HPSC PGT Chemistry Mock Test - 10 - HPSC TGT/PGT MCQ

The correct answer is Sun.

Key Points

• Renewable source of energy:
  • Renewable energy is useful energy that is collected from renewable resources, which are naturally replenished on a human timescale, including carbon-neutral sources like sunlight, wind, rain, tides, waves, and geothermal heat.
  • This type of energy source stands in contrast to fossil fuels, which are being used far more quickly than they are being replenished.
  • Although most renewable energy is sustainable energy, some are not, for example, some biomass is unsustainable.
  • Renewable energy often provides energy in four important areas: electricity generation, air, and water heating/cooling, transportation, and rural (off-grid) energy services.
• Renewable energy flows involve natural phenomena such as sunlight, wind, tides, plant growth, and geothermal heat, as the International Energy Agency explains.
• Renewable energy is derived from natural processes that are replenished constantly.
• In its various forms, it derives directly from the sun, or from heat generated deep within the earth.
• Included in the definition is electricity and heat generated from solar, wind, ocean, hydropower, biomass, geothermal resources, and biofuels, and hydrogen derived from renewable resources.
• Rapid deployment of renewable energy and energy efficiency, and technological diversification of energy sources, would result in significant energy security and economic benefits.
• It would also reduce environmental pollution such as air pollution caused by the burning of fossil fuels and improve public health, reduce premature mortalities due to pollution and save associated health costs that amount to several hundred billion dollars annually only in the United States.
• Renewable energy sources, that derive their energy from the sun, either directly or indirectly, such as hydro and wind, are expected to be capable of supplying humanity energy for almost another 1 billion years, at which point the predicted increase in heat from the Sun is expected to make the surface of the Earth too hot for liquid water to exist.

The correct answer is Phag dance.

Key Points

• The Phag or Phalgun dance is performed by the agricultural folks of Haryana in the months of February- March.
• This dance celebrates the harvest of the farmers and is essentially an expression of joy and bliss.
• The men sport the most colourful and best of their turbans during the performance, while the women wear colourful traditional costumes.
• The dance is performed in the Dhamal style of Haryana.
• There are different songs for the male and the female performers.

Additional Information

•  Loor Dance 
  • Loor dance is one of the popular traditional folk dances of the northern Indian state of Haryana.
  • It is a medium for the local people to express joy and sorrow.
  • It is performed during the month of 'Phalguna' which corresponds to February of the Gregorian calendar.
  • The dance is also performed during the festival of Holi.
• Khodia Dance
  • It is a variant of the Jhumar dance and is exclusively performed by women.
  • This dance is very popular in certain parts of central Haryana.
  • The dancers wear gleaming gold-work skirts and colourful chunries.
  • One of the dancers begins by singing a folk song and is followed by the rest of the dancers to form a circular arrangement.

The correct answer is December.

Key Points

• Pinjore heritage festival is celebrated in Haryana in the last week of December. 
  • The festival celebrates the vibrant and rich culture of Haryana.
  • Many art forms are performed by the poet, singers, and dancers in this festival.
  • It is an annual event of Haryana that focuses on the history and heritage of Pinjore town.
  • Pinjore gardens are also known as Yadavindra Gardens.
  • The gardens resemble the Mughal garden architectural style.
  • Sikh rulers of the Patiala dynasty had renovated this garden.
  • The garden was built by Fadai Khan.

For this question, we will use the given table-

The relation of NZ : MA  is given below-

Similarly,

We will apply the same relation to TV : ? as-

Hence, Option (3) is correct.

Heating limestone at a temperature of 1070K we get quick lime i.e CaO.

CaCO₃ ⇌ CaO (s) + CO₂ (s)

Additional Information: Calcium oxide can be produced by the thermal decomposition of materials like limestone or seashells that contain calcium carbonate in a lime kiln.

KCl.MgCl₂.6H₂O is double salt

XeF₂ molecular geometry is linear. It acquires such shape as the lone pairs present around the central atom tend to take up equatorial positions. The bond angle is said to be 180°.

Alkaline earth metals have valency +2. So on reaction with halogen, they form compounds MX₂.

Oxidation number increases, oxygen gained and loss of electrons is oxidation.

Preparation of Hydrogen from H₂O with Ca (Calcium)

• Hydrogen can be prepared from water (H₂O) through a chemical reaction with calcium (Ca).
• In this reaction, calcium acts as a reducing agent. This is because calcium has the ability to donate electrons during the reaction, which reduces the other reactant, in this case, water.
• The overall chemical reaction that occurs is: Ca + 2H₂O → Ca(OH)₂ + H₂
• In this reaction, calcium (Ca) reacts with water (H₂O) to form calcium hydroxide (Ca(OH)₂) and hydrogen gas (H₂).
• The hydrogen gas that is produced can be collected and used for various purposes.
• Thus, out of the given options, it is calcium that can act as a reducing agent to prepare hydrogen from water.

