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Some basic concepts OF Chemistry

189 Questions Start Errorless Test
All Exams Errorless
Pb. PMT 2004 Q101 Errorless Atomic, Molecular and Equivalent Masses MCQ
The molecular weight of a gas is 45. Its density at STP is
A.
22.4
B.
11.2
C.
5.7
D.
2.0
BHU 2004 Q102 Errorless The Mole Concept MCQ
The number of sodium atoms in 2 moles of sodium ferrocyanide is
A.
$12 \times 10^{23}$
B.
$26 \times 10^{23}$
C.
$34 \times 10^{23}$
D.
$48 \times 10^{23}$
Kerala PMT 2004 Q103 Errorless The Mole Concept MCQ
A sample of phosphorus trichloride ( $PCl_{3}$ ) contains 1.4 moles of the substance. How many atoms are there in the sample
A.
4
B.
5.6
C.
$8.431 \times 10^{23}$
D.
$3.372 \times 10^{24}$
Pb. PMT 2004; CBSE PMT 2008 Q104 Errorless The Mole Concept MCQ
Volume occupied by one molecule of water (density = $1gcm^{-3}$ ) is
A.
$3.0 \times 10^{-23} cm^{3}$
B.
$5.5 \times 10^{-23} cm^{3}$
C.
$9.0 \times 10^{-23} cm^{3}$
D.
$6.023 \times 10^{-23} cm$
Pb. PMT 2004 Q105 Errorless Chemical Stoichiometry MCQ
$Ca(OH)_{2} + H_{3}PO_{4} \rightarrow CaHPO_{4} + 2H_{2}O$ the equivalent weight of $H_{3}PO_{4}$ in the above reaction is
A.
21
B.
27
C.
38
D.
49
UPSEAT 2004 Q106 Errorless Chemical Stoichiometry MCQ
The mass of $BaCO_{3}$ produced when excess $CO_{2}$ is bubbled through a solution of 0.205 mol $Ba(OH)_{2}$ is
A.
81 g
B.
40.5 g
C.
20.25 g
D.
162 g
IIT Screening 2004 Q107 Errorless Critical Thinking MCQ
The product of oxidation of $I^{-}$ with $MnO_4^-$ in alkaline medium is
A.
$IO_3^-$
B.
$I_2$
C.
$IO^-$
D.
$IO_4^-$
MH CET 2003; KCET 2009; KCET (Med.) 2012 Q108 Errorless Atomic, Molecular and Equivalent Masses MCQ
A bivalent metal has an equivalent mass of 32. The molecular mass of the metal nitrate is
A.
168
B.
192
C.
188
D.
182
Pb. CET 2003; BHU 2006 Q109 Errorless Chemical Stoichiometry MCQ
2.76 g of silver carbonate on being strongly heated yield a residue weighing
A.
2.16 g
B.
2.48 g
C.
2.64 g
D.
2.32 g
CBSE PMT 2003 Q110 Errorless Critical Thinking MCQ
The molar heat capacity of water at constant pressure is 75 $JK^{-1} mol^{-1}$ . When $1.0\mathrm{kJ}$ of heat is supplied to $100\mathrm{g}$ of water which is free to expand, the increases in temperature of water is
A.
$6.6\mathrm{K}$
B.
$1.2\mathrm{K}$
C.
$2.4\mathrm{K}$
D.
$4.8\mathrm{K}$
AIEEE 2003 Q111 Errorless Critical Thinking MCQ
What volume of Hydrogen gas, at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by Hydrogen
A.
22.4 L
B.
89.6 L
C.
67.2 L
D.
44.8 L
IIT Screening 2003 Q112 Errorless Critical Thinking MCQ
When $MnO_{2}$ is fused with KOH, a coloured compound is formed the product and its colour is
A.
$K_{2}MnO_{4}$ , purple green
B.
$KMnO_{4}$ , purple
C.
$Mn_{2}O_{3}$ , brown
D.
