Anushka Basak

EduRev Chemistry

Anushka Basak
EduRev Chemistry
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Discussed Questions
Pranjal Gupta upvoted   •  4 weeks ago

what is colloid.solutions

Juhi Ahuja answered
In a true solution, like salt water, NaCl molecules are totally mixed in the water, and the solution can pass through a semi-permeable film without getting divided. On the other hand, in a colloidal solution, the units are bigger and they don’t liquefy. However, they are equally dispersed all through a liquid. As such these units will not pass through a membrane as the liquid does.

Define impulse in physics short answer?

Pranjal Gupta answered  •  Feb 22, 2025
Definition of Impulse
Impulse in physics refers to the change in momentum of an object when a force is applied over a specific time interval. It is a vector quantity, meaning it has both magnitude and direction.
Key Components of Impulse
- Formula: Impulse (J) can be mathematically expressed as:
J = F * Δt
where F is the average force applied and Δt
... more
Pranjal Gupta upvoted   •  Feb 14, 2025

The number of carbon atoms in 1g of CaCO3 is-
  • a)
    6.022 × 1023
  • b)
    6.022 × 1021
  • c)
    3.0125 × 1022
  • d)
    1.204 × 1023
Correct answer is option 'B'. Can you explain this answer?

Dr Manju Sen answered
First we calculate the number of moles of CaCO3
Molecular weight of CaCO3 = 100g
Therefore, 100g of CaCO3 will have Avogadro number of molecules (6.022x10²³).
so 1g will have
   (6.022x10²³) x 1/100
= 6.022x10²¹
Now one molecule of CaCO3 has 1 carbon atom. So, 6.022x10²¹ molecules will have 6.022x10²¹ atoms of Carbon.
Answer is (b) 6.022x10²¹

Pranjal Gupta upvoted   •  Jan 31, 2025

कहानी के अंत में रामस्वरूप और गोपाल प्रसाद कैसे बाहर चले जाते हैं?
  • a)
    खुशी-खुशी और मजे करते हुए।
  • b)
    गुस्से में और बेइज्जती महसूस करते हुए।
  • c)
    शांतिपूर्वक और बिना कुछ कहे।
  • d)
    तेज़ी से और बिना किसी बातचीत के।
Correct answer is option 'B'. Can you explain this answer?

C K Academy answered
रामस्वरूप और गोपाल प्रसाद गुस्से में और बेइज्जती महसूस करते हुए बाहर चले जाते हैं। उमा के जवाबों और टिप्पणी ने उनकी स्थिति को कठिन बना दिया, जिससे वे नाराज और शर्मिंदा हो गए।

Pranjal Gupta upvoted   •  Jan 20, 2025

In the figure, if O is the centre of the circle and ∠BOA = 120°, then the value of x is
  • a)
    90°
  • b)
    60°
  • c)
    120°
  • d)
    30°
Correct answer is option 'B'. Can you explain this answer?

Mohit Rajpoot answered
∠BOA = 120° (Given)
∠AOC = 60° (Linear Pair)
In triangle OAC,
OA = OC (Radii of same circle)
∠OAC = ∠ OCA = x (angle opposite to equal sides are equal)
∵ ∠A + ∠C +∠O = 180°
⇒ x + x + 60 = 180°
⇒ 2x = 120°
⇒ x =60o

8 protons
10 neutrons
Write the following information about the element X
1. Atomic number of X
2. Atomic mass of X.
3. Valency electrons.
4. Valency of X?

Pranjal Gupta answered  •  Jan 15, 2025
1. Atomic Number of X
The atomic number is defined as the number of protons in an atom. For element X, which has 8 protons, the atomic number is:
- Atomic Number = 8
This indicates that element X is oxygen (O) on the periodic table.
2. Atomic Mass of X
The atomic mass is the total number of protons and neutrons in an atom. For element X, with 8 protons
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PQRS is a cyclic quadrilateral such that PR is the diameter of the circle. If ∠QPR = 64° and ∠SPR = 31°, then, ∠R =  ?
  • a)
    95°
  • b)
    64°
  • c)
    85°
  • d)
    31° 
Correct answer is option 'C'. Can you explain this answer?

Pranjal Gupta answered  •  Dec 13, 2024
Understanding the Problem
In cyclic quadrilateral PQRS, we know that PR is the diameter of the circle, which implies that angle QPR is an inscribed angle. Given:
- ∠QPR = 64°
- ∠SPR = 31°
We need to find ∠R.
Properties of Cyclic Quadrilaterals
- Opposite angles of a cyclic quadrilateral sum up to 180°.
- The angle subtended by a diameter
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Cot square 30 degree plus 4 cos square 45 degree + 3 cosec square 60 degree upon sec 60 degree + cosec 30 degree minus 10 square 60?

