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Some basic concepts OF Chemistry

189 Questions Start Errorless Test
All Exams Errorless
AFMC 1988; DCE 2006 Q151 Errorless Atomic, Molecular and Equivalent Masses MCQ
In acidic medium, equivalent weight of $K_{2}Cr_{2}O_{7}$ (mol. wt.=M) is
A.
M/3
B.
M/4
C.
M/6
D.
M/2
IIT 1988 Q152 Errorless Critical Thinking MCQ
The equivalent weight of $MnSO_{4}$ is half its molecular weight when it is converted to
A.
$Mn_{2}O_{3}$
B.
$MnO_{2}$
C.
$MnO_{4}^{-}$
D.
$MnO_{4}^{2-}$
IIT 1988 Q153 Errorless Critical Thinking MCQ
In which mode of expression, the concentration of a solution remains independent of temperature
A.
Molarity
B.
Normality
C.
Formality
D.
Molality
CPMT 1986 Q154 Errorless Atomic, Molecular and Equivalent Masses MCQ
74.5 g of a metallic chloride contain 35.5 g of chlorine. The equivalent weight of the metal is
A.
19.5
B.
35.5
C.
39.0
D.
78.0
MNR 1986; DUMET 2009 Q155 Errorless Atomic, Molecular and Equivalent Masses MCQ
100 mL of $PH_{3}$ on decomposition produced phosphorus and hydrogen. The change in volume is
A.
50 mL increase
B.
500 mL decrease
C.
900 mL decrease
D.
Nil
EAMCET 1985; Pb. CET 2001 Q156 Errorless Atomic, Molecular and Equivalent Masses MCQ
Sulphur forms the chlorides $S_{2}Cl_{2}$ and $SCl_{2}$ . The equivalent mass of sulphur in $SCl_{2}$ is
A.
$8\mathrm{g / mol}$
B.
$16\mathrm{g / mol}$
C.
$64.8\mathrm{g / mol}$
D.
$32\mathrm{g / mol}$
Pb. PET 1985 Q157 Errorless Atomic, Molecular and Equivalent Masses MCQ
Which of the following has least mass
A.
2 g atom of nitrogen
B.
$3 \times 10^{23}$ atoms of C
C.
1 mole of S
D.
7.0 g of Ag
MNR 1985 Q158 Errorless Chemical Stoichiometry MCQ
12g of Mg (At. mass 24) will react completely with acid to give
A.
One mole of $H_{2}$
B.
1/2 mole of $H_{2}$
C.
2/3 mole of $O_{2}$
D.
Both 1/2 mol of $H_{2}$ and 1/2 mol of $O_{2}$
DPMT 1984; CPMT 2006 Q159 Errorless Atomic, Molecular and Equivalent Masses MCQ
1.520 g of the hydroxide of a metal on ignition gave 0.995 g of oxide. The equivalent weight of metal is
A.
1.520
B.
0.995
C.
19.00
D.
9.00
CPMT 1984 Q160 Errorless Chemical Stoichiometry MCQ
A solution of 10 ml $\frac{M}{10}FeSO_{4}$ was titrated with $KMnO_{4}$ solution in acidic medium. The amount of $KMnO_{4}$ used will be
A.
5 ml of 0.1 M
B.
10 ml of 1.1 M
C.
10 ml of 0.5 M
D.
10 ml of 0.02 M
MNR 1984; UPSEAT 2001 Q161 Errorless Chemical Stoichiometry MCQ
Acidified potassium permanganate solution is decolourised by
A.
Bleaching powder
B.
White vitriol
C.
Mohr's salt
D.
Microcosmic salt
IIT JEE 1983 Q162 Errorless Critical Thinking MCQ
If $10^{21}$ molecules are removed from 200 mg of $CO_{2}$ , then the number of moles of $CO_{2}$ left are
A.
$2.85 \times 10^{-3}$
B.
$28.8 \times 10^{-3}$
C.
$0.288 \times 10^{-3}$
D.
$1.68 \times 10^{-2}$
DPMT 1982 Q163 Errorless Atomic, Molecular and Equivalent Masses MCQ
When 100 ml of 1 M NaOH solution and 10 ml of $10 NH_{2}SO_{4}$ solution are mixed together, the resulting solution will be
A.
Alkaline
B.
Acidic
C.
Strongly acidic
D.
Neutral
IIT JEE 1981 Q164 Errorless Critical Thinking MCQ
One mole of $N_{2}H_{4}$ loses 10 mol of electrons to form a new compound Y. Assuming that all nitrogen appear in the new compound, what is the oxidation state of $N_{2}$ in Y (There is no change in the oxidation state of hydrogen)
A.
