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R – X + R¹ONa → R – O – R¹ + NaX

The answer is phenol.

(i) Number of electrons present in 1 molecule of methane (CH₄)
{1(6) + 4(1)} = 10
Number of electrons present in 1 mole i.e., 6.023 × 10²³ molecules of methane

6.022 × 10²³ × 10 = 6.022 × 10²⁴

(i) RCH₂OH \(\overset{1.Alk.KmnO_4}{\underset{2.H_3O^+}{\longrightarrow}}\) RCOOH

(ii) CH₃COONa \(\overset{NaOH.CaO}{\underset{\Delta}{\longrightarrow}}\) CH₄

Mass of one electron = 9.10939 × 10^–31 kg
Mass of one mole of electron = (6.022 × 10²³) × (9.10939 ×10^–31 kg)
= 5.48 × 10^–7 kg
Charge on one electron = 1.6022 × 10^–19 coulomb
Charge on one mole of electron = (1.6022 × 10^–19 C) (6.022 × 10²³)
= 9.65 × 10⁴ C

40% aqueous solution of formaldehyde.

RN₂⁺ X^– R = Aryl group OR ArN/X

The answer is Glycine.

Option : (D) O₂

In O₂ molecule has strong pπ - pπ bond.

S₈,Se₈ and Te₈ have only single bonds.

Answer is (a) Nitrogen

(due to small size and high electronegativity N-N is weak)

Answer is (b) exothermic and reversible process

(according to Le -Chatlier principle Solubility of gases in liquids decreases with rise in temperature)

अधिक मात्रा में वैद्युत-अपघट्य मिलाकर किसी कोलॉइडी विलयन की स्कन्दन (अवक्षेपण) क्रिया के लिए हार्डी-शुल्जे  ने निम्नलिखित दो नियम दिये, जिन्हें हार्डी-शुल्जे नियम कहते हैं |

1. कोलॉइडी विलयन के स्कन्दन के लिए मिलाये गये वैद्युत-अपघट्य के वे आयन सक्रिय होते हैं, जिनका आवेश कोलॉइडी कणों के आवेश के विपरीत होता है।

2. सॉल को स्कन्दित करने वाले आयन की शक्ति आयन की संयोजकता पर निर्भर होती है। समान संयोजकता वाले आयनों की स्कन्दित करने की शक्ति तथा मात्रा समान होती है। अधिक संयोजकता वाले आयनों की स्कन्दन क्षमता अधिक होती है, अर्थात् हार्डी-शुल्जे नियम के अनुसार, ‘आयनों की स्कन्दन शक्ति आयन की संयोजकता बढ़ने के साथ बढ़ती है।

Answer is (d) pH does not affect the primary structure of protein.

(pH effects the tertiary structure)

Answer is (b) 1 – Phenyl -3- bromopropane

((C₆H₅)CH₂CH = CH₂ + HBr (organic peroxide) \(\rightarrow\) (C₆H₅)CH₂CH₂CH₂Br anti-Markovnikov addition)

Answer is (c) 4

(Covalency of nitrogen is restricted to 4 due to non availability of d orbitals)

Answer is (b) It gives nitroethane on heating with aqueous solution of AgNO₂

(C₂H₅Br reacts with metallic Na to give butane , gives ethene on boiling with alcoholic potash. and forms C₂H₅SH (thiol) on heating with alcoholic KSH)

\(C_2H_5Br + KOH(aq.) \rightarrow C_2H_5OH + KBr\\C_2H_5Br + KOH(alc.)\rightarrow C_2H_4 + KBr + H_2O\)

The correct answer is Rabbit.

• Nocturnal animal
  • An animal behaviour where it is active during the night and sleeping during the day.
  • The common understanding is "nocturnal", versus diurnal meaning the opposite.
  • Examples-
    • Owls
    • Bats
    • Raccoon
    • Badger
    • Mouse
    • Cockroach
    • Moth
    • Firefly
    • Loris
    • Pangolins
    • Kibi
    • Wildcat 

The correct answer is Baking soda.

• Baking soda will help to neutralise a bee sting.

• Other Kitchen Remedies:
  • Cool compress - The cold decreases the swelling and redness.
  • Apple cider vinegar – It can neutralize the venom like baking soda.
  • Honey – The anti-oxidants in it may help with wound healing and pain - similar to its healing tendency for allergies.
  • Meat tenderizer - An enzyme in the seasoning counteracts the toxicity of the venom.

The correct answer is Mint.

• Mint herb grows from the stem.

• Herb
  • It has a short-sized plant with a soft, green stem without woody tissues.
  • Cycle - One or two seasons.
  • Branches -  few branches or branchless.
  • It is easily uprooted from the soil.
  • Nutritional benefits - Vitamins and minerals.
  • Examples - Tomato, wheat, paddy, grass and bananas.

The correct answer is Nyctophobia.

• Nyctophobia is the extreme fear of night or darkness.

​ 

• Cherophobia- It is the fear or phobia of being happy.
• Autophobia- It is the fear of being alone.
• Hodophobia- It is the fear of traveling or of Journey

The correct answer is Claustrophobia.

•  The fear of confined or crowded spaces is known as Claustrophobia.

• The fear of thunder and lightning is known as Astraphobia.
• The fear of snakes is known as Ophidiophobia.
• The fear of heights is known as Acrophobia.

1. Your excuse is accepted, you may go and sit in your place.

2. The government often adopted policies that made the poor and middle-class people to suffer.

3. My mother’s aide made a lot of different dishes and surprised us.

4. Are you all ready for the show?

5. Many experts believe it may be too late to prevent adverse consequences to the world’s climate system.

The correct answer is Acoustics.

• Acoustics is the branch of physics that is concerned with the study of sound.

• Numismatics is the study of coins and other currency units.
• Phonology is the study of sound structure in language. 
• Kymatology is the study of waves or wave motions.

• Phonology is used for the sound structure of words in language i.e. how a word is to pronounced.
• Acoustics is the branch of physics that is concerned with the study of sound i.e. properties of sound, sound waves and their motion, etc.