HPSC PGT Chemistry Mock Test - 6 - HPSC TGT/PGT MCQ

The correct answer is Ethyl mercaptan.

Key Points

• The stench due to leakage from the LPG cylinder because of Ethyl mercaptan.
  • LPG gas is basically propane and butane.
  • It is odourless in its natural state.
  • The smell that you notice when there is a leak is actually the stench of an entirely different agent, called ethyl mercaptan​.
    • This substance is added to the gas when it leaves the main storage terminals.
• Hence, option 4 is correct.

• Methane :
  • Methane is a chemical compound with the chemical formula CH₄.
  • Methane is a one-carbon compound in which the carbon is attached by single bonds to four hydrogen atoms
  • It is a group-14 hydride and the simplest alkane and is the main constituent of natural gas.
  • It is a colourless, odourless, non-toxic but flammable gas.
  • It has a role as a fossil fuel, a member of greenhouse gas, and a bacterial metabolite.
• Butane :
  • Butane or n-butane is an alkane with the formula C₄H₁₀.
  • Butane is a gas at room temperature and atmospheric pressure.
  • Butane is a highly flammable, colourless, easily liquefied gas that quickly vaporizes at room temperature.
  • Butane is a hydrocarbon and a highly flammable, colourless, odourless, easily liquefied gas.
  • It is typically used as fuel for cigarette lighters and portable stoves, a propellant in aerosols, a heating fuel, a refrigerant.
• Propane :
  • Propane is a three-carbon alkane with the molecular formula C₃H₈.
  • It is a gas at standard temperature and pressure, but compressible to a transportable liquid. 
  • Propane is a flammable hydrocarbon gas that is liquefied through pressurization and commonly used for fuel in heating, cooling, hot water, and vehicles.
  • Propane can also be used for refrigerants, aerosol propellants, and petrochemical feedstock.​ 

The Correct Answer is Option 3 i.e India.

• India:
  • It shares a border with seven countries, namely China, Pakistan, Bhutan, Myanmar, Afghanistan, Nepal, and Bangladesh.
  • India shares the longest border with Bangladesh.
  • It is the largest democracy in the world, the representative with the most number of votes gets the power.
  • New Delhi is the capital of India.
  • Droupadi Murmu is the current President of India and Narendra Modi is the current PM of India.
• Sweden:
  • It is a country in Europe.
  • Sweden is a constitutional monarchy with a parliamentary democracy.
  • Stockholm is the capital of Sweden.
  • Incumbent Magdalena Andersson is the current PM of Sweden.
• Iceland:
  • It is an Island country in Europe.
  • Iceland is a constitutional republic with a multi-party system and is considered as the worlds' oldest parliamentary democracy.
  • Reykjavik is the capital of Iceland.
  • Guoni Thorlacius Johannesson is the current President of Iceland.
• Norway:
  • It is located in Northwestern Europe.
  • It is a constitutional monarchy.
  • Jonas Gahr Støre is the current Prime Minister of Norway.
  • Oslo is the capital city of Norway.

The correct answer is ​Palwal.

• Mahatma Gandhi was arrested on April 10, 1919, when he was going to Punjab against the Rowlatt Act.

Key Points

• Palwal Railway station is 29 km from Faridabad.
• This was the place where Mahatma Gandhi was arrested for the first time.
• In his remembrance, a building called ‘Gandhi Ashram’ is made.
• Palwal is the 21st district of Haryana and Palwal city is the headquarters of this district.

Additional Information

• Palwal got its name from a demon ‘Pulwasur’ who ruled this place during the time of Pandavas.
• He was killed by Balram, the elder brother of Shri Krishna.
• In memory of this incident ‘, the Baldev chat ka Mela festival is organized every year.

The correct answer is the Fatehabad district.

About Fatehabad District:

• The Fatehabad city recognised as the Fatehabad district on 15th July 1997. It was separated from the Hisar district of Haryana state and recognized as the new separate district.
• It is one of the smallest districts in the Haryana State and covers 5.69 % areas of the state. Fatehabad district is surrounded by Sirsa district in the West direction, Punjab state in the North, Jind district in the East, Hisar district, and Rajasthan state in the South. 
• The Geographical area of the Fatehabad district is 2520 km, which is 5.4% of the total state share. Fatehabad is connected by metalled roads with important cities of the Haryana and Delhi state. 
• According to Puranas, the areas of Fatehabad district remained a part of the Nanda Empire. It is situated on the banks of Saraswati and the Drishadvati river.
• The discovery of Ashokan pillars at Fatehabad and Hisar shows that the area of the district remained a part of the Mauryan Empire.

About Humayun Mosque:

• There is a Small Mosque built by him known as the Humayun mosque in the city of Fatehabad. The reason behind the Mosque was built by the 2nd Mughal Emperor Humayun, who in his fight after his defeat at the hands of Sher Shah Suri happened to pass through the city of Fatehabad.

Image of the Humayun Mosque:

1) 8, 4, 3, 7, 1, 5, 2, 6

2) 5, 2, 7, 3, 4, 1, 8, 6

3) 3, 1, 6, 8, 4, 5, 2, 7

4) 1, 4, 8, 3, 2, 5, 7, 6

'POLITICS' is a meaningful English word.

Hence, '1, 4, 8, 3, 2, 5, 7, 6' is the correct answer.

The logic followed here is:

The figure in image 2 is water image of the figure in image 1. The figure in image C of answer figure will be the water image of the figure in image 3.

Hence, image C of answer figure is the correct answer.

Given:

Efficiency of Amit = 2 × Efficiency of Ramit

Concept used:

Total work = Efficiency × Time period

Calculation:

The efficiency of Amit = 2

Efficiency of Ramit = 1

Total work = (2 + 1) × 28 = 3 × 28 = 84

Number of days Ramit takes to complete the whole work = 84/1 = 84

∴ The number of days in Ramit will complete the work is 84 days.

The correct answer is Option B.
 Lecithin works as an emulsifier which stabilises the emulsion.

 (b)

(a) When Si is doped with electron-deficient impurity -(p -type)

(b) When Si is doped with electron-rich impurity-(n-type)

(c) In case of semiconductors, the gap between the valence band and conduction band is small. Some electrons may Jump to conduction band and thus, conduction is observed. Semiconductors of this type are called intrinsic semiconductors.

(d) Insulators are non-conducting with high energy gap.

The correct answer is option A
rate=k[NO]₂[O₂]
As, C = n/V
On making the volume half, concentration doubles and rate of reaction becomes eight times.
 

pH changes from 0 to 7

∴ [H⁺] changes from 1 to 10^-7 M

Accordingly E_red. Decrease by 0.059 log 10^-7 i.e 0.059 x (-7) = -0.41volt

Due to delocalisation of π-electrons, (C—Cl) bond is stable and it does not show S_N reactions; Cl directly attached (C=C) bond, i.e. vinyl group.

Equillibrium constant is independent of catalyst. Catalyst doesnot change equilibrium constant.

The substance which forms the colloidal solution in water is starch. A colloidal solution is a solution in which the colloid mixes uniformly. All colloids have a Tyndall Effect, which is not exhibited by glucose. Starch is a colloid and thus when mixed with water can form the colloidal solution.

Volume decreased

i.e p increased

no.of moles reactant more

• Oxidation Numbers of Halogens: The halogens (Fluorine, Chlorine, Bromine, Iodine, and Astatine) are a group in the periodic table. They are known for their high electronegativity and hence, when they combine with almost all other elements, they tend to have an oxidation number of -1 as they gain one electron to achieve a stable electronic configuration.
• Exception in the case of Oxygen: However, oxygen is more electronegative than all halogens except fluorine. So, when halogens (chlorine, bromine, and iodine) combine with oxygen, they tend to lose electrons to oxygen and hence, they show positive oxidation states.
• Conclusion: Therefore, when chlorine, bromine, and iodine are combined with oxygen, they have an oxidation number of +1 or any positive number (depending on the number of oxygen atoms they are combined with). Hence, the correct answer is C: +1 or any positive number.

Carbon has the highest first ionisation energy because ionisation energy decreases down the group and increases from left to right in a period.

I₂ gets reduce to I⁻ while  H₂O₂ get oxidize to O₂

Valency is defined as the number of electrons in the outermost shell of an element . As the last shell(third shell) has one electron in it the valency of sodium(Na) is 1 or +1 as it looses that electron to form a cation and achieve noble gas configuration.

Sodium has 11 electrons: its atomic number is 11, so it has 11 protons; atoms are neutral, so this means sodium also has 11 electrons.

The correct answer is Option C. 

Noble gases have completely filled the outer shell/valence shell. Due to this reason they are very stable and do not react with other elements. Hence noble gases are called inert gases means they do not react with other elements to form chemical compounds.
 

Fe atom= 560/56 =10 mole
= 10 x N_A atom
option(A) = 5 mol
5 x N_A 
option (B) = 20/1 = 20
20 x N_A

Standard temperature and pressure (STP) is defined as 0 degrees Celsius and 1 atmosphere of pressure. At STP, 1 mole of any gas occupies 22.4 liters.
First, calculate the number of moles of hydrogen gas (H2) in 67.2 liters:
67.2 L / 22.4 L/mole = 3 moles of H2
Each molecule of H2 contains 2 atoms of hydrogen. Therefore, 3 moles of H2 contains:
3 moles * (6.022 x 10^23 molecules/mole) * 2 atoms/molecule = 3.6132 x 10^24 atoms of hydrogen.

The correct answer is Option A.

Total pressure =290 mm
Vapour pressure of propyl alcohol =200 mm
Mole fraction of ethyl alcohol = 0.6
Mol fraction of propyl alcohol =1− 0.6 = 0.4
 
PT = P⁰_A × χ_A + P⁰_B × (1−χ_A)
290 = 200 × 0.4 + P^o_B × 0.6
0.6 × P⁰B = 290 − 80
P⁰B = 350 mm

K₂O + H₂O → KOH

environmental chemistry basically deals with the interrelationship between chemical species generated by human activities or naturally.

We have ∆G = ∆H - T∆S
For spontaneous reaction ∆G<0 and vice versa,
∆G at 80° C:-
3213 - (80+273)8.73 = 141.9 kJ mol-1
As it comes positive, the conversion of rhombic and monoclinic is non- spontaneous at 80° C.In other words, rhombic is more stable than monoclinic at this temperature.
∆G at 110° C:-
3213 - (110+273)8.73 = -119.1 kJ mol-1
As it comes positive, the conversion of rhombic and monoclinic is spontaneous at 110° C.In other words, rhombic is less stable than monoclinic at this temperature.

Rate constant is also known as velocity constant.

The electronic configuration of the Hydrogen atom is 1s1.

It has one electron in the outermost shell. It exists as a diatomic molecule (H2​) by sharing its' electron with other hydrogen atom.

It cannot form ionic compounds because it cannot donate its' electron and can only form covalent compounds by sharing the electron. It cannot lose an electron to form a cation because the hydrogen atom cannot exist after losing an electron.