EMRS PGT Chemistry Mock Test - 9 - EMRS 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. 

Concept

Size of element:

• The atomic size of an element is determined by the atomic radius of an element.
• Atomic radius is the distance between the center of an atom to its outermost (valence) shell having electrons.
• The atomic size of any element is mentioned in form of Atomic radius.
• Unit of Atomic radius is Amstrong (A^o).

Valency of an element:

• Valency is the combining capacity of an atom of an element.
• It is otherwise the valence electrons an atom uses to form a chemical bond.

The molar mass of the element:

• It is defined as the mass of one atom of an element.
• The unit is g/mol.
• For all substances, the molar mass of in g/mol is numerically equal to the formula mass in atomic mass units.

Explanation:

• The maximum number of univalent atoms that may combine with an atom of the element is the Valency.
• The valency of an element is always an integer.
• With regard to covalent compounds, the term valency describes the number of bonds usually formed by each element.
• In ionic compounds, often, the number of positive or negative charges that appear on the atom in its ion helps to state its valency.
• The chemical behavior is largely influenced by the valency of the element.

Hence, Valency of an element is the property that determines an element's chemical behavior.

The logic followed is:

Abduct and Kidnap are synonyms.

Similarly,

Fierce and Violent are synonyms.

Hence, the correct answer is "Violent".

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".

According to question,
A's weight is twice as much as of B.
1. A = 2B.
B's weight is four and half times as much as of C.
2. B = 4.5C
C's weight is half times as much as of D.
3. C = D/2.
D's weight is half as much as of E.
4. D = E/2.
E weight is less than A but more than C.
5. A > E > C
from 1 and 2
6. A = 2B = 9C
from 6 and 3
7. A = 2B = 9C = 4.5D
from 7 and 4
8. A = 2B = 9C = 4.5D = 2.25E
so from 8 and 5
A > B > E > D > C
E is heavier than D and C.

Ozonolysis breaks the double bond and oxidizes that carbon. To solve these questions, when the reactants are asked, just remove the carbonyl oxygen from the products and join the resulting compounds using a double bond. 

125 mL of 0.05 M AgN0₃ = 125 x 0.05 millimoles 

Electronegativity increases as we move from left to right due to lanthanide contraction.

(a,c)

(a) Vapour pressure of a component in a solution,  by Raoult's law, thus correct.

(b) π = i MRT

For NaBr,

y = 2, / = 1 + (y - 1)x = 2

M = 1, T = (273 + t )

∴  π = 2R (273 + t) thus, incorrect.

(c)

π = i MRT

π  ∝ for equimolar solution

i = 1 for sucrose

i = (1 + x)forCH₃COOH (x < < 1)

for CH₃COOH being weak acid

i = 2 for KCI

i = 3 for K₂S0₄

Thus, π (osmotic pressure) of 0.01 M solutions of sucrose < CH₃COOH < KCI < K₂S0₄ Thus, correct.

 and K₁ are different, hence ΔT_f will be different, thus incorrect.

As mentioned in mechanism, reaction proceed via carbocation intermediate. Hence, alcohol forming most stable carbocation reacts most easily. Alcohol (c) forms aromatic (highly stable) carbocation, hence most reactive.

Formal charge (F)

where, v = valence electrons = 6
s = shared electrons = 4
u = unshared electron = 4

Mendeleev's Periodic Table was initially arranged based on increasing atomic mass. He noticed that elements with similar properties appeared at regular intervals when arranged in order of increasing atomic mass.

In A Ni has +4 oxidation state.

Diazonium reacts with phenols and napthols to form dyes.

Thermite process doesn’t require a catalyst.

The correct answer is Option A.
For first-order reaction, half-life t1/2 = 
Since half-life does not depend on the concentration of reactants.
 
According to the given data, the order of reaction with respect to B is one, hence, does not change half-life.
 
Similarly, an order of reaction with respect to A is also one since the rate increases twice on doubling the concentration.
Hence, total order = 1 + 1 = 2 

Second order reaction and its unit is Lmol⁻¹s⁻¹.

Carbon – 14 is used in determining the age of organic substances

The electronic configuration of carbon in its ground state is given by 1s²2s²2p⁴. When it’s in an excited state, that is when it loses an electron, that would be from 2p-orbital. So the excited state’s electronic configuration is 1s²2s¹2p³.

Due to lanthanide contraction, Ag and Au have nearly same size.

Rule- The object in the active voice becomes the subject in the passive voice and the subject in the active voice becomes the object in the passive voice.This is valid in both ways (Active to passive and vice-versa). Further, the verb is changed to the past participle form. 
Thus, option 1 is correct.

The sentence seems to say that the person in concern was expecting a surprise on his birthday and not accepting it. Expect means to want or wish for something whereas accepting means to receive or recognize some issue.
Thus option 2 is correct.

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.

A realist is a person who analyses every problem on real and factual terms.
Example- The world today requires realist leaders more than anything else.

सही उत्तर मिश्र वाक्य है।

Key Points

• जहाँ गंगा, यमुना बहती है, वह देश उपजाऊ है। मिश्र वाक्य है।
• जिस वाक्य में एक प्रधान उपवाक्य तथा एक या एक से अधिक आश्रित उपवाक्य हों उसे मिश्र वाक्य कहते हैं।
• मिश्र वाक्य के सभी उपवाक्य योजक शब्दों से प्रारंभ हों तो वाक्य का अंतिम उपवाक्य प्रधान उपवाक्य तथा शेष सभी उपवाक्य आश्रित उपवाक्य होंगे।
  • उदाहरण- मेरा दृढ़ विश्वास है कि भारत जीतेगा।
  • सफल वही होता है जो परिश्रम करता है।

Additional Information

सही उत्तर 'मेरा यह सोचना, सही निकला' है।

• मेरा यह सोचना कि लोकेश प्रतिभाशाली छात्र है, सही निकला। इस वाक्य में ‘मेरा यह सोचना’ 'सही निकला' प्रधान उपवाक्य है।
• किसी वाक्य में जो उपवाक्य किसी पर आश्रित नहीं होता अर्थात् स्वतंत्र होता है एवम् उसकी क्रिया मुख्य होती है, वह मुख्य या प्रधान उपवाक्य कहलाता है।
• जैसे – मोदी जी ने कहा कि अच्छे दिन आएँगे।
• इस वाक्य में ‘मोदी जी ने कहा’प्रधान उपवाक्य है।

Key Points

• उपवाक्य: ऐसा पदसमूह, जिसका अपना अर्थ हो, जो एक वाक्य का भाग हो और जिसमें उदेश्य और विधेय हों, उपवाक्य कहलाता हैं।
• उपवाक्यों के आरम्भ में अधिकतर कि, जिससे, ताकि, जो, जितना, ज्यों-त्यों, चूँकि, क्योंकि, यदि, यद्यपि, जब, जहाँ इत्यादि होते हैं।
• उपवाक्य दो तरह के होते हैं – प्रधान उपवाक्य, आश्रित उपवाक्य।
• आश्रित उपवाक्य: दूसरे उपवाक्य पर आश्रित होता है।
• आश्रित उपवाक्य क्योंकि, कि, यदि, जो, आदि से आरंभ होते हैं।
• जैसे –मोदी जी ने कहा कि अच्छे दिन आएँगे।
• इस वाक्य में "कि अच्छे दिन आएँगे।" आश्रित उपवाक्य है क्योंकि यह उपवाक्य "मोदी जी ने कहा" उपवाक्य पर आश्रित है।