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Chemistry
List of top Chemistry Questions
The decomposition of dimethyl ether leads to the formation of
$CH_{4},H_{2}$
and
$\text{CO}$
and the reaction rate is given by
$rate=k\left[C H_{3} O C H_{3}\right]^{\frac{3}{2}}$
The rate of reaction is followed by increase in pressure in a closed vessel, so the rate can also be expressed in terms of the partial pressure of dimethyl ether i.e.
$rate=k\left(P_{C H_{3} O C H_{3}}\right)^{\frac{3}{2}}$
, If the pressure is measured in bar and time in minutes, then the unit of rate constants is:
Chemistry
Chemical Kinetics
For a reaction $3A \to 2B$, rate of reaction $\frac{+d[B]}{dt}$ is equal to
Chemistry
Chemical Kinetics
$0.1$
mole of a carbohydrate with empirical formula
$CH_2O$
contains
$1\, g$
of hydrogen. What is its molecular formula ?
Chemistry
Some basic concepts of chemistry
0.126 g of acid required 20 mL of 0.1 N NaOH for complete neutralisation. The equivalent mass of an acid is
Chemistry
Some basic concepts of chemistry
How many grams of sulphuric acid is to be dissolved to prepare
$200 \,mL$
aqueous solution having concentration of
$[H_{3}O^{+}]$
ions
$1 \,M$
at
$25^{\circ}C$
temperature?
Chemistry
Some basic concepts of chemistry
1.2 g of Mg (At. mass 24) will produce MgO equal to
Chemistry
Some basic concepts of chemistry
$1 \,g$
of
$Mg$
is burnt in a closed vessel containing
$0.5\, g$
of
$O_2$
. Which reactant is limiting reagent and how much of the excess reactant will be left?
Chemistry
Some basic concepts of chemistry
$10\, g$
of hydrogen and
$64\, g$
of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be
Chemistry
Some basic concepts of chemistry
100 mL of
$PH_3$
on decomposition produced phosphorus and hydrogen. The change in volume is
Chemistry
Some basic concepts of chemistry
100 tons of
$Fe_2O_3$
containing 20% impurities will give iron by reduction with
$H_2$
equal to
Chemistry
Some basic concepts of chemistry
$112.0\, mL$
of
$NO_2$
at
$STP$
was liquefied, the density of the liquid being
$1.15\, g \,mL^{-1}$
. Calculate the volume and the number of molecules in the liquid
$NO_2.$
Chemistry
Some basic concepts of chemistry
$18.72\, g$
of a substance
$'X'$
occupies
$1.81 \,cm^3$
. What will be its density measured in correct significant figures?
Chemistry
Some basic concepts of chemistry
$20\, cc$
of
$CO_2$
are passed over red hot coke. The volume of CO evolved is
Chemistry
Some basic concepts of chemistry
$20\, ml$
of
$N/10 \,HCl$
,
$30\, ml $
of
$N/15 \,HNO_{3}$
and
$40\, ml$
of
$N H_{2}SO_{4}$
are mixed. What will be normality of the resulting solution ?
Chemistry
Some basic concepts of chemistry
An organic compound contains
$52.2\%\, C$
and
$13.04\%\, H$
. Vapour density of the compound is
$23$
. Its molecular formula will be
Chemistry
Some basic concepts of chemistry
$2H_2 + O_2 \to 2H_2O$
$2\,g H_2$
and
$1\,O_2$
react to form
$H_2O$
Chemistry
Some basic concepts of chemistry
$4.28 \,g$
of
$NaOH$
is dissolved in water and the solution is made to
$250 \,cc$
. What will be the molarity of the solution?
Chemistry
Some basic concepts of chemistry
$4\cdot48$
litre of methane at
$S.T.P.$
corresponds to
Chemistry
Some basic concepts of chemistry
$4.88\, g$
of
$KClO_{3}$
when heated produced
$1.92 \,g$
of
$O_{2}$
and
$2.96 \,g$
of
$KCl$
. Which of the following statements regarding the experiment is correct?
Chemistry
Some basic concepts of chemistry
$44g$
of a sample on complete combustion gives
$88$
$gm$
$CO_2$
and
$36$
$gm$
of
$H_2O$
. The molecular formula of the compound may be:
Chemistry
Some basic concepts of chemistry
5.6 L of a gas at S.T.P. weighs equal to 8 g. The vapour density of gas is
Chemistry
Some basic concepts of chemistry
$50.0\, kg$
of
$N_{2(g)}$
and
$10.0\, kg$
of
$H_{2(g)}$
are mixed to produce
$NH_{3(g)}$
. Identify the limiting reagent in the production of
$NH_3$
in this situation.
Chemistry
Some basic concepts of chemistry
$50 \,mL$
of an aqueous solution of glucose contains $6.02 \times 10^{22}$ molecules. The concentration of solution is
Chemistry
Some basic concepts of chemistry
A
$400\, mg$
iron capsule contains
$100\, mg$
of ferrous fumarate,
$(CHCOO)_2Fe$
. The percentage of iron present in it, is approximately
Chemistry
Some basic concepts of chemistry
A certain amount of metal, whose equivalent mass is
$28$
, displaces
$0.7\, L$
of
$H_2$
at STP from an acid. Mass of the element is
Chemistry
Some basic concepts of chemistry
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