EMRS PGT Chemistry Mock Test - 4 - EMRS MCQ

Concept:

• The laws dealing with ideal gases naturally called ideal gas laws, and the laws determined in the seventeenth century by Boyle's observational work and in the eighteenth century by Charles.
• The Boyles Law states that the gas pressure is inversely proportional to the gas volume for a given mass of gas stored at a constant temperature.
• Charles Law states that the gas volume is directly proportional to the gas temperature for a given fixed mass of gas stored at a constant pressure. 
• An ideal gas is a gas that follows the equation:

PV = nRT at all temperatures and pressure, where P = Pressure of the ideal gas. V = Volume of the ideal gas n = Amount of ideal gas measured in terms of moles 

R = Universal gas constant T = Temperature

Mole Concept -

•  The quantity one mole of a substance signifies 6.022 × 10²³ number of particles of that substance which may be atoms, molecules, or ions.
• The quantity is a universal constant like Dozen, Gross, etc., and is known as Avogadro number, denoted by NA. after the scientist Amedeo Avogadro.
• Examples- In one mole of H₂, there are 6.022 × 10²³ molecules of hydrogen, and the number of atoms is 2 × 6.022 × 10²³, as one molecule of hydrogen contains two-atom each.
• The mass of one mole of a substance is called its Molar Mass (M) or Atomic mass expressed in grams.
• The volume occupied by a mole of gas is 22.4 L at NTP, called its Molar Volume.
• The no. of moles (n) is calculated as =

The number of particles / Avogadro’s number.

To summarise, we can say, 

Calculation:

• The molar mass of 1 mole of H₂SO₄ is =

2 × 1 + 32 + 4 × 16 = 98g

• The molar mass of 1 mole of Silver, Ag is its molecular mass 108g.
• The molar mass of CO₂ is = 12 + 2× 16 = 44g.
• 44g of CO₂ means one mole.
• 1 mole of Oxygen weighs 16 + 16 = 32g.
• Hence, the highest mass is of 1 mole of Ag.

Concept:

• Plants have different types of roots.
• Some store food, some breathe some hang from the branches.

Explanation:

• Roots are the underground structures that help in the absorption of water and minerals provide a proper anchorage to the plant parts, storage of reserve food material (Carrot, Radish), and synthesis of PGR (plant growth regulators).
• Sometimes roots get modified to perform different functions like storage of food, respiration, climbing, etc.
• These types of roots are called modified roots.
• Examples - prop root of the Banyan tree for providing support, Pneumatophores of Rhizophora, and Mangrove plants for respiration.

So, these statements are correct.

• To give support to the plant.
• To store food.
• To absorb water and minerals.

Thus, roots do not function to provide humus.

The logic followed is:

The bottom number = sum of the square of all the first three number column-wise 

In column-wise operation:

Column 1:

69 = 7² + 4² + 2² 

69 = 49 + 16 + 4

69 = 69

Column 2:

91 = 32 + 92 + 12 

91 = 9 + 81 + 1

91 = 91

Similarly,

Column 3:

? = 22 + 62 + 52 

? = 4 + 36 + 25

? = 65 

Hence, the correct answer is "65".

Additional Information

The most common pattern asked in exams are based on:

• It could be the sum of two numbers divided by a constant
• It could be the average of numbers.
• It could be in the form of alphabets, where alphabets are increased by constant or increased by the square of numbers or increased by prime numbers.
• It could be the difference of product of two diametrically opposite numbers.
• It could be the difference in the sum of adjacent numbers.
• The difference of the numbers could be in the patterns 13 ± 1, 23 ± 1,  and so on.
• The difference of the numbers could be in the patterns 12 ± 1, 22 ± 1, and so on.
• Numbers could be 12, 22, 32, and so on or 13, 23, 33, and so on.
• The difference could be prime numbers or the difference could be the square of prime numbers.
• The difference could be in the form of N2 ± N or N3 ± N.
• The difference could be in the form of ×N + N or ×2 + 1, ×2 + 2, ×2 + 3, and so on.
• The difference could be in the form of ×2 ± 1 alternatively.
• Numbers could be ×1, ×2, ×3, and so on. 

The total number of triangle is according to figure is 2 + 3 + 3 + 2 + 8 = 18 

There are five such 5's as shown below

3 5 9 5 4 5 5 3 5 8 4 5 6 7 3 5 7 5 5 4 5 2 3 5 1 0

The logic followed here is:

The place value of A is 1, D is 4, O is 15 and U is 21. 