Pranjal Gupta answered  •  Nov 27, 2024
Step 1: Calculate Individual Trigonometric Values
- Cotangent of 30 degrees:
Cot 30 = 1/tan 30 = 1/(1/√3) = √3
- Cosine of 45 degrees:
Cos 45 = 1/√2 = √2/2
Therefore, Cos^2 45 = (√2/2)^2 = 1/2
- Cosecant of 60 degrees:
Cosec 60 = 1/sin 60 = 1/(√3/2) = 2/√3
Therefore, Cosec^2 60 = (2/√3)^2 = 4/3
- Secant of 60 degrees:
Sec 60 = 1/
... more

Which one of the following rivers has the largest drainage pattern in India?
[2010 (T-1)]
  • a)
    The Indus                   
  • b)
    The Ganga               
  • c)
    The Brahamaputra
  • d)
    The Mahanadi
Correct answer is option 'B'. Can you explain this answer?

Pranjal Gupta answered  •  Oct 12, 2024
Overview of Major Rivers in India
India is home to several major rivers, each with its unique characteristics and drainage patterns. Among these, the Ganga River stands out for its extensive drainage system.
The Ganga River's Drainage System
- The Ganga River is the longest river in India, stretching over 2,525 kilometers.
- It has a vast drainage basin, covering
... more

?

Pranjal Gupta answered  •  Oct 12, 2024
Features of Democratic Government
- Elections: Regular, free, and fair elections are held, allowing citizens to choose their representatives.
- Rule of Law: Laws apply equally to all individuals, ensuring justice and accountability.
- Fundamental Rights: Citizens enjoy fundamental rights such as freedom of speech, assembly, and religion.
- Politic
... more: Multiple political parties exist, providing choices to voters and encouraging diverse views.
- Participation: Citizens have the right to participate in political processes, influencing decision-making.
- Transparency: Government actions are open to scrutiny, fostering trust and accountability.
- Minority Rights: Protection of the rights of minority groups, ensuring their voices are heard and respected.
Features of Non-Democratic Government
- Centralized Power: Power is concentrated in the hands of a single leader or a small group, limiting political pluralism.
- Lack of Elections: Elections, if held, are often rigged or manipulated, denying genuine representation.
- Suppression of Rights: Citizens may face restrictions on freedoms such as speech, press, and assembly.
- No Political Pluralism: Dominance of one party or ideology, with opposition parties banned or severely restricted.
- Limited Participation: Citizens have little to no say in political processes or decision-making.
- Secrecy: Government operations are often opaque, with little accountability to the public.
- Disregard for Minorities: Minority rights are often ignored, leading to marginalization and discrimination.
Conclusion
Understanding the features of democratic and non-democratic governments is crucial in recognizing the importance of democracy in promoting individual rights, participation, and accountability. In contrast, non-democratic regimes often lead to oppression and limited freedoms, which can hinder societal progress and development.

What is one of the biggest challenge of independent India?

Pranjal Gupta answered  •  Sep 22, 2024
One of the Biggest Challenges of Independent India: Poverty
Poverty remains one of the most significant challenges faced by independent India. Despite economic growth and development, a large portion of the population continues to struggle with basic necessities.
Reasons for Poverty
- Inequality: Economic growth has not been evenly distributed, leading to a wide
... more

रामन् भावुक प्रकृति प्रेमी के अलावा और क्या थे?
  • a)
    एक किसान
  • b)
    एक वैज्ञानिक
  • c)
    एक व्यवसायी
  • d)
    एक अधिकारी।
Correct answer is option 'B'. Can you explain this answer?

Pranjal Gupta answered  •  Sep 02, 2024
रामन् का परिचय
रामन् एक बहुमुखी प्रतिभा के धनी व्यक्ति थे, जिनकी पहचान सिर्फ उनकी भावुक प्रकृति और प्रेमी छवि तक सीमित नहीं थी। वे एक वैज्ञानिक के रूप में भी प्रसिद्ध थे।

वैज्ञानिक उपलब्धियाँ
- रमन प्रभाव: रामन् ने अपने अनुसंधान से ‘रमन प्रभाव’ की खोज की, जो प्रकाश का एक अद्वितीय फैलाव है। यह खोज उन्हें 1930 में भौतिकी में नोबेल पुरस्कार दिलाने में सहायक
... more

A constant force acts on an object of mass 4kg for a duration of 2s. It increases the object's velocity from 4m/s to 8m/s. Find the magnitude of the applied force. Now if the force was applied for a duration of 5s, what would... more

Pranjal Gupta answered  •  Aug 09, 2024
Calculating the magnitude of the applied force:
- Initial velocity, u = 4 m/s
- Final velocity, v = 8 m/s
- Mass, m = 4 kg
- Duration, t = 2 s
Using the equation of motion:
v = u + at
8 = 4 + a * 2
a = 2 m/s²
Now, using Newton's second law of motion:
F = ma
F = 4 * 2

Therefore, the magnitude of the applied force is 8 N.... more

Majority of the reactions of alkynes are the examples of
  • a)
    electrophilic substitution
  • b)
    nucleophilic addition
  • c)
    electrophilic addition
  • d)
    nucleophilic substitution
Correct answer is option 'C'. Can you explain this answer?

