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M C Q ch 2

Posted by Divya Divya 4 years, 2 months ago

CBSE > Class 10 > Science

4 answers

Saloni Harinkhede 4 years, 2 months ago

1. Some fruits like mango, lemon, raw grapes, orange, etc., have a sour taste due to the presence of: a. Acetic acid b. Citric acid c. Lactic acid d. Oxalic acid Answer. b. Citric acid 2. Zinc granules on treating with an acid X, form the zinc sulphate (ZnSO4) salt along with the evolution of a gas Y which burns with a pop sound when brought near to a burning candle. Identify the acid X and gas evolved Y. a. X- Sulphuric acid and Y- Oxygen gas b. X- Hydrochloric acid and Y- Oxygen gas c. X- Sulphuric acid and Y- Hydrogen gas d. X- Hydrochloric acid and Y- Hydrogen gas Answer. c. X- Sulphuric acid and Y- Hydrogen gas 3. The figure given below represents the experiment carried out between conc. sulphuric acid and sodium chloride, which react with each other to form HCl gas. Blue litmus paper is brought near the mouth of the delivery tube to check the presence of HCl acid but no change is observed in the color of litmus paper because: a. The litmus paper used is dry b. The litmus paper used is moist c. Blue litmus paper does not change its color with an acid d. The litmus paper is kept very close to the mouth of the delivery tube Answer. a. The litmus paper used is dry 4. Which of the following phenomena occur, when a small amount of acid is added to water? i. Ionisation ii. Neutralisation iii. Dilution iv. Salt formation (i) and (ii) (i) and (iii) (ii) and (iii) (ii) and (iv) Answer. b. (i) and (iii) 5. Which of the following indicators turn red in an acidic solution? i. Phenolphthalein ii. Litmus iii. Turmeric iv. Methyl orange Choose the correct option: (i) and (ii) (ii) and (iii) Only (ii) (ii) and (iv) Answer. d. (ii) and (iv) 6. Dilute acid does not produce carbon dioxide on being treated with: a. Marble b. Lime c. Baking soda d. Limestone Answer. b. Lime 7. The sample of soil from a particular place was tested for its pH value. It came out to be 5. Which one of the following should be added to the soil to make it suitable for the plant growth? i. Calcium chloride ii. Calcium Hydroxide iii. Calcium oxide Choose the correct option: Both (i) and (ii) Both (ii) and (iii) Only (i) Only (iii) Answer. b. Both (ii) and (iii) Also Check: CBSE Class 10 Science MCQs from Chapter 1: Chemical Reactions & Equations 8. Identify the products of the following reaction: Jagranjosh a. Calcium hydrogencarbonate and chlorine gas b. Calcium chloride and water c. Calcium oxide, carbon dioxide and water d. Calcium chloride, carbon dioxide and water Answer. d. Calcium chloride, carbon dioxide and water 9. An ant’s sting can be treated with …………which will neutralise the effect of the chemical injected by the ant’s sting into our skin. Choose the correct option from the following to be filled in the blank space: a. Methanoic acid b