NVS PGT Chemistry Mock Test - 9 - NVS TGT/PGT MCQ

The correct answer is Ethanol + Methanol​.

• Ethanol + Methanol​ is denatured alcohol.
• Denatured alcohol is ethanol that has additives to make it poisonous, bad-tasting, foul-smelling, or nauseating to discourage its recreational consumption.
• The term denatured alcohol refers to alcohol products adulterated with toxic and/or bad tasting additives (e.g., methanol, benzene, pyridine, castor oil, gasoline, isopropyl alcohol, and acetone), making it unsuitable for human consumption.
• The most common additive used is methanol (5–10%), giving rise to the term methylated spirits. Denatured alcohol is used as a lower-cost solvent or fuel for home-scale or industrial use.

Key Points

• Denatured alcohol is ethanol or grain alcohol that contains additional chemicals called denaturants that make it unfit for human consumption.
• Denatured alcohol is fine for some types of lab work and as an ingredient in certain products, but it's not safe to drink.
• Ethanol is an organic chemical compound. It is simple alcohol with the chemical formula C₂H₆O.
• Its formula can be also written as CH₃−CH₂−OH or C₂H₅OH and is often abbreviated as EtOH.

Additional Information

• Alcohol (ethanol or ethyl alcohol) is the ingredient found in beer, wine, and spirits that causes drunkenness.
• Alcohol is formed when yeast ferments (breaks down without oxygen) the sugars in different food. 

Preparing the family tree using the following symbols:

A possible tree diagram will be:

Praveena’s father’s sister’s mother is the grandmother of Sandhya.

Hence, "Grandmother" is the correct answer.

Venn diagram according to the given information is:

Guava, Mangoes, Fruits

As Mangoes and guava both are fruits, so they will come inside the fruits.

But,

Individually both the guava and mangoes are different fruits so there will be no intersection or shared part, so they will come as a separate circle inside the fruits.

Hence, the correct answer is "Option 4".

Let X and Y be two buses. Bus X travels the PA, AB, BC, CD.
Now, AD = BC = 25 km.
So, PD = PA +AD = 50km.
Bus Y travels 35km upto E.
Distance between two buses = PQ – (PD + QE)
= [150 – (50 + 35)] = 65 km.

The pattern followed is:

Top right number = multiplication of top left number and bottom number 

In fig 1:

729 = 81 × 9

729 = 729

In fig 2:

512 = 64 × 8

512 = 512

Similarly,

In fig 3:

? = 49 × 7

? = 343 

Hence, the correct answer is "343".

Given:

x + y + 1 = 0

Concept Used:

(a + b )³ = a³ + b³ + 3ab (a + b)

Calculations:

x + y + 1 = 0

⇒ x + y = -1

Cubing on both sides we get

(x + y)³ = ( -1 )³

⇒ x³ + y³ + 3xy( x + y ) = -1

⇒ x³ + y³ + 3xy ( -1) = -1

∵ x + y = -1

⇒ x³ + y³ - 3xy = -1

∴ required value = -1

Essay type questions do not provide scope to assess the students objectively. Mrs. Suman is using essay type questions. These questions are subjective in nature and their answers vary from subject to subject; whereas multiple choice questions, true/false type questions, or one word answer type questions are used to assess the students objectively.

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:

(9) n = 3 can have suborbits

Total nine electrons.

KCl.MgCl₂.6H₂O is double salt

 + 4H₂O + 3e^- → Cr(OH)₃ + 5OH^-, E° = - 0.13 V 
+ 14H⁺ + 6e^- → 2Cr³⁺ + 7H₂O , E° = 1.33 V

The correct answer is option A
2-hexyne with Li/NH3​ gives trans-2-hexene. This reaction is also considered as Birch reduction.

Mn²⁺ (d⁵) is more stable than Mn³⁺(d⁴) because Mn²⁺ have half-filled configuration.

For boiling point, we have to consider both branching and Molecular mass. In 4  bromopentane molecular mass is nearly the same as compared to 3 chloro pentane but we have 3,3-dichloropentane extended into 2 directions so the boiling point of 3,3-dichloropentane will be more and the other order will be followed by option C.

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.

Thus, (i) → (p),   (ii) → (r), (iii) → (s), (iv)→(t), (v) → (r)

Solution: the correct option is a

Compound i. have four stereoisomers, have two optically active isomers and have more than two pairs of diastereomers

Compound ii. have only three stereoisomers and have two optically active isomers

Compound iii. have four stereoisomers and have more than two pairs of diastereomers

Compound iv. have four stereoisomers and  have more than two pairs of diastereomers

4 aromatic isomers are possible.

Total order of reaction = order wrt to A + order wrt to B.

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

Also X, has CH₃— CH(OH)—, gives iodoform test and it is chiral.
 

Water has a maximum density at 4-degree centigrade, this is because at 4-degree centigrade, as opposite forces are in balance that is like the formation of Ice and maintaining of the liquid phase of water. Any less than 4-degree centigrade or greater than 4-degree centigrade, the water density is lesser than that of 4-degree centigrade.

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.

"Readiness for learning" refers to the cognitive level of students in the learning continuum. Readiness for learning means how a person seeks out knowledge on their own. This trait in students stimulates maximum achievement. Motivation, inspiration, or the dreams to accomplish a goal helps a lot to achieve this readiness for learning in life.
Hence, the correct answer is, 'Present cognitive level of students in the learning continuum.'

The Ministry of Education released the National Education Policy (NEP) in 2020. The policy aims to adapt India's educational system to the demands of the twenty-first century.

Key PointsAccording to NEP 2020, each subject's curriculum will be pared down to its core essentials, to allow room for critical thinking and more holistic, inquiry-based, discovery-based, discussion-based, and analysis-based learning.

• NEP 2020 provides a reduction in content and increased flexibility in the school curriculum.
• It promotes multilingualism in the classroom.
•  The main focus is here on constructive rather than rote learning and it must be accompanied by parallel changes in school textbooks.
• Classroom sessions will frequently include more enjoyable, creative, and exploratory activities.​
• NEP 2020 places a strong emphasis on using mother tongue, local, or regional languages at least till grade five.

Thus, NEP 2020 does not give emphasis on learning from the material given in the textbooks.

The correct option is Option 1, i.e., ‘The team leader said that his team could win that tournament.’
In the sentence, the reporting verb is the past tense. Hence, the simple present tense changes to simple past tense, i.e., ‘can’ to ‘could’ and ‘this’ to ‘that’. Therefore, the correct option is Option 1.

The given sentence is in the active voice. The correct conversion to passive voice is given in option 2. Options 1 and 4 change the meaning of the given sentence and option 3 gives an incomplete conversion.