UP PGT Chemistry Mock Test - 1 - UPTET MCQ

Atomic no 24 is of Cr. Due to half filled orbital stability it doesnot follow Afbau rule so its configuration is 

E1 Reactions involve carbocation intermediates which has characteristics of rearrangement into more stable carbocation, hence involves more than one transition states (usually).

various oxides of sulphur, nitrogen, carbon, halogens causes Tropospheric pollution

The number of optically active isomers = 2ⁿ⁻¹−2^{n−1/2 ​}=2³⁻¹−2^3−1/2 ​=2.

This is known as shielding effect. Inner lying electrons shields the positive charge reaching the outer most electrons.

∆H_Vap = 30kJ/mol and ∆S = 75 J/K
∆G = ∆H - T∆S
At eqm, ∆G = 0
Therefore, ∆H = T∆S
Or T = 30×10³/75 = 400 K

The correct answer is Option D.
Electrophoresis movement of colloidal particles towards an electrode, when they are subjected to an electrical field.

Acidic strength of carboxylic acid -

–  More acidic than phenols or alcohols.

–  Acidity increase with the presence of a group with  -I effect in the alkyl group.Whereas it decreases with the presence of  +I group.

–  Acidity increases with increase in the number of halogen atoms on  - position.

–  It decreases with increasing distance of halogen from   

–  It increases with increase in the electronegativity of halogen.

- CF₃COOH > CCl₃COOH > HCOOH > CH₃ COOH

because of presence of lp of electron on head of oxygen atom the bond angle in water deviates from standard bond angle of 109.8⁰ . bond angle in water is 104.5⁰

For 10 degree rise in temperature, n = 1

so rate = 2ⁿ = 2¹ = 2

When temperature is increased from 10 deg C to 100 deg C change in temperature = 100-10 = 90 deg C i.e n=9 

so, rate = 2⁹ = 512 times.

Sum of number of neutrons and protons represents mass number. Tritium has 1 proton and 2 neutrons. 

The correct answer is option B
First of all, we should number the carbon atoms from right to left for the above molecule. According to IUPAC rule, we have to name the functional groups alphabetically. Hence, bromine which is attached to 3rd carbon is named as 3-bromo, chlorine which is attached to 7th carbon is named as 7-chloro and ethyl group which is also attached to 7th carbon is named as 7-ethyl. 5-(1,1-dimethyethyl) indicates that, 2 methyl groups are attached to the 1st carbon of ethyl group which is attached to the 5th carbon of the given molecule. 5-(2-methylpropyl) indicates that, a methyl group is attached to the 2nd carbon of propyl group which is attached to the 5th carbon of the given molecule. Finally, since the molecule has nine atoms and it is an alkane, the word nonane is added to the IUPAC name.
 

Geometrical Isomers can be Diastereomers or Enantiomers.


Because geometrical isomers are around restricted rotation which can not be rotate or interconvertable.

The correct answer is option D(None of the above)
The given compound is 4-Bromo-3methylheptanal

Soda ash is Na₂CO₃.

On changing temperature, solvent (H₂O) is vaporised or condensed. Thus, volume of solution and solvent changes. Thus, any concentration factor dependent on volume is affected by change in temperature.
(a) Molarity = Mole/Litre (Volume dependent)
(b) Molality = Moles of solute/kg of solvent (weight dependent)
(c) Mole fraction = n_i/n_total(unitless)
(d) Weight fraction = w_i/w_total (unitless)

Bohr Model of atom:

• An atom is made up of three particles: Electrons, neutrons and protons.
• The protons and neutrons are located in a small nucleus at the centre of the atom.
• The electrons revolve rapidly around the nucleus at the centre of the atom.
• There is a limit to the number of electrons that each energy level can hold.
• Each energy level is associated with a fixed amount of energy.
• There is no change in the energy of electrons as long as they keep revolving in the same energy level.

Bohr explained the stability through the concept of revolution of electrons in different energy levels.

The change in the energy of an electron occurs when it jumps from lower to higher energy levels. When it gains energy, it excites from lower to higher and vice versa.
Thus energy is not lost and the atom remains stable.

The correct answer is option D
The statement D is false.
Two sucrose solutions of the same molality prepared in different solvents will have different freezing point depression. This is because the molal depression in freezing point constant K_b​ is different for different solvents.
The freezing point depression = ΔT_f​=K_b​×m
Here, m is the molality of sucrose solution.

Epoxide upon hydrolysis gives anti, vicinal diois.

As the number of moles of reactants and products is the same. Hence, they both will occupy equal volume at the same temperature.
Therefore, the reaction A i.e., H2 (g) +I2 (g) ⇌ 2HI (g) is not affected by change in pressure and volume.

The reaction follows free radical mechanism and alkyl free radical is formed in the propagation step as

Hence, stability of alkyl free radical (3° > 2° > 1°) determine the reactivity.

Ionic hydrides are commonly known as saline hydrides or pseudohalides. These compounds form between hydrogen and the most active metals, especially with the alkali and alkaline-earth metals of group one and two elements.

In this group, the hydrogen acts as the hydride ion (H−). They bond with more electropositive metal atoms. Ionic hydrides are usually binary compounds (i.e., only two elements in the compound) and are also insoluble in solutions. Now I hope you can form your own examples, but common examples are Sodium Hydride (NaH), Lithium hydride (LiH), Potassium hydride (KH) etc.

Elements of group 1, i.e. Li, Na, K, Rb, Cs and Fr, are called alkali metals because they react with water to form alkaline solutions. The pH of solutions usually range between 8-12. 

Due to increase in atomic size, ionisation enthalpy decreases down the group.

Mg₃(P0₄)₂ → 3Mg
→2 P
→ 8 mole oxygen
8 mole of oxygen - 1 mole Mg₃ (P0)₂
0.25 - ? 0.25/8 = 3 x 10^-2

The number of monohalogenation products obtained from any alkane depends upon the number of different types of hydrogen it contains. Compound containing one type of hydrogen gives only one monohalogen product.

Out of the options, neopentane has only one type of hydrogen.