3}PO_{3}$ is M, its equivalent weight will be
A.
M
B.
M/2
C.
M/3
D.
2M
CBSE PMT (Mains) 2011 Q64 Errorless The Mole Concept MCQ
Which has the maximum number of molecules among the following
A.
$8gH_{2}$
B.
$64gSO_{2}$
C.
$44gCO_{2}$
D.
$48gO_{3}$
IIT JEE 2011 Q65 Errorless JEE Section Numerical
A decapeptide (Mol. Wt. 796) on complete hydrolysis gives glycine (Mol. Wt. 75), alanine and phenylalanine. Glycine contributes $47.0\%$ to the total weight of the hydrolysed products. The number of glycine units present in the decapeptide is
IIT JEE 2011 Q66 Errorless JEE Section Numerical
Reaction of $Br_{2}$ with: $Na_{2}CO_{3}$ in aqueous solutions gives sodium bromide and sodium bromate with evolution of $CO_{2}$ gas. The number of sodium bromide molecules involved in the balanced chemical equation is
CPMT 2010 Q67 Errorless Atomic, Molecular and Equivalent Masses MCQ
0.75g platinic chloride, a monoacid base on ignition gave 0.245g platinum. The molecular weight of the base is
A.
75.0
B.
93.5
C.
100
D.
80.0
AMU (Engg.) 2010 Q68 Errorless Atomic, Molecular and Equivalent Masses MCQ
0.32g of metal gave on treatment with an acid 112 mL of hydrogen at NTP. Calculate the equivalent weight of the metal
A.
58
B.
32
C.
11.2
D.
24
CBSE PMT (Pre.) 2010 Q69 Errorless The Mole Concept MCQ
The number of atoms in 0.1 mole of a triatomic gas is $(N_{A}=6.02\times10^{23}\ mol^{-1})$
A.
$1.800\times10^{22}$
B.
$6.026\times10^{22}$
C.
$1.806\times10^{23}$
D.
$3.600\times10^{23}$
AFMC 2010 Q70 Errorless The Mole Concept MCQ
In an experiment, 4g of $M_{2}O_{x}$ oxide was reduced to 2.8g of the metal. If the atomic mass of the metal is 56g mol $^{-1}$ , the number of O atoms in the oxide is
A.
1
B.
2
C.
3
D.
4
Kerala PET 2010 Q71 Errorless Critical Thinking MCQ
How much time (in hours) would it take to distribute one Avogadro number of wheat grains if $10^{20}$ grains are distributed each second
A.
0.1673
B.
1.673
C.
16.73
D.
167.3
E.
1673
KCET 2010 Q72 Errorless Critical Thinking MCQ
A mixture of $CaCl_{2}$ and NaCl weighing 4.44g is treated with sodium carbonate solution to precipitate all the $Ca^{2+}$ ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56g of CaO. The percentage of NaCl the mixture (Atomic mass of Ca = 40) is
A.
75
B.
30.5
C.
25
D.
69.4
IIT JEE 2010 Q73 Errorless JEE Section Numerical
A student performs a titration with different burettes and find titre values of 25.2 mL, 25.25 mL, and 25.0 mL. The number of significant figures in the average titre value is
EAMCET 2009 Q74 Errorless Atomic, Molecular and Equivalent Masses MCQ
1.5 g of $CdCl_{2}$ was found to contain 0.9 g of Cd. Calculate the atomic weight of Cd
A.
118
B.
112
C.
106.5
D.
53.25
Odisha JEE 2009 Q75 Errorless The Mole Concept MCQ
100 ml $O_{2}$ and $H_{2}$ kept at same temperature and pressure. What is true about their number of molecules
A.
$N_{O_{2}} > N_{H_{2}}$
B.
$N_{O_{2}} < N_{H_{2}}$
C.
$N_{O_{2}} = N_{H_{2}}$
D.
$N_{O_{2}} + N_{H_{2}} = 1$ mole