In each of the given figure the alphabet and its place value are given except  U and 23 in figure D.

Hence, figure D is the odd one from the given figures.

Hence, the above image is the correct answer.

Given: Neptune, Planet, Moon

The logic followed here is: Neptune is a Planet, but Moon is not. Moon is a natural satellite.

Hence, option (4)  is the correct answer.

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Among the given options, only jpeg and gif are graphics formats. Jpeg format supports lots of colors and it also compresses static images better than gif.

One of the most important chemical properties of hydrogen peroxide i.e. H₂O₂ is that it is acidic in nature. It is weakly acidic in nature and pure hydrogen peroxide turns blue Litmus red (an indication of acidic nature).

Since the reagent is BaCl₂(aq), displacement reaction will take place. The resulting solution, if insoluble in water, will form a white precipitate. Both BaNO₂ and BaCl₂ are soluble in water and hence will not form a precipitate. BaSO₄, however, is insoluble in water and hence forms a white precipitate.

The configuration of the first compound is (R,S) and that of the second compound is (S,S). And we know that the isomers which are having different configurations at one or more equivalent chiral centers and the same configuration at the remaining chiral centers are called diastereomers.

• In the second and third period of the modern periodic table does not involve any d orbital so we have s and p which have 8 electrons combined.
• So for the second period, we have eight elements and for the third period, we have 8 elements so we have total of 16 elements in all.

Additional Information: 

• The second and third periods contain 8 elements each and are called short periods.
  • The 2nd-period elements: lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon.
  • The 3rd-period elements: sodium, magnesium, aluminum, silicon, phosphorus, sulphur, chlorine, and argon.
• The First period contains 2 elements (Hydrogen, Helium) and is called a very short period. 

m. equivalent of KOH = 8
m. equivalent of HCOOH = 16
Remaining m. eq. (HCOOH) = 8
Formed m. eq. (HCOOK) = 8
⇒ Acidic Buffer
pH = pKa = 4 – log2
= 3.7
pOH = 10.3

)bond enthalpy > )bond enthalpy hence, is stable.

Bond enthalpy of six (P— P) bond = 6 x 215 = 1290 k j mol^-1

Bond enthalpy of six (N — N) bond = 6 x 160
= 960 kJ mol^-1
Thus, P₄ is more stable than N₄.

With strong base C₂H₅ONa, reaction proceeds by E2 mechanism. Since, there is no H in the anti position at tertiary β-carbon, deprotonation occur from secondary β-carbon giving 2-menthene as the major product. On the other hand, with weak base, reaction proceeds by E1 mechanism and the most stable tertiary carbocation formed, gives the major product 3-menthene.

Thus, AS behaves as a non-electrolyte at the freezing point of solution (remains non-ionised).

Tertiary halide would react at fastest rate with AgNO₃ as reaction will proceed by S_N1 mechanism.

Starch and cellulose occur naturally.

Substrate bind to specific site of enzyme known as active site to form a enzyme substrate complex.

'Dyslexia' is a term known for reading disorder. The person having this disorder faces difficulty in learning to read or interpret words, letters, and other symbols, but it is not related to general intelligence. It will not have any impact on a person's general intelligence. It is a hereditary disorder that mostly runs in families. Hence, the correct answer is, 'Reading disorder.'

Both statements are true but the two different products are due to resonance in carbocation intermediate as

The sentence indicates to the extreme hypocrisy of the religious leader, who even after being proven guilty does not want to give away his god-like, self-righteous stature. Hence, the correct answer should be 1 because of 'sanctimoniously' means 'self-righteous'. The other options 'sacrilegious', 'profane', and 'violated' respectively mean blasphemous, non-religious, disobeying the prescribed rules and regulations and corrupt.

Latent represents something that is apparent or superficial and that cannot be easily seen. 
Incensed means enraged, soporific represents something that causes sleep whereas spurn means to refuse. Thus, option 1 is appropriate.
Example- He has a huge reserve of latent talent in him.

To 'bury the hatchet' is to 'end a fight'. Therefore, the correct meaning is 'make peace'.

