UP PGT Chemistry Mock Test - 8 - UPTET MCQ

The volume strength of hydrogen peroxide is 11.2 times of molarity, which is mathematically represented by X = 11.2 M; where X is the volume strength of hydrogen peroxide and M is the molarity.

H₃PO₂  is Hypophosphorus acid

The configuration in a compound is independent of its physical properties (optical activity)

2 optical centers.
Total optically active isomers =2²
=4

oxidation state of Ag in tollen’s reagent is +1.

Constant Temperature means isotherm.

Group 15 doping on group 14 element forms n type semiconductor due to excess electrons.

Conductivity is high due to [H⁺]

Ionic reactions occur very fast.

Electron –rich hydrides, as the name suggest, are compounds of hydrogen with other elements that have excess electrons present as lone-pairs. For example ammonia –NH₃ is a hydride of nitrogen that has one lone pair, water (H₂O) is a hydride of oxygen that has two lone pairs etc.

F^- is isoelectronic with Ne  both have 10 electrons

NaHCO₃ + H₂SO₄ →  Na₂SO₄ + H₂O + CO₂
extingusher fire

As per IUPAC nomenclature, the roots are as follows: 0 – nil, 1 – un, 2 – bi, 3 – tri, 4 – quad, 5 – pent, 6 – hex, 7 – sept, 8 – oct and 9 – enn. So the roots for 1, 1 and 9 are un, un, and enn. Hence the symbol of the elements is Uue.

Also, angular momentum is quantised

Dry ice is solid carbon dioxide which is generally used in packing frozen items is an example of molecular solid.

Additional Information: 

• Dry Ice is the common name for solid carbon dioxide (CO2).
• It gets this name because it does not melt into a liquid when heated; instead, it changes directly into a gas (a sublimation process).
• Dry Ice is manufactured by compressing and cooling gaseous CO2 under high pressure to produce liquid CO2 initially.
• Dry ice is a molecular crystal in which the crystal lattice consists of carbon dioxide molecules rather than individual carbon or oxygen atoms.

In oxymercuration-demercuration reaction, Markownikoff's addition of H₂O takes place with HO^- added to carbon where more stable carbocation could be formed.

The correct answer is Option A.

Under mild conditions (temperature ≈ - 80°C) kinetic product is the 1, 2-addition product and under vigorous conditions. (temp. ≈ 40°C) thermodynamic product is the 1 , 4-addition product. Thus, 1-bromo -2 - butene is the major product under given condition.

Rate constant is independent of concentration of reactant.

S_N1 reaction proceeds via carbocation intermediate which is being indicated here by two transition states and a small trough between reactant and product. Also the second transition state must be below first transition state in S_N1 reaction

By Aufbau rule, smaller the value of (n + I), smaller the energy. If (n + I) is same for two or more orbits, suborbit with lower value of n, has smaller energy.

General EC = [Rn] 5f^1-146d^0-17s².

Molar mass = 6(12) + 10(1) + 5(16) = 162g

The correct answer is option B
When conc. of B is doubled, the rate is doubled. 
So, Order w.r.t.  [B] is 1.
The rate increases by a factor of 8 when conc. of [A] and [B] are doubled.
So, Order w.r.t.  [A] is 2.
Overall Rate is 
Rate=k[A]²[B]

Option ‘a’ represents metallic character of Mg. All others remaining represent nonmetals and metalloids.

A diamond is not considered a molecule because each carbon atom is covalently bonded with four other carbon atoms. This is what makes a diamond a network solid.

Additional Information: 

• A network solid or covalent network solid (also called atomic crystalline solids) is a chemical compound (or element) in which the atoms are bonded by covalent bonds in a continuous network extending throughout the material. 
• Examples of network solids include diamond with a continuous network of carbon atoms and silicon dioxide or quartz with a continuous three-dimensional network of SiO₂ units.