HPSC PGT Chemistry Mock Test - 5 - HPSC TGT/PGT MCQ

The correct answer is Vitamin C.

Important Points

• Scurvy is a nutritional disorder of humankind.
  • Scurvy is caused by the deficiency of Vitamin C
  • Ascorbic acid is the chemical name of vitamin C.
  • Vitamin C is the first artificially synthesized vitamin.
  • Vitamin C is essential for the healing of wounds, repair, and maintenance of cartilage, bone, and teeth.
  • Vitamin C deteriorated through cooking and canning of food.

Additional Information 

• Xerophthalmia and night blindness are the deficiency diseases of Vitamin A.
• Rickets is the deficiency diseases of Vitamin D.
• Hemorrhage is the deficiency diseases of Vitamin K.

Option 1 is correct, i.e. Anthracite.

• Anthracite, also called hard coal is a highly metamorphosed form of coal.
• The calorific value of a substance is defined as the amount of heat released by a unit weight of a substance during complete combustion.
• Anthracite coal has the highest calorific value.

Anthracite is a type of coal that has the highest carbon content.

• Anthracite: 87-96%
• Bituminous: 45-86%
• Lignite: 25 - 35%

Additional Information

• ​The most common volatile matter in coal is water, carbon dioxide, and sulfur dioxide.
•  Volatile matter is directly related to coal rank; as coal rank increases, volatile matter content decreases.
• Peat has the highest volatile matter.

The first figure is a triangle, then there are 3 line segments inside it.

Similarly,

Circle, then there should be 3 line segments inside it.

The figure is shown below:-

Hence, Option (2) is the correct answer.

NEP 2020 proposes mandatory school attendance for all students until the age of 16 to reduce early dropouts.

NRED in NEP 2020 aims to establish a centralized repository for educational data to aid research and policymaking.

Linguistic Intelligence is associated with the ability of students to use words in a proper way. These students like reading, writing poetry, playing word games, etc. 

The National Education Policy 2020 aims to bring transformational reforms in school and higher education and thus shape India into a global knowledge superpower.

• This policy will usher in sweeping changes to the education policy of the country, including a renaming of the Ministry of Human Resource Development as the Education Ministry.

Key Points

• NEP 2020 is based on the principle that education must develop not only cognitive capacities but also social, ethical, and emotional capacities and dispositions.  
• < />NEP-2020 has given emphasis on conceptual understanding, creativity and critical thinking, human ethical values, and constitutional values.
• < /> It proposes that experiential learning should be encouraged to promote conceptual understanding as experiential learning refers to learning by gaining experience through active involvement. 
• As per National education policy 2020, education must adopt experiential learning including hands-on learning, arts-integrated and sports-integrated education, story-telling-based pedagogy, etc.

Hence, it can be concluded that National Education Policy 2020 states that learning should be experiential.

H+  H⁺ + F^–
pK_w = pK_a + pKb
[For conjugate Acid-Base]
⇒ pK_a = 14 – 10.87 = 3.17
K_a = 6.76 × 10^–4

1L=1000mL so 0.00005L=0.05mL.

If activation energy is high rate of reaction will decrease and reaction will be slow.

75% completion means 2 half lifes so 50% completion means only one half life.

CO(g) + H₂O(g) ⇋  CO₂(g)+H₂(g) ; K₁  --------(i)
CH₄(g)+H₂O(g)  ⇋ CO(g)+3H₂(g) ; K₂  --------(ii)
CH₄(g)+2H₂O(g)  ⇋ CO₂(g)+4H₂(g) ; K₃ ------(iii)
We can see that by adding eqn i and ii, we get eqn iii. So for K, on addition of reaction, the k value gets multiplied.
Therefore, k₃ = k₁k₂

The correct answer is Option C.
A plane of symmetry is an imaginary plane that bisects a molecule into halves that are mirror images of each other.
A molecule has a center of symmetry when, for any atom in the molecule, an identical atom exists diametrically opposite this center an equal distance from it. In other words, a molecule has a center of symmetry when the points (x,y,z) and (−x,−y,−z) correspond to identical objects. For example, if there is an oxygen atom in some point (x,y,z), then there is an oxygen atom in the point (−x,−y,−z). There may or may not be an atom at the inversion center itself. Examples are xenon tetrafluoride where the inversion center is at the Xe atom, and benzene (C6H6) where the inversion center is at the center of the ring.
Optical activity is the ability of a chiral molecule to rotate the plane of plane-polarised light.
 

The correct answer is option D
Xe forms maximum no. of compounds among noble gases. It forms bonds with oxygen and fluorine.

Wolff-Kishner reduction is suitable for reduction of carbonyls containing olefinic bonds. If Clemmensen reduction is done, HCI also attacks olefinic bonds.

In the long form of the periodic table elements are arranged in increasing order of their Atomic number.

Cu (I) undergoes spontaneous disproportionation.

hus, ΔG is negative (spontaneous) for disproportionation.

• Concept of electrons moving in a circular path of fixed energy called orbits was put forward by Bohr and not derived from Rutherford's scattering experiment.
• Out of a large number of circular orbits theoretically possible around the nucleus.
• The electron revolves only in those orbits which have a tired value of energy Hence, these orbits are called energy level or stationary states.

• According to Dobereiner's law of triads each triad contains three elements.
• He also noticed that the middle element of each of the triads had an atomic weight about halfway between the atomic weights of the other two.

Sodium saccharin (benzoic sulfimide) is an artificial sweetener with effectively no food energy. It is about 300–400 times as sweet as sucrose but has a bitter or metallic aftertaste, especially at high concentrations. Saccharin is used to sweeten products such as drinks, candies, cookies, and medicines.

To balance oxidation number, cross-multiply by change in oxidation number

Aloxy mercuration - demercuration brings about Markownikoff’s addition of alcohols at   without any rearrangement.

The correct answer is option A
Nucleotides are joined together by phosphodiester linkage between 5′ and 3′ carbon atoms of pentose sugar.
 

Group 1-Alkali metal,
group2- Alkali earth metals

Let, oxidation number of Fe = x

Langmuir isotherm assume monolayer formation only.

Residence time of methane in the atmosphere is 3 - 7 years

The correct answer is option B
Calcitriol , is the hormonally active metabolite of vitamin D  which has three hydroxyl groups.Calcitriol increases the level of calcium  (Ca2+) in the blood  by increasing the uptake of calcium from the gut  into the blood, increasing reabsorption of calcium by the kidneys, and possibly increasing the release of calcium into the blood from bone. Vitamin D has a significant role in calcium homeostasis  and metabolism. Its discovery was due to effort to find the dietary substance lacking in children with rickets  (the childhood form of osteomalacia).

Energy of ethene =x₁
Number of ethene in benzene=3.
Therefore, Observed energy of hydrogenation of benzene =3x₁
Calculated energy of hydrogenation of benzene =x₂ (Given)
Therefore, 
Resonance energy = observed - calculated =3x₁−x₂

Liquid in liquid sols are emulsions