गुणहीन का समास विग्रह 'गुण से हीन' है। Key Points

• गुणहीन में अपादान तत्पुरुष समास है।
• अपादान तत्पुरुष समास- जिस समास में उत्तर पद प्रधान तथा पूर्व पद गौण हो तथा 'से' विभक्ति का लोप हो अपादान तत्पुरुष समास कहलाता है।
• उदाहरण- भयभीत, देशनिकाला, दूरागत आदि।

Additional Information

• तत्पुरुष समास की परिभाषा- जिस समास का उत्तरपद प्रधान हो तत्पुरुष समास कहलाता है, इस समास में कारक चिह्नों का लोप होता है।
• तत्पुरुष समास के छः भेद होते है

दिए गए विकल्पों में सही उत्तर विकल्प 3 ‘देशाटन’ है। अन्य विकल्प इसके अनुचित उत्तर हैं।

Key Points

• देशाटन का अर्थ होता है:- देश भ्रमण, पर्यटन करना।
• देशाटन का समास विग्रह:-
  • देश में अटन (भ्रमण)।
• अतः देशाटन शब्द तत्पुरुष समास का उदहारण है। क्योंकि यहाँ “का“ विभक्ति का लोप हुआ है। अतः सही उत्तर देशाटन होगा ।

अन्य विकल्प:-

Additional Information

• समास का तात्पर्य है ‘संक्षिप्तीकरण’। हिन्दी व्याकरण में समास का शाब्दिक अर्थ होता है छोटा रूप; जब दो या दो से अधिक शब्दों से मिलकर जो नया और छोटा शब्द बनता है उस शब्द को हिन्दी में समास कहते हैं।
• समास के उदाहरण:-
  • रसोई के लिए घर इसे हम रसोईघर भी कह सकते हैं।
  • राजा का पुत्र’ – राजपुत्र
• समास के निम्नलिखित छह भेद होते हैं—
• अव्ययीभाव समास - यदि एक शब्द की पुनरावृत्ति हो और दोनों शब्द मिलकर अव्यय की तरह प्रयोग हों वहाँ पर अव्ययीभाव समास होता है संस्कृत में उपसर्ग युक्त पद भी अव्ययीभाव समास ही मने जाते हैं।
• उदाहरण:-
  • प्रतिवर्ष =हर वर्ष
  • आजन्म = जन्म से लेकर
• तत्पुरुष समास - इस समास में दूसरा पद प्रधान होता है। यह कारक से जुदा समास होता है। इसमें ज्ञातव्य – विग्रह में जो कारक प्रकट होता है उसी कारक वाला वो समास होता है। इसे बनाने में दो पदों के बीच कारक चिन्हों का लोप हो जाता है उसे तत्पुरुष समास कहते हैं।
• उदाहरण:-
  • देश के लिए भक्ति = देशभक्ति
  • राजा का महल = राजमहल
• कर्मधारय समास - इस समास का उत्तर पद प्रधान होता है। इस समास में विशेषण -विशेष्य और उपमेय -उपमान से मिलकर बनते हैं उसे कर्मधारय समास कहते हैं।
• उदाहरण:-
  • पीताम्बर =पीत है जो अम्बर
  • महात्मा =महान है जो आत्मा
• द्विगु समास - द्विगु समास में पूर्वपद संख्यावाचक होता है और कभी-कभी उत्तरपद भी संख्यावाचक होता हुआ देखा जा सकता है। इस समास में प्रयुक्त संख्या किसी समूह को दर्शाती है किसी अर्थ को नहीं |इससे समूह और समाहार का बोध होता है। उसे द्विगु समास कहते हैं।
• उदाहरण:-
  • नवग्रह = नौ ग्रहों का समूह
  • दोपहर = दो पहरों का समाहार
• द्वन्द समास - इस समास में दोनों पद ही प्रधान होते हैं इसमें किसी भी पद का गौण नहीं होता है। ये दोनों पद एक-दूसरे पद के विलोम होते हैं लेकिन ये हमेशा नहीं होता है। इसका विग्रह करने पर और, अथवा, या, एवं का प्रयोग होता है उसे द्वंद्व समास कहते हैं।
• उदाहरण:-
  • जलवायु = जल और वायु
  • अपना-पराया = अपना या पराया
• बहुव्रीहि समास - इस समास में कोई भी पद प्रधान नहीं होता। जब दो पद मिलकर तीसरा पद बनाते हैं तब वह तीसरा पद प्रधान होता है। इसका विग्रह करने पर “वाला है, जो, जिसका, जिसकी, जिसके, वह” आदि आते हैं वह बहुब्रीहि समास कहलाता है।
• उदाहरण:-
  • गजानन = गज का आनन है जिसका (गणेश)
  • त्रिनेत्र =तीन नेत्र हैं जिसके (शिव)