AWES PGT Chemistry Mock Test - 6 - AWES TGT/PGT MCQ

Multiple means of discrimination is not a part of universal design for learning guidelines.

For ∆H formation we have to look for following:
1. formation of "1 mole" of substance.
2. from "stable" constituting elements.

In first option 1 mole of Co₂ should be formed from C(graphite) for enthalpy of formation to be defined.
In third option 2 moles of NH₃ is formed instead of 1 mole. So incorrect.
In fourth option Co₂ is not formed from constituent elements I.e C(gr) and O2(g) so it is not enthalpy of formation.

Impure metal is made the anode and oxidation takes place

Cu²⁺ formed are reduced at cathode and thus, deposited there.

The correct answer is Option B.
 Lecithin works as an emulsifier which stabilises the emulsion.

Due to delocalisation of π-electrons, (C—Cl) bond is stable and it does not show S_N reactions; Cl directly attached (C=C) bond, i.e. vinyl group.

Equillibrium constant is independent of catalyst. Catalyst doesnot change equilibrium constant.

Although CH₃O^- is weaker base than (CH₃)₃CO^- , former is stronger nucleophile due to smaller size.

Sol.    = 1 p and  = 2 for d.

 Now Cr has configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹

Hence there are 12, p-electrons and 5, d-electrons

We know that white light is composed of many different colours. When white light is allowed to fall on [Ti(H₂O)₆]³⁺ ion, this ion absorbs the light of green and yellow colour and transmits is almost purple colour.The purple colour of the transmitted light is called complimentary colour of that of absorbed light.

Exothermic reaction favourable at low temperature Δn_g < 0
⇒ favourable at high pressure

(c) Experrnent indicates that the applied voltage required is always greater than the voltage calculated from the standard E⁰_ox or E⁰_red. The additional voltage required is called overvoltage. Due to this, Cl₂ and not O₂ s formed. This, (c) 6 correct. 

Volume decreased

i.e p increased

no.of moles reactant more

It is pseudo first order reaction.

There are two types of synthetic resins used for removal of permanent hardness. They are cation exchange resins which are big molecules containing sulfonic acid group and an anion exchange resins which are also big molecules containing amino acids.

This alkaline earth hydride is a colourless solid that is insoluble in solvents that do not decompose it. Unlike the ionically bonded hydrides of the heavier Group 2 elements, beryllium hydride is covalently bonded (three-center two-electron bond).

Hydrogen peroxide has many uses one of the most important uses of hydrogen peroxide is that it acts as a source of power i.e. 90% of hydrogen peroxide is used as fuel and submarines, rockets and helicopters.

Correct option is C. Due to high polarisation power of Li, it takes oxygen atom from going CO₃^2- to form Li₂O. However. The reaction of Na is a general reaction. Rest other GI forms Nitrite on heating of their Nitrate.

Ag⁺ is reduced to Ag by oxygen



Thus, except in (b), oxygen behaves as reducing agent.

We can say that enthalpy of neutralisation of H₂C₂O4 means that we have 2 moles of H⁺. So, for weak acid, enthalpy of neutralisation = heat released in neutralisation of H⁺ and OH^- + enthalpy of ionisation.
∆H_{neutralisation} = 2 (-13.6) + 3.2 = -24.2 kcal mol^-1

Newland's Law of Octaves arranged elements in groups of seven, resembling musical octaves. However, this law did not leave room for the discovery of noble gases, which have very different properties compared to the elements in Newland's groups.

Among the given molecules, N₂ has highest ionization enthalpy.The reason behind is the stability of half-filled orbitals which makes it more stable than other elements in the given option list.

Gadolinium (Gd) have [Xe] 4f⁷5d¹6s² configuration.

BeCl2 has no lone pairs on the beryllium. Thus, the electrons on the chlorides willtry to stay far apart from each other, since their corresponding electrons repel each other (while experiencing no deflection from electrons on a central atom). Thus themolecule is linear in shape.

Dialysis is a process in which colloid is placed inside a bag made of semi permeable membrane like cellophane or parchment paper which permits ions and not colloids to pass through.

By Fajans rule,
Smaller the size of cation, larger the size of anion. Larger the charge on cation or anion, larger the polarising power and thus, greater the covalent nature.

The correct answer is option C
The molar mass M₂​ of non-volatile substance can be calculated from the following formula.

Here, p⁰ vapour pressure of acetone and p is the vapour pressure of the solution.
M_1​ and W₁​ are the molar mass and mass of acetone.
M_2​ and W₂​ are the molar mass and mass of a non-volatile substance.
Substitute values in the above expression.

Hence, M2​=64.38g/mol.
Thus, the molar mass of the non-volatile substance is 64 g/mol (approximately).