11.

You are watching: What is the total number of atoms represented in the formula cuso4 • 5h2o

A particular sample of gas has a volume of 0.2 L measured at 1 a:tm pressure and 0°C. At the exact same push but 273°C, its volume will certainly be :

0.4 L

0.8 L

27.8 L

55.6 L


Given, V1 = 0.2 L ; T1 = 273 K ; T2= 476According to Charles"s Law,

V1T1=V2T20.2273=V2476

Therefore, V2 = 0.4 L. So, the volume will be 0.4 L at the exact same push.


Pollutants which are formed by reaction amongst the main pollutantsare dubbed as second pollutants e.g., peroxyacyl nitprices (PAN) are created via reaction in between nitrogen oxides and also hydrocarbons in the visibility of sunlight.


14.

By which among the complying with compounds bothCH4 and also CH3- CH3 have the right to be ready in one step?

CH3I

CH3OH

CH3CH2I

C2H5OH


By CH3I, both CH4 and also CH3 - CH3 deserve to be prepared in one action. The reaction is as follows:CH3I + 2H→orZn-Cu/C2H5OHZn+HClCH4 + HI

CH3I + 2Na + ICH3→dryetherCH3 - CH3 + 2NaI


15.

When electrons are trapped right into the crystal in anion vacancy, the defect is well-known as :

Schottky defect

Frenkel defect

stoichiometric defect

F-centres


F-centres are the sites wright here anions are absent and rather electrons are existing. They are responsible for colour.


Total variety of atoms existing in compound CuSO4 . 5H2O is 21.1 atom of Copper (Cu) + 1 atom of Sulphur (S) + 4 atom of Oxygen (O) + 10 atoms of Hydrogen (H) + 5 atoms of Oxygen (O)

= 1 + 1 + 4 + 10 + 5

= 21 atoms.


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17.

Which of the adhering to offers correct arrangement of compounds connected based on their bond strength ?

HF > HCl > HBr > HI

HI > HBr > HCl > HF

HF > HBr > HCl > HI

HCl > HF > HBr > HI


Amongst all the given alternatives, choice a gives the correct plan of compounds based on their bond strength-HF > HCl > HBr > HI

This is because, Bond strength∝1sizeofhalogen


18.

R - NH - COH→PyridinePOCl3ProductIn the offered reaction, what will be the product?

R - N = C = O

R -N+≡C-

R - C≡N

Namong these


In the above offered reaction, the product is R -N+≡C-R - NH - COH→PyridinePOCl3R -N+≡C-


19.

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The enthalpy of burning at 25°C of H2, cyclohexane (C6H12) and also cyclohexene (C6H10) are -241, -3920 and also -3800 kJ/mol respectively. The warm of hydrogecountry of cyclohexene is :

-121 kJ/mol

+121 kJ/mol

-242 kJ/mol

+242 kJ/mol


The warm of hydrogecountry of cyclohexene deserve to be calculated as-H2 +12O2→H2O ; ∆H= -241 kJ ...(i)

C6H10 +172O2→6CO2 + 5H2O ;∆H = -3800 kJ ...(ii)

C6H12+ 9O2→6CO2 + 6H2O ;∆H = -3920 kJ ...(iii)

Hydrogecountry of cyclohexane-

C6H10 + H2→C6H12

Equation (i) + equation (ii) - equation (iii)

∆H = -241 - 3800 - (-3920)

= -4041 + 3920

= - 121 kJ


20.

The entropy worths (in JK-1mol-1) of H2(g) = 130.6, Cl2(g) = 223.0 and also HCl (g) = 186. 7 at 298 K and also 1 atm press. Then entropy readjust for the reactivity :H2 (g)+ Cl2(g)→ 2HCl (g) is: