KVS PGT Chemistry Mock Test - 3 - KVS PGT/TGT/PRT MCQ

सही उत्तर 'लोक + एषण = लोकएषणा' है।

• दिए गए विकल्पों में असुमेलित 'लोक + एषण = लोकएषणा' है।
• 'लोक + एषणा' का सही सुमेल 'लोकैषणा (अ + ए = ऐ)' होता है।
• यह 'वृद्धि स्वर संधि' का उदाहरण है।
• इसमें अ या आ के बाद ए या ऐ आए तो ‘ऐ’ और ओ और औ आए तो औ हो जाता हो।

अन्य विकल्प-

• मातृ + इच्छा = मात्रिच्छा - यण स्वर संधि
• लघु + उत्तर = लघूत्तर - दीर्घ स्वर संधि
• सु + समा = सुषमा - व्यंजन स्वर संधि

Additional Information

सही उत्तर धर्मार्थ है।

Key Points

• धर्म + अर्थ= धर्मार्थ
• नियम- अ + अ= आ
• धर्मार्थ में "दीर्घ स्वर संधि" है।
• धर्मार्थ शब्द का अर्थ- धर्म हेतु किया गया।
• उदाहरण- सेठजी कोई भी काम धर्मार्थ करते हैं।

Additional Informationसंधि - दो शब्दों के मेल से जो विकार (परिवर्तन) होता है उसे संधि कहतेहैं।
संधि के तीन प्रकार हैं - 1. स्वर, 2. व्यंजन और 3. विसर्ग

The correct answer is The Commission for Agricultural Costs and Prices.

• Based on the recommendations of the Commission for Agricultural Costs and Prices, the Department of Agriculture and Co-operation, Government of India, declares Minimum Support Prices (MSP) for 22 crops before their sowing seasons.

Key Points

• The CACP is an attached office of the Ministry of Agriculture and Farmers Welfare, formed in 1965.
• It is a statutory body that offers separate reports recommending prices for Kharif and Rabi seasons.

Additional Information

• Cost of farming at three levels:
  • A2: All the types of cash expenditure to create the crop like seeds, manure, chemicals, labour costs, fuel costs and irrigation costs.
  • A2+FL: It includes A2 plus an imputed value of unpaid family labour.
  • C2: Under C2, the estimated land rent and the cost of interest on the money taken for farming are added to A2 and FL.
• On 18^th November 2004, the Union government formed the National Commission on Farmers (NCF) with MS Swaminathan as its chairman.
• The main purpose of the committee was to come up with a sustainable farming system, make farm commodities cost-competitive and more profitable.

The correct answer is Six.

Key Points

​Therefore, The United Nation have Six organ body. 

Important Points

• ​The United Nations is an intergovernmental organization.
• The stated purposes are to maintain international peace and security, develop friendly relations among nations, and achieve international cooperation.
• The United Nations (UN) main organs are— the General Assembly, the Security Council, the Economic and Social Council, the Trusteeship Council and the Secretariat, and the International Court of Justice.
  • Founded: 24 October 1945
  • Headquarters: New York, New York, United States
  • Secretary general: António Guterres

The correct answer is Pataliputra.

Key Points

• Pataliputra was the capital of the Mauryan Empire.
• The empire lasted from 321 to 185 BCE.
• The Mauryan Empire was founded by Chandragupta Maurya and the most popular ruler of the empire was Ashoka.
• Mauryan dynasty had three important rulers:
  • Chandragupta
  • Bindusara
  • Ashoka

 Thus, we can say that Pataliputra was the capital of the Mauryan Empire.

Additional Information

• The most important cities of the empire were the capital Pataliputa, Ujjain and Taxila.

The correct answer is Nitrification.

Key Points

• The process of conversion of ammonia into nitrate nitrogen is called nitrification.
• It is done in two steps- Nitrite formation, Nitrate formation.
• Nitrite formation- Ammonia are oxidized to nitrites by Nitrococcus, Nitrosomonas.

Additional Information

• The nitrogen cycle has four steps-
  • Nitrogen Fixation- Conversion of molecular nitrogen into the inorganic nitrogenous compound.
  • Ammonification- Conversion of the dead organic nitrogenous compound into ammonia.
  • Nitrification- Oxidation of ammonia into nitrates.
  • Denitrification- Nitrites or nitrates converts back into molecular nitrogen.

The Internet (or internet) is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to communicate between networks and devices. 

Key Point

The advantage of the internet to a teacher:

1. Access to more information: the internet is a repository of information. A teacher can explore knowledge through using this facility
2. Update knowledge: For a teacher, it is more desirable to deliver updated knowledge. Internet is the only source to get fresh and updated information at a faster rate.
3. Bridge the communication gaps: the internet helps to overcome communication in the classroom and also outside the class
4. Convenience and flexibility: they can adopt different teaching-learning styles and reduce suffering from test anxiety or have difficulty concentrating in a busy classroom.

Important Points

The other advantages of the internet in education are:

• Provide education in remote areas
• Widen the area of knowledge
• Provide a cost-friendly system
• Facilitate more than one course through ODL
• Increase the interest of students in higher education
• Provide free and easily accessible study materials, etc.

Therefore, the advantage of the internet to a teacher is he can update his knowledge and enrich it.

The compounds with each doubly bonded carbon attached to two different groups (like Cab=Cab, Cab=Ccd) exhibit geometrical isomerism i.e., cis and trans forms. The geometrical isomerism arises due to restricted rotation of double bond.

However, even though there is restricted rotation for triple bond, alkynes do not exhibit geometrical isomerism, since the triply bonded carbons are attached to one group each only.

Crystalline compounds are those in which particles/molecules are arranged in proper order as in ice particles/water molecules are arranged in a cage-like ordered manner so this ordered structure is called a crystalline compound.

At anode 2Cl^- —-±>Cl₂+2e^-
At cathode 2Na⁺ +2e^- ——-> 2Na.
So 2 Faraday of electricity is required to liberate 1 mole = 22.4 liters of Cl₂ at STP.
Amount of current passed
= 30 x 60 x 60=108000 coulombs.
So 108000 coulombs will liberate =108000/(96500 x2) = 0.5596 moles Cl₂.
No.of liters of Chlorine liberated at STP
= 0.5596 x 22.4 = 12.53 liters.

Hydrogen peroxide, represented by H₂O₂, is stored in acetanilide or sodium pyrophosphate, the presence of traces of alcohol, which slows down the rate of decomposition of hydrogen peroxide (H₂O₂).

For option a
12 = [Ne]3s2 , 20 = [Ar]4s2 , 4 = [He]2s2 , 88 = [Ra]7s2.
For option b
8 = [He]2s22p4 , 16 = [Ne]3s23p4 , 34 = [Ar]4s23d104p4 , 2 = 1s2
We can see that only in option a, the last electrons enter in similar group. So, option a is correct.
Similarly we can check for option c and d as done above. However they won't fall in the same group.

The correct answer is Option B.

Xe has an electronic configuration of 5s²5p⁶
In XeF², there are two bonding pairs and three lone pairs of electrons. So acc. to VSEPR theory, the structure would be trigonal bipyramidal to avoid electron pair repulsions.(sp³d)
In XeF₄, the structure would be square planar. There are four pairs of bonding electrons and two lone pairs in the molecule. The hybridisation would be sp³d²
XeOF₄ has an octahedral geometry due to sp³d² hybridization. One trans position is occupied by a lone pair giving pyramid shape to the molecule.
Thus  XeF₂ has sp³d hybridization.

• There are a total of 7 periods in the periodic table.
• The sixth period of the periodic table contains 32 elements.
• It is beginning with cesium and ends with radon.
• Lead (Pb) is currently the last stable element whereas all subsequent elements are radioactive.

In electro chemical series (ECS),

thus, Ca²⁺ ion is not reduced to C a instead, H₂O is reduce d to H₂. 

Ag, Cu and Cr are below H in ECS (E°_reduction > 0), thus they are reduced to metals on electrolysis.

Note In ECS, Ca, H, Cr, Cu elements lying above H are better reducing agents thus are easily oxidised.

Ksp = S²
⇒ 6.4 × 10^–5 = S²
⇒ S = 8 × 10^–3 mole/L
S = 8 × 10^–3 × 10³ mole/m³
⇒ S = 8 mole/m³

Tertiary halide would be most reactive in S_N1 reaction.

The reaction of methanol with phenyl magnesium bromide is:

CH₃OH + C₆H₅MgBr → C₆H₆ + Mg(OCH₃)Br

A mixture of benzene and Mg(OMe)Br is obtained.

The correct option is A.

KCI is an ionic compound. Force of attraction (F) between K+


Greater the value of D, smaller the value of F, hence larger the solubility.
Note D for CH₃OCH₃ is least out of given solvents, thus solubility is minimum.

• Partition chromatography because the substances are partitioned or distributed between liquid phases. 
• The two phases are water held in pores of the filter paper and the other phase is a mobile phase that passes through the paper.

Atomic and ionic radii increase down the group due to increasing number of quantum shells.

Atomic size decreases across the period.
Cl has a smaller size than Ar due to the inert nature atoms exist as single atoms.

Glucose solution is one molal. Thus, 1000 g water (solvent) has glucose = one mole = 180 g

Total mass of solution = 1000 +180 = 1180 g

1180 g of solution has glucose = 180 g 

∴ 1000 g of solution has glucose =
180 x 1000/1180 = 152.5 ≈ 153g  

The correct answer is Option B.
The optically active hydrocarbon X is 3-methyl-1-pentene CH₂=CH−CH(CH₃)CH₂CH_3​. On catalytic hydrogenation, it forms 3-methyl pentane CH₃CH₂CH(CH₃)CH₂CH₃, which is optically inactive.

Number of chiral centers = 2

the k is halved while the A is doubled. Hence R remain 50 Ω.

Volume of resulting solution = 100 ml