Stoichiometry - Section 1

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Stoichiometry - Section 1

In this section, you will find the problem and MCQs related to this field and
you can solve them easily without any problem.

1.

The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol X_M satisfies

A.	XM < 0.5
B.	XM = 0.5
C.	0.5 < XM < 0.64
D.	XM ≥ 0.64

Answer: Option D

Explanation:

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2.

On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes

A.	1
B.	8
C.	4
D.	2

Answer: Option C

Explanation:

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3.

Pick out the wrong statement.

A.	Heat capacity of a diatomic gas is higher than that of a monoatomic gas.
B.	Equal volumes of Argon and Krypton contain equal number of atoms.
C.	Total number of molecules contained in 22.4 litres of hydrogen at NTP is 6.023 x 1023.
D.	The binary mixture of a particular com-positidn in both vapor and liquid state is known as an azeotropic mixture

Answer: Option B

Explanation:

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4.

1 kgf/cm² is not equal to

A.	1 torr
B.	1 bar
C.	10000 mm wc
D.	100 KPa = 100 000 N/m2

Answer: Option A

Explanation:

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5.

Heat of solution in a system in which both solute and solvent are liquids is termed as

A.	heat of solvation.
B.	heat of hydration.
C.	standard integral heat of solution.
D.	heat of mixing.

Answer: Option D

Explanation:

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6.

Which of the following is an exothermic reaction ?

A.	Conversion of graphite to diamond
B.	Decomposition of water
C.	Dehydrogenation of ethane to ethylene
D.	none of these

Answer: Option D

Explanation:

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7.

In case of an unsaturated vapor-gas mixture, the humid volume increases with increase in the

A.	total pressure.
B.	absolute humidity at a given temperature.
C.	both (a) and (b).
D.	neither (a) nor (b).

Answer: Option C

Explanation:

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8.

Osmotic pressure of a dilute solution of a non volatile solute in a solvent obeying Raoult's law is proportional to the

A.	temperature.
B.	volume of solution.
C.	moles of non-volatile solute.
D.	none of these.

Answer: Option A

Explanation:

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