UP PGT Chemistry Mock Test - 4 - UPTET MCQ

The correct answer is Option A.
 
Glucose gets oxidized to cyanohydrin in reaction with HCN . This indicates that the carbonyl group is present as an aldehydic group.

Tb (Z = 65) have [Xe] 4f⁹5d⁰6s² configuration. Tb⁴⁺ have half-filled 4f subshell, i.e. 4f⁷.

The configuration of the first compound is (R,S) and that of the second compound is (S,S). And we know that the isomers which are having different configurations at one or more equivalent chiral centers and the same configuration at the remaining chiral centers are called diastereomers.

[Ni⁰(CO)₄]
[Cr³⁺(NH₃)₂][Ni⁴⁺F₆]₃
[Ni²⁺(NH₃)₂][B⁺³F₄]₂
K₄[Ni⁺²(CN)₆]

The correct answer is option A
Let initial concentration be ao​
After concentration decreases by

Using first order kinetic equation,

The correct answer is Option D.

The catalyst is unchanged chemically at the end of a reaction. During the reaction between the chemical intermediates and the reactants, the catalyst is regenerated.
The catalyst accelerated the reaction. A catalyst is a substance which speeds up a reaction but is chemically unchanged at the end of the reaction.
In a reversible reaction, the catalyst  does not alter the equilibrium position but increases the rate by decreasing activation energy and temperature.
A small amount of catalyst is often sufficient to bring about a large change in reaction. Catalytic action is a chemical reaction between the catalyst and a reactant, forming chemical intermediates that are able to react more readily with each other or with another reactant to form the desired end product.

Down the group Z_eff decrease & complex farmation tendeny decrease

Cl show different oxidation state as -1 to +7 due to vacant d orbital.

As oxygen is more electronegative than Cl.

Oxygen size is small hence its more electronegative and show -2 oxidation states.

2x + 7 (-2) = 0

x = +7

Mg(1s² 2s² 2p⁶3s²) is an electropositive element and Cl(1s² 2s² 2p⁶ 3s² 3p⁵)is an electronegative element.

Mg²⁺ attains stable inert gas configuration.


Cl^- also attains stable inert gas configuration.

Al³⁺ attains stable inert gas configuration. 

O^2- attains stable inert gas configuration.

adsorption is inversely proportional to the temperature. This is true for physical adsorption. In chemical adsorption due to the high energy of activation, the extent of adsorption increases initially and decreases as the temperature increases further.

Cl, O, and N forms Cl₂, O₂ and N₂ respectively to satisfy octet rule but He has noble gas configuration so do not form any compound and exist as monoatomic gas.

this is troposphere

m. equivalent of KOH = 8
m. equivalent of HCOOH = 16
Remaining m. eq. (HCOOH) = 8
Formed m. eq. (HCOOK) = 8
⇒ Acidic Buffer
pH = pKa = 4 – log2
= 3.7
pOH = 10.3

The correct answer is option D
Terylene or Dacron is obtained by the condensation polymerisation of ethylene glycol and terephthalic acid.
It is an example of polyester. The balanced equation is as shown.

It is a simple Tischenko reaction

Oxidation number of Cr changes from +6 to +3.

Number of P – O bonds = 12 
Number of pair of electron = 16 

The Russian scientist Dmitri Mendeleev proposed a periodic table similar to the one we use today in 1869. He arranged the elements according to "periodic law", where element properties could be predicted based on recurring similarities between elements (periodicity).

Dialysis we use, salt solution of approximately same concentration outside the artificial blood capillary, so that urea comes out of the blood, but other useful substances like NaCl , blood cell etc does not. Blood is a colloid.

The correct answer is option A
(I) ^xPO₄³⁻​ ⇒ x + 4 × (−2) = −3
                ⇒x = −3 + 8 = +5
                ⇒x = +5
Oxidation number of P = +5
(II) ^xSO₄²⁻​ ⇒ x + 4 × (−2) = −2
                ⇒x = −2 + 8
                  ⇒x = +6
Oxidation number of S=+6
(III) ^xCr₂​O₇²⁻ ​    ⇒2x + 7 × (−2) = −2
                        ⇒2x =−2+14
                        ⇒2x=12
                        ⇒x= 12/2​ = +6

Peptide bonds are formed by a biochemical reaction that extracts a water molecule as it joins the amino group of one amino acid to the carboxyl group of a neighboring amino acid.

P4 is undergoing oxidation as well as reduction. As oxidation number of P₄ is 0 in reactant and it increases to +1 in H₂PO₂^- and decreases to -3 in PH₃

DNA differs from RNA because DNA has deoxyribose sugar while RNA has ribose sugar. DNA has thymine as pyrimidine while, in RNA thymine is replaced by uracil.So, the correct answer is 'In the nature of sugar and pyrimidines'

By Fajans’ rule, smaller the size of cation, larger the size of anion, larger the charge on cation or anion,
d- and f-electrons present on the ion then greater the polarising power of the ion to polarise the other ion, thus larger the covalent nature.

Thus, com pound with Si⁴+ (smallest cation) and C^4- (largest anion) will be most covalent.