Identify the incorrect statement for the reaction 2 H 2 S + SO 2 → 3 S + 2 H 2 O is: (Atomic mass of S = 32 )

Two-thirds of the S produced comes from H 2 S .

1 mol H 2 O is produced per mole of H 2 S consumed.

3 g of S is produced for every gram of SO 2 consumed.

The number of moles of various atoms present before and after the reaction is the same.

MEDIUM

Earn 100

An element X has the following isotopic composition:
${}^{200}X : 90 \frac{o}{o}$ , ${}^{199}X : 8.0 \frac{o}{o}$ , ${}^{202}X : 2 \frac{o}{o}$
The weighted average atomic mass of the naturally occurring element X is close to

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Important Questions on Some Basic Concepts of Chemistry

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

Which solution is isotonic with

6 % w / v

aqueous solution of urea? [Molar mass of Urea

= 60 gm . {mol}^{- 1}

]

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

The common isotopes of carbon are

{}^{12}C

and

{}^{13}C

. The average mass of carbon is

12.01115 amu

. What is the abundance of the

{}^{13}C

isotope?

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

Among the following, the correct statement is:

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

The phenomenon of scattering of light by colloidal particles is called ______.

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

One mole of dioxygen gas at

STP

is equal to

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

Atomic mass of nitrogen is

14 u

. Which of the following sample contain

6.022 \times 10^{23}

nitrogen atoms?

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

Which symbol replaced the unit of atomic mass, amu?

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

Identify the incorrect statement for the reaction $2 H_{2} S + {SO}_{2} \to 3 S + 2 H_{2} O$ is:

(Atomic mass of $S = 32$ )

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

The unit of atomic mass,

amu

is replaced by

u

, here

u

stands for

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

What will be the mass of one atom of

{}^{12}C

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

The visible universe is estimated to contain $10^{22}$ stars. How many moles of stars are present in the visible universe.

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

Natural abundances of

^{12} C

and

^{13} C

isotopes of carbon are

99 %

and

1 %

respectively. Assuming they only contributes to the molecular weight of

C_{2} F_{4}

, the percentage of

C_{2} F_{4}

having a molecular mass of

101

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

The reaction of the burning of carbon in oxygen is represented by equation

$C (s) + O_{2} (g) \overset{}{\to} {CO}_{2} (g) + Heat + Light$

When 9.0 g of solid carbon is burnt in 16.0 g of oxygen gas the mass of carbon dioxide gas formed would be:

(Note: Atomic mass of C-12,o u, O=16.0 u)

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

Dispersed medium + Dispersion medium =

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

One mole of

{SO}_{2}

means

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

The volume occupied by half a mole of a gas at standard temperature and pressure is:

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

Two samples A and B of a pure substance containing elements Y and Z are obtained from two different sources.

5 g

of sample A contains

1.25 g

of Z. Sample B is made of

75 %

of Y by weight. This is an illustration of which of the following laws?

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

Calculate mass of

3.01 \times 10^{24}

atoms of an element having atomic mass

21.13

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

The average molar mass of chlorine is

35.5 g {mol}^{- 1}

. The ratio of

{}^{35}{Cl}

{}^{37}{Cl}

in naturally occurring chlorine is close to :

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Atomic and Molecular Masses

Chlorine has two naturally occurring isotopes.

^{35} C l

and

^{37} C l

. If the atomic mass if

C l

is 35.45, the ratio of natural abundance of

^{35} C l

and

^{37} C l

is closest to

An element X has the following isotopic composition: X200:90 oo , X199:8.0 oo , X202:2 oo The weighted average atomic mass of the naturally occurring element X is close to

Important Questions on Some Basic Concepts of Chemistry

Learn and Prepare for any exam you want !

An element X has the following isotopic composition:
${}^{200}X : 90 \frac{o}{o}$ , ${}^{199}X : 8.0 \frac{o}{o}$ , ${}^{202}X : 2 \frac{o}{o}$
The weighted average atomic mass of the naturally occurring element X is close to