Copper sulphate solution reacts with sodium hydroxide solution to form a precipitate of copper hydroxide according to the equation: 2 NaOH + CuSO 4 → Na 2 SO 4 + Cu ( OH ) 2 ↓ i) What mass of copper hydroxide is precipitated by using 200 gm of sodium hydroxide? [ H = 1 , O = 16 , Na = 23 , S = 32 , Cu = 64 ] (ii) What is the colour of the precipitate formed?

(i) 2 NaOH + CuSO 4 → Na 2 SO 4 + Cu ( OH ) 2 ↓ Molecular mass of sodium hydroxide = 2 ( 23 + 16 + 1 ) = 80 g Molecular mass of copper hydroxide = 64 + 32 + 2 = 98 g 98 g of Cu ( OH ) 2 is precipitated by using 80 g of NaOH . x g of Cu ( OH ) 2 is precipitated by using 200 g of NaOH . x = 98 80 × 200 g = 245 g of Cu ( OH ) 2 (ii) A light blue precipitate of copper hydroxide will be formed.

HARD

Earn 100

Calculate the relative molecular mass of nitrogen dioxide $[{NO}_{2}]$ .

[Atomic weight of nitrogen = 14; Atomic weight of oxygen = 16].

Important Questions on The Language of Chemistry

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

A and B react to produce C according to the following chemical equation
$2 A + B \to 2 C$

A, B and C are the formulas for three gaseous substances. The vapour densities of A and B are 32 and 16 respectively. Find out the vapour density of C.

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

The unit of atomic mass,

amu

is replaced by

u

, here

u

stands for

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

Calculate the weight of

10^{22}

atoms of carbon. [

C = 12

, Avogadro’s No.=

6 \times 10^{23}

]

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

Which symbol replaced the unit of atomic mass, amu?

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

The molecular mass of methane $({CH}_{4})$ is $16 u$ .

What is the mass of 1 GMM of CH4

MEDIUM

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

Copper sulphate solution reacts with sodium hydroxide solution to form a precipitate of copper hydroxide according to the equation:

$2 NaOH + {CuSO}_{4} \to {Na}_{2} {SO}_{4} + Cu {(OH)}_{2} ↓$

i) What mass of copper hydroxide is precipitated by using $200 gm$ of sodium hydroxide?

$[H = 1, O = 16, Na = 23, S = 32, Cu = 64]$

(ii) What is the colour of the precipitate formed?

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

Calculate mass of

3.01 \times 10^{24}

atoms of an element having atomic mass

21.13

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

In Victor Mayer's method

0.2 gm

of an organic substance displaced

56 ml

of air at STP the molecular weight of the compound

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

Tabulate the difference between gram-molecular mass and relative molecular mass.

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

How many H-atoms are present in

0.046 g

of ethanol

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

116 m g

of a compound on vaporisation in a Victor Meyer's apparatus displaces

44.8 m l

of air measured at S.T.P. The molecular weight of the compounds is

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

Cost of sugar

(C_{12} H_{22} O_{11})

is ₹ 50 per kg. Calculate its cost per mol.

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

What do you understand by the term gram molecular mass?

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

0.228 g

of silver salt of dibasic acid gave a residue of

0.162 g

of silver on ignition, then molecular weight of the acid is

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

Relative molecular mass has the unit of g mol^-1.

HARD

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

A plant virus was examined by the electron microscope and was found to consist of uniform cylindrical particles

150 Å

in diameter and

5000 Å

long. The virus has a specific volume of

0.75 c m^{3} / g

. Assuming virus particles as one molecule, calculate molecular weight of virus.

MEDIUM

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

Number of atoms of oxygen present in 10.6 g of

{N a}_{2} {C O}_{3}

will be

HARD

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

A given sample of xenon fluoride contains molecules of a single type XeF_n (n is a whole number) if

9 \cdot 03 \times 1 0^{20}

molecules has a mass of 0.311 g. Find the value of n

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

The vapour density of a mixture containing

N O_{2}

and

N_{2} O_{4}

38.3 at 300 K

. The number of moles of

N O_{2}

100 g

of the mixture is approximately

EASY

Science>Chemistry>The Language of Chemistry>Relative Atomic Mass, Relative Molecular Mass and Mole Concept

A gas has a vapour density 11.2. The volume occupied by 1g of the gas at NTP is

Calculate the relative molecular mass of nitrogen dioxide NO2. [Atomic weight of nitrogen = 14; Atomic weight of oxygen = 16].

Important Questions on The Language of Chemistry

Learn and Prepare for any exam you want !

Calculate the relative molecular mass of nitrogen dioxide $[{NO}_{2}]$ .

[Atomic weight of nitrogen = 14; Atomic weight of oxygen = 16].