$Mn_{3}O_{4}$ , black
Kerala MEE 2002 Q113 Errorless Matter and Units for Measurement MCQ
The prefix $10^{18}$ is
A.
Giga
B.
Nano
C.
Mega
D.
Exa
Kerala CET 2002 Q114 Errorless Matter and Units for Measurement MCQ
A mixture of sand and iodine can be separated by
A.
Crystallisation
B.
Sublimation
C.
Distillation
D.
Fractional distillation
MP PET 2002 Q115 Errorless Chemical Stoichiometry MCQ
In order to prepare one litre normal solution of $KMnO_4$ , how many grams of $KMnO_4$ are required if the solution is used in acidic medium for oxidation
A.
158 g
B.
31.6 g
C.
790 g
D.
62 g
AIIMS 2002 Q116 Errorless Critical Thinking MCQ
A compound possesses 8% sulphur by mass. The least molecular mass is
A.
200
B.
400
C.
155
D.
355
IIT 2002 Q117 Errorless Critical Thinking MCQ
How many moles of electron weigh one kilogram
A.
$6.023 \times 10^{23}$
B.
$\frac{1}{9.108} \times 10^{31}$
C.
$\frac{6.023}{9.108} \times 10^{54}$
D.
$\frac{1}{9.108 \times 6.023} \times 10^{8}$
CBSE PMT 2001 Q118 Errorless The Mole Concept MCQ
Molarity of liquid HCl with density equal to 1.17g/cc is
A.
36.5
B.
18.25
C.
32.05
D.
4.65
KCET 2001 Q119 Errorless Chemical Stoichiometry MCQ
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
B.
36 g
C.
48 g
D.
24 g
Kerala CET 2001 Q120 Errorless Critical Thinking MCQ
The set of numerical coefficient that balances the equation $K_{2}CrO_{4} + HCl \rightarrow K_{2}Cr_{2}O_{7} + KCl + H_{2}O$ is
A.
1, 1, 2, 2, 1
B.
2, 2, 1, 1, 1
C.
2, 1, 1, 2, 1
D.
2, 2, 1, 2, 1
Kerala CET 2001 Q121 Errorless Critical Thinking MCQ
Mixture of sand and sulphur may best be separated by
A.
Fractional crystallisation from aqueous solution
B.
Magnetic method
C.
Fractional distillation
D.
Dissolving in $CS_{2}$ and filtering
IIT 2001 Q122 Errorless Critical Thinking MCQ
An aqueous solution of 6.3 g oxalic acid dihydrate is made up to 250 ml. The volume of 0.1 N NaOH required to completely neutralize 10 ml. of this solution is
A.
40 ml.
B.
20 ml.
C.
10 ml.
D.
4 ml.
CBSE PMT 2000 Q123 Errorless Atomic, Molecular and Equivalent Masses MCQ
Assuming fully decomposed, the volume of $CO_{2}$ released at STP on heating 9.85g of $BaCO_{3}$ (Atomic mass of Ba = 137) will be
A.
0.84 L
B.
2.24 L
C.
4.06 L
D.
1.12 L
Kerala MEE 2000 Q124 Errorless Atomic, Molecular and Equivalent Masses MCQ
The number of equivalents of $Na_{2}S_{2}O_{3}$ required for the volumetric estimation of one equivalent of $Cu^{2+}$ is
A.
1
B.
2
C.
3/2
D.
3
CBSE PMT 2000; DCE 2007 Q125 Errorless Chemical Stoichiometry MCQ
A compound contains atoms of three elements in $A, B$ and $C$ . If the oxidation number of $A$ is $+2$ , $B$ is $+5$ and that of $C$ is $-2$ , the possible formula of the compound is
A.
$A_{3}(BC_{4})_{2}$
B.
$A_{3}(B_{4}C)_{2}$
C.
$ABC_{2}$
D.
$A_{2}(BC_{3})_{2}$