Why Other Options are Incorrect

• Ag (Silver) and Au (Gold) are noble metals and do not readily participate in chemical reactions. They cannot act as reducing agents to produce hydrogen from water.
• Al (Aluminium) can act as a reducing agent, but it does not react with water under normal conditions to produce hydrogen.

Conclusion

• Therefore, the correct answer is option B: 'Ca, which acts as reducing agent'.

BeO is amphoteric as it can react with both acids and base
BeO₊₂NaOH = Na₂BeO₂
BeO+H₂SO₄ + BeSO₄ + H₂O
On the other hand, MgO and Cao are metallic oxides and act as a base only.

The correct answer is option A
For the reaction rate of disappearance of A is related to rate of appearance of B by the expression:

The process of conversion of primary aromatic amines into its diazonium salt is called diazotization. Diazonium salts are important synthetic intermediates that can undergo coupling reactions to form azo dyes and electrophilic substitution reactions to introduce functional groups.

Since the reaction is not reversible, equilibrium constant is zero.

Here all compounds except in option c are achiral. So automatically option c is correct.

The correct answer is  Option A.
The concentration of the reactant decreases from 0.8M to 0.4M in 15 minutes, i.e. t_1/2 = 15 minutes. Therefore, the concentration of the reactant will fall from 0.1M to 0.025M in two half lives. i.e.    2t_1/2 = 2 × 15 = 30 minutes.

Requirement of macronutrient per acre of the land is 5 to 200 kg

Structure (a) = structure (c) and, structure (b) = structure (d)

For C₃H₈ : 3C + 4H₂ → C₃H₈ ; ∆H₁
For C₃H₈ : 2C + 3H₂ → C₂H₆ ; ∆H₂
∆H₁ = -[2(C-C)+8(C-H)]+[3C_s→g+4(H-H)]     -(I)
∆H₂ = -[1(C-C)+6(C-H)]+[2C_s→g+3(H-H)]     -(2)
Let bond energy of C-C be x kcal and bond energy of C-H be y  kcal.
From eqn I and 2
 ∆H₁ = -[2x+8y]+[3×172+4×104]     -(3)
∆H₂ = -[x+6y]+[2×172+3×104]     -(4)
Also given, C+O₂ → CO₂; ∆H = -94.0 kcal     -(5)
H₂ + ½ O2 → H₂O ; ∆H = -68.0 kcal      -(6)
C₂H₆ + 7/2 O₂ → 2CO₂ + 3H₂O ; ∆H = -372 kcal     -(7)
C₃H₈ + 5O₂  → 3CO₂ + 4H₂O ; ∆H = -530 kcal-(8)
By inspection method,2 × (5) + 3 × (6) - (7) gives
2C + 3H₂ → C₂H₆ ; ∆H₂ = -20 kcal
And  3×(5) + 4×(6) -(8)
3C + 4H₂ → C₃H₈ ; ∆H₃ = -20 kcal 
By eqn. (3), (4), (9) and (10)
x+6y = 676
2x+8y = 956
x = 82 kcal and y = 99 kcal

In elimination reaction of alkyl halide major product is obtained according to Saytzeff’s rule, which states that when two alkenes may be formed, the alkene which is most substituted one predominates.

4 aromatic isomers are possible.

CH3S^-(I) is strongest nucleophile and C6H5O^-(IV) is weakest due to resonance stabilisation in it.

a) More molar mass, more entropy. So ∆_SN2O4 > ∆S_NO2
b) CO₂ has more entropy than dry ice at -78°C
c) Pure alumina iss crystalline solid while ruby is amorphous. And ∆S_amorphous > ∆S_Crystalline. So alumina has less entropy than ruby.
d) At lower pressure, entropy be higher as gas particles are far from each other. So (∆S_N2)1 _bar > (∆S_N2)_{5 bar} 
 

The chemical name of bleaching powder is calcium hypochlorite.it is manufactured by the action of chlorine on slaked lime (Ca(OH).
2Ca(OH)₂+ 2Cl₂→CaOCl₂+ 2H₂O+CaCl₂

Conc KMnO₄ will cause oxidation and ring opening forming adipic acid.

We know that with increase in pressure on one side, reaction shifts to that side which has less no. of moles(of gaseous species). However the no. of moles are same on both sides. So the REACTION WILL REMAIN IN EQUILIBRIUM.

Conjugate acid of a base is formed by adding H⁺ to it
NH₂^- + H⁺ → NH₃