Tags Chemistry

Chemistry

Get insights from 6.9k questions on Chemistry, answered by students, alumni, and experts. You may also ask and answer any question you like about Chemistry

Follow Ask Question

6.9k

Questions

Discussions

Active Users

Followers

New answer posted

8 months ago

Chemistry Class 12th

(a) CoCl₃.4NH₃, (b) CoCl₃.5NH₃, (c) CoCl₃. 6NH₃ and (d) CoCl(NO₃)₂. 5NH₃.

Number of complex(es) which will exist in cis-trans form is /are__________.

0 Follower 18 Views

alok kumar singh

Contributor-Level 10

(a) $C o C l_{3} . 4 N H_{3} i s [C o C l_{2} {(N H_{3})}_{4}] C l$ will show cis- trans isomerism as;

(b) $C o C l_{3} . 5 N H_{3} i s [C o {(N H_{3})}_{5} C l] C l_{2}$ will not show cis- trans isomerism.

(c) $C o C l_{3} . 6 N H_{3} i s [C o {(N H_{3})}_{6}] C l_{3}$ will not show cis- trans isomerism.

(d) $C o C l {(N O_{3})}_{2} . 5 N H_{3} i s [C o {(N H_{3})}_{6} C l] {(N O_{3})}_{2}$ will not show cis-trans isomerism.

0 0

New answer posted

8 months ago

Chemistry Chemical Kinetics

${[F e {(C N)}_{6}]}^{4 -}$

${[F e {(C N)}_{6}]}^{3 -}$

${[T i {(C N)}_{6}]}^{3 -}$

${[N i {(C N)}_{4}]}^{2 -}$

${[C o {(C N)}_{6}]}^{3 -}$

Among the given complexes, number of paramagnetic complexes in__________.

0 Follower 3 Views

alok kumar singh

Contributor-Level 10

CN is a strong field ligand, so pairing occurs.

1. ${[F e {(C N)}_{6}]}^{4 -}$

So; it is diamagnetic

2. ${[F e {(C N)}_{6}]}^{3 -}$

So; it is paramagnetic.

3. ${[T i {(C N)}_{6}]}^{3 -}$

Ti³⁺ = 4s⁰3d¹

It is paramagnetic

4. ${[N i {(C N)}_{4}]}^{2 -}$

It is diamagnetic

5. ${[C o {(C n)}_{6}]}^{3 -}$

Hence, ${[F e {(C N)}_{6}]}^{3 -} a n d {[T i {(C N)}_{6}]}^{3 -}$ ${_{}}^{} {_{}}^{}$ are paramagnetic.

0 0

New answer posted

8 months ago

Chemistry Class 12th

A radioactive element has a half life of 200 days. The percentage of original activity remaining after 83 days is___________. (Nearest integer)

(Given : antilog 0.125 = 1.333, antilog 0.693 = 4.93)

0 Follower 6 Views

alok kumar singh

Contributor-Level 10

$t_{1 / 2} = 200 d a y s = \frac{0.693}{k}$

$t = \frac{2.303}{k} l o g_{10} \frac{N_{0}}{N}$

83 = $\frac{2.303}{0.693} * 200 l o g \frac{N_{0}}{N}$

$83 = \frac{200}{0.3010} l o g \frac{N_{0}}{N}$

0.125 = $l o g \frac{N_{0}}{N}$

$\frac{N_{0}}{N} = a n t i l o g (0.125)$

= 1.333

Activating remaining = $\frac{N}{N_{0}} * 100$

$= \frac{\frac{N_{0}}{1.333}}{N_{0}} * 100$

= 75%

0 0

New answer posted

8 months ago

Chemistry Class 11th

2.5g protein containing only glycine (C₂H₅NO₂) is dissolved in water to make 500 mL of solution. TH osmotic pressure of this solution at 300 K is found to be 5.03 * 10^-3 bar. The total number of glycine units present in the protein is___________.