+3
B.
-3
C.
-1
D.
+5
IIT 1981 Q165 Errorless Critical Thinking MCQ
If 0.50 mole of $BaCl_2$ is mixed with 0.20 mol of $Na_3PO_4$ , the maximum number of moles of $Ba_3(PO_4)_2$ that can be formed is
A.
0.70
B.
0.50
C.
0.20
D.
0.10
IIT JEE 1980 Q166 Errorless Critical Thinking MCQ
When $P$ reacts with caustic soda, the products are $PH_{3}$ and $NaH_{2}PO_{2}$ . This reaction is an example of
A.
Oxidation
B.
Reduction
C.
Oxidation and reduction (Redox)
D.
Neutralization
Q167 Errorless Matter and Units for Measurement MCQ
Assertion : Atoms can neither be created nor destroyed. Reason : Under similar condition of temperature and pressure, equal volume of gases does not contain equal number of atoms.
A.
If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.
If assertion is true but reason is false.
D.
If the assertion and reason both are false.
E.
If assertion is false but reason is true.
Q168 Errorless Critical Thinking Numerical
In the standardization of $Na_{2}S_{2}O_{3}$ using $K_{2}Cr_{2}O_{7}$ by iodometry, the equivalent weight of $K_{2}Cr_{2}O_{7}$ is [a] (Molecular weight)/2 (b) (Molecular weight)/6 (c) (Molecular weight)/3 (d) Same as molecular weight
Q169 Errorless Critical Thinking MCQ
Mixture X = 0.02 mol of $[Co(NH_{3})_{5}SO_{4}]Br$ and 0.02 mol of $[Co(NH_{3})_{5}Br]SO_{4}$ was prepared in 2 litre of solution 1 litre of mixture X + excess $AgNO_{3} \rightarrow Y$ ; 1 litre of mixture X + excess $BaCl_{2} \rightarrow Z$ . No. of moles of Y and Z are
A.
0.01, 0.01
B.
0.02, 0.01
C.
0.01, 0.02
D.
0.02, 0.02
Q170 Errorless Latest Trend MCQ
Compound A contains 8.7% Hydrogen, 74% Carbon and 17.3% Nitrogen. The molecular formula of the compound is Given: Atomic masses of C,H and N are 12, 1 and 14 amu respectively. The molar mass of the compound A is $162 \, gmol^{-1}$ .
A.
$C_{4}H_{6}N_{2}$
B.
$C_{2}H_{3}N$
C.
$C_{5}H_{7}N$
D.
$C_{10}H_{14}N_{2}$
Q171 Errorless Latest Trend MCQ
Hemoglobin contains 0.34% of iron by mass. The number of Fe atoms in 3.3 g of hemoglobin is (Given: Atomic mass of Fe is $56u, N_{A}$ in $6.022 \times 10^{23} mol^{-1}$ )
A.
$1.21 \times 10^{5}$
B.
$12.0 \times 10^{16}$
C.
$1.21 \times 10^{20}$
D.
$3.4 \times 10^{22}$
Q172 Errorless Latest Trend MCQ
$N_{2(g)} + 3H_{2(g)} \rightleftharpoons 2NH_{3(g)}$ 20 g 5 g Consider the above reaction, the limiting reagent of the reaction and number of moles of $NH_{3}$ formed respectively are
A.
$H_{2}, 1.42$ moles
B.
$H_{2}, 0.71$ moles
C.
$N_{2}, 1.42$ moles
D.
$N_{2}, 0.71$ moles
Q173 Errorless JEE Section MSQ
No reaction occurs in which of the following equations
A.
$I^{\ominus} + Fe^{2+} \longrightarrow$
B.
$F_{2} + 2NaCl \longrightarrow$
C.
$Cl_{2} + 2NaF \longrightarrow$
D.
$I_{2} + 2NaBr \longrightarrow$
Q174 Errorless JEE Section MSQ
0.1 mol of $MnO_{4}^{-}$ (in acidic medium) can
A.
Oxidise 0.5 mol of $Fe^{2+}$
B.
Oxidise 0.166 mol of $FeC_{2}O_{4}$
C.
Oxidise 0.25 mol of $C_{2}O_{4}^{-2}$
D.
Oxidise 0.6 mol of $Cr_{2}O_{7}^{-2}$
Q175 Errorless JEE Section MSQ
When $(NH_{4})_{2}Cr_{2}O_{7}$ is heated
A.
There is oxidation of N
B.
There is reduction of Cr
C.
Net reaction is disproportionation
D.
Net reaction is neutralisation