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Some basic concepts OF Chemistry

189 Questions Start Errorless Test
All Exams Errorless
Kerala CET 2000 Q126 Errorless Critical Thinking MCQ
In a mole of water vapour at STP, the volume actually occupied or taken by the molecules (i.e., Avogadro's No. Ɨ Volume of one molecule) is
A.
Zero
B.
Less than 1% of 22.4 litres
C.
About 10% of the volume of container
D.
1% to 2% of 22.4 litres
E.
Between 2% to 5% of 22.4 litres
Kerala MEE 2000 Q127 Errorless Critical Thinking MCQ
Complete combustion of 0.858 g of compound X gives 2.63 g of $CO_{2}$ and 1.28 g of $H_{2}O$ . The lowest molecular mass X can have
A.
43 g
B.
86 g
C.
129 g
D.
172 g
AIIMS 1999; BHU 2005 Q128 Errorless Chemical Stoichiometry MCQ
The equivalent weight of phosphoric acid $(H_{3}PO_{4})$ in the reaction, $NaOH + H_{3}PO_{4} \rightarrow NaH_{2}PO_{4} + H_{2}O$ is
A.
25
B.
49
C.
59
D.
98
IIT 1999 Q129 Errorless Critical Thinking MCQ
The normality of $0.3M$ phosphorous acid $(H_{3}PO_{3})$ is
A.
0.1
B.
0.9
C.
0.3
D.
0.6
IIT JEE 1999 Q130 Errorless Critical Thinking MCQ
One mole of calcium phosphide on reaction with excess of water gives
A.
1 mole of phosphine
B.
2 moles of phosphoric acid
C.
2 moles of phosphine
D.
1 mole of phosphorus pentaoxide
AIIMS 1997 Q131 Errorless The Mole Concept MCQ
The maximum amount of $BaSO_{4}$ precipitated on mixing equal volumes of $BaCl_{2}(0.5\ M)$ with $H_{2}SO_{4}(1M)$ will correspond to
A.
0.5 M
B.
1.0 M
C.
1.5 M
D.
2.0 M
MP PET 1997, 98 Q132 Errorless Chemical Stoichiometry MCQ
One mole of potassium dichromate completely oxidises the following number of moles of ferrous sulphate in acidic medium
A.
1
B.
3
C.
5
D.
6
CBSE PMT 1995 Q133 Errorless Matter and Units for Measurement MCQ
Dimensions of pressure are same as that of
A.
Energy
B.
Force
C.
Energy per unit volume
D.
Force per unit volume
Bihar CEE 1995 Q134 Errorless Atomic, Molecular and Equivalent Masses MCQ
The mass of a molecule of water is
A.
$3 \times 10^{-26}$ kg
B.
$3 \times 10^{-25}$ kg
C.
$1.5 \times 10^{-26}$ kg
D.
$2.5 \times 10^{-26}$ kg
Haryana CEET 1994; DPMT 2004 Q135 Errorless Matter and Units for Measurement MCQ
One fermi is
A.
$10^{-13}$ cm
B.
$10^{-15}$ cm
C.
$10^{-10}$ cm
D.
$10^{-12}$ cm
Roorkee (IIT) 1994 Q136 Errorless Critical Thinking MCQ
The simplest formula of a compound containing 50% of element X (atomic mass 10) and 50% of element Y (atomic mass 20) is
A.
XY
B.
$X_{2}Y$
C.
$XY_{3}$
D.
$X_{2}Y_{3}$
BHU 1993 Q137 Errorless Atomic, Molecular and Equivalent Masses MCQ
The number of molecules in 8.96 L of a gas at $0^{\circ}C$ and 1 atmosphere pressure is approximately
A.
$6.02 \times 10^{23}$
B.
$12.04 \times 10^{23}$
C.
$18.06 \times 10^{23}$
D.
$24.08 \times 10^{22}$
MP PET 1993 Q138 Errorless Atomic, Molecular and Equivalent Masses MCQ
M is the molecular weight of $KMnO_{4}$ . The equivalent weight of $KMnO_{4}$ when it is converted into $K_{2}MnO_{4}$ is
A.
M
B.
M/3
C.
M/5
D.
M/7
BHU 1992 Q139 Errorless The Mole Concept MCQ
The number of moles of sodium oxide in 620g of it is
A.
1 mol
B.
10 moles
C.
18 moles
D.
100 moles
1992 Q140 Errorless The Mole Concept MCQ
80 g of oxygen contains as many atoms as in (BHU 1992; KCET 2008)
A.
10 g of hydrogen
B.
5 g of hydrogen
C.
80 g of hydrogen
D.
1 g of hydrogen
CPMT 1992 Q141 Errorless The Mole Concept MCQ
The total number of gm-molecules of $SO_{2}Cl_{2}$ in 13.5g of sulphuryl chloride is
A.
0.1
B.
0.2
C.
0.3
D.
0.4
CPMT 1992 Q142 Errorless The Mole Concept MCQ
The molarity of orthophosphoric acid having purity of 70% by weight and specific gravity 1.54 would be
A.
11 M
B.
22 M
C.
33 M
D.
44 M
IIT JEE 1992 Q143 Errorless Critical Thinking MCQ
The law of multiple proportions was proposed by
A.
Lavoisier
B.
Dalton
C.
Proust
D.
Gay-Lussac
EAMCET 1991 Q144 Errorless The Mole Concept MCQ
The numbers of moles of $BaCO_{3}$ which contain 1.5 moles of oxygen atoms is
A.
0.5
B.
1
C.
3
D.
$6.02 \times 10^{23}$
IIT JEE 1991 Q145 Errorless Critical Thinking MCQ
The sulphate of a metal M contains 9.87% of M. This sulphate is isomorphous with $ZnSO_{4}.7H_{2}O$ . The atomic weight of M is
A.
40.3
B.
36.3
C.
24.3
D.
11.3
IIT JEE 1991 Q146 Errorless Critical Thinking Numerical
The weight of $1 \times 10^{22}$ molecules of $CuSO_{4}.5H_{2}O$ is [a] 41.59 g (b) 415.9 g (c) 4.159 g (d) None of these
CBSE PMT 1990 Q147 Errorless The Mole Concept MCQ
The number of oxygen atoms in 4.4 g of $CO_{2}$ is approx
A.
$1.2 \times 10^{23}$
B.
$6 \times 10^{22}$
C.
$6 \times 10^{23}$
D.
$12 \times 10^{23}$
EAMCET 1990 Q148 Errorless The Mole Concept MCQ
The number of water molecules in 1 litre of water is
A.
18
B.
$18 \times 1000$
C.
$N_{A}$
D.
$55.55 N_{A}$
AFMC 1989 Q149 Errorless Matter and Units for Measurement MCQ
A mixture of $ZnCl_{2}$ and $PbCl_{2}$ can be separated by
A.
Distillation
B.
Crystallization
C.
Sublimation
D.
Adding aceitic acid
CPMT 1988 Q150 Errorless Atomic, Molecular and Equivalent Masses MCQ
When potassium permanganate is titrated against ferrous ammonium sulphate, the equivalent weight of potassium permanganate is
A.
Molecular weight /10
B.
Molecular weight /5
C.
Molecular weight /2
D.
Molecular weight