(Given : R = 0.083 L bar K^-1 mol^-1)

0 Follower 3 Views

alok kumar singh

Contributor-Level 10

$π = \frac{n}{v} R T$

$π = \frac{W}{M * v} R T$

$5.03 * 1 0^{- 3} = \frac{2.5}{M * 0.5} * 0.083 * 300$

$M = \frac{2.5 * 0.083 * 300}{5.03 * 0.5} * 1 0^{3} g / m o l$

Molar mass of protein, M = 24751 g/mol

Molar mass of glycine = 75 g/mol

So; number of glycine units = $\frac{24751}{75} = 330$

0 0

New answer posted

8 months ago

Chemistry Class 12th

For the given reactions

Sn²+ 2e^- ® Sn

Sn⁴ + 4e^- ® Sn

The electrode potentials are ; $E_{S n^{2 +} / S n}^{o}$ = -0.140V and $E_{S n^{4 +} / S n}^{o} = 0.010 V .$ The magnitude of standard electrode potential for Sn⁴⁺ / Sn²⁺ i.e. $E_{S n^{4 +} / S n^{2 +}}^{o}$ is ___________ * 10^-2 V. (Nearest integer)

0 Follower 12 Views

alok kumar singh

Contributor-Level 10

$E_{S n^{2 +} / S n}^{0} = - 0.140 V = E_{2}^{0}$

$E_{S n^{4 +} / S n}^{0} = + 0.010 V = E_{3}^{0}$

Here, $Δ G_{3}^{0} = Δ G_{1}^{0} + Δ G_{2}^{0}$

$- 4 F E_{3}^{0} = - 2 F E_{1}^{0} - 2 F E_{2}^{0}$

$E_{3}^{0} = \frac{E_{1}^{0} + E_{2}^{0}}{2}$

$+ 0.010 = \frac{E_{1}^{0} + (- 0.140)}{2}$

$E_{1}^{0} = E_{S n^{4 +} / S n^{2 +}}^{0} = + 0.16$

= 16 * 10^-2 V

0 0

New answer posted

8 months ago

Chemistry Class 11th

For combustion of one mole of magnesium in an open container at 300 K and1 bar pressure, $Δ_{C} H^{Θ} = - 601.70 k J m o l^{- 1},$ the magnitude of change in internal energy for the reaction is__________ kJ. (Nearest integer)

0 Follower 3 Views

alok kumar singh

Contributor-Level 10

For combustion of Mg:

Mg (s) + $\frac{1}{2} O_{2} (g) \to M g O (s)$

Here, $Δ n g = - \frac{1}{2}$

Now using

$Δ H = Δ U + Δ n g R T$

-601.7 = $Δ U + (- \frac{1}{2}) * 8.3 * 1 0^{- 3} * 300$

$Δ U = - 600.45 k J$

So; magnitude of $Δ U$ is 600 kJ (the nearest integer).

0 0

New answer posted

8 months ago

Chemistry Chemistry Some Basic Concepts of Chemistry

100g of an ideal gas is kept in a cylinder of 146 L volume at 27°C under 1.5 bar pressure. The molar mass of the gas is _________g mol^-1. (Nearest integer)

(Given : R = 0.083 L bar K^-1 mol^-1)

0 Follower 3 Views

alok kumar singh

Contributor-Level 10

Using : PV = nRT

1.5 * 416 = n * 0.083 * 300

n = 25mol = $\frac{W}{M}$

25 = $\frac{100}{M}$

So, molar mass, M = 4 g/mol.

0 0

New answer posted

8 months ago

Chemistry Chemistry Electrochemistry

The drug tegamet is:

0 Follower 1 View

alok kumar singh

Contributor-Level 10

0 0

New answer posted

8 months ago

Chemistry Class 12th

When sugar 'X' is boiled with dilute H₂SO₄ in alcoholic solution, two isomers 'A' and 'B' are formed. 'A' on oxidation with HNO₃ yields saccharic acid where as 'B' is laevorotatory. The compound 'X' is:

0 Follower 3 Views