Pranjal Gupta answered  •  May 24, 2024
Electrophilic Addition in Alkynes
Reactions involving alkynes often follow the mechanism of electrophilic addition. This is because alkynes are highly reactive due to the presence of two pi bonds, which can easily break to form new bonds with electrophiles.

Key Points:
- In electrophilic addition, an electrophile attacks the pi bond in the alkyne, leading to the
... more
Pranjal Gupta asked   •  Jul 20, 2023

How can I improve my writing skills for the CBSE Class 9 English exam?

Neha Banerjee answered
Improving Writing Skills for CBSE Class 9 English Exam

To improve your writing skills for the CBSE Class 9 English exam, you can follow these effective strategies:

1. Read extensively:
- Reading extensively helps you gain exposure to different writing styles, vocabulary, and sentence structures.
- Read a variety of genres such as fiction, non-fiction,
... more

Pranjal Gupta asked   •  Jul 31, 2022

Persistent nucellus in the seed is known as:    (2019)
  • a)
    Tegmen
  • b)
    Chalaza
  • c)
    Perisperm
  • d)
    Hilum
Correct answer is option 'C'. Can you explain this answer?

Aditya Mehta answered
The correct answer is option 'C', Perisperm.

Explanation:
- A seed typically consists of three main parts - the embryo, endosperm, and seed coat.
- The embryo is the tiny plant inside the seed that will grow into a new plant.
- The endosperm is a source of nutrients for the developing embryo, and it is usually the largest part of the seed.
- The seed coat is the oute
... more

Pranjal Gupta asked   •  Mar 14, 2022

त्रिपुरा का लघु उद्योग क्या है?
  • a)
    माचिस बनाना
  • b)
    अगरबत्तियों के लिए बाँस की सीखें तैयार करना
  • c)
    बर्तन बनाना
  • d)
    कशीदाकारी का कार्य
Correct answer is option 'B'. Can you explain this answer?

Sameer Chavan answered
This question does not provide any context or information to determine the correct answer. It simply asks for an explanation of the correct answer, which is option 'B'. Without any further details or context, it is not possible to explain why option 'B' is the correct answer. Additionally, the provided instructions mention that the answer should be less than 300 words and visually appealing, but s... more

Pranjal Gupta asked   •  Nov 11, 2021

पाठ को ध्यान से पढ़ें और प्रश्नों के उत्तर दें:
‘विष्णु-पुराण’ के प्रथम अंश के नवें अध्याय में इस अमृत-मंथन के कारणों का स्पष्ट उल्लेख है कि फूलों की माला का अपमान करने के प्रायश्चित स्वरूप देवताओं को अमृत-मंथन करना पड़ा। वह कथा इस प्रकार है कि दुर्वासा ऋषि ने पृथ्वी पर विचरण करते हुए एक कृशांगी के जिसकी बड़ी-बड़ी आँखें थी, हाथ में एक दिव्य माला देखी। उन्होंने उस विद्याधरी से उस माला को माँग लिया और उसे किसी अति विशिष्ट व्यक्ति की गर्दन में डालने की बात सोचने लगे।
तभी ऐरावत पर चढ़े देवताओं के साथ आते हुए इंद्र पर उनकी नज़र पड़ी उन्हें देखकर दुर्वासा ने उस माला को इंद्र के गले में डाल दिया लेकिन इंद्र ने अनिच्छापूर्वक ग्रहण करके उस माला को ऐरावत के मस्तक पर डाल दिया। ऐरावत उसकी गंध से इतना विचलित हो उठा कि फौरन सूंड से लेकर उसने माला को पृथ्वी पर फेंक दिया। संयोगवश वह माला दुर्वासा के ही पास जा गिरी। इंद्र को पहनाई गई माला की इतनी दुर्दशा देखकर दुर्वासा को क्रोध आना स्वाभाविक था। वह वापस इंद्र के पास लौटकर आए और कहने लगे ‘अरे ऐश्वर्य के घमंड में चूर अहंकारी! तू बड़ा ढीठ है, तूने मेरी दी हुई माला का कुछ भी आदर नहीं किया।
न तो तुमने माला पहनाते वक्त मेरे द्वारा दिए गए सम्मान के प्रति आभार व्यक्त किया और न ही तुमने उस माला का ही सम्मान किया। इसलिए अब तेरा ये त्रिलोकी वैभव नष्ट हो जाएगा। तेरा अहंकार तेरे विनाश का कारण है जिसके प्रभाव में तूने मेरी माला का अपमान किया। तू अब अनुनय-विनय करने का ढोंग भी मत करना। मैं उसके लिए क्षमा नहीं कर सकता।
प्रश्न: गद्यांश के माध्यम से क्या सीख दी गई है
... more

Aditi Sharma answered
घमंड विनाश का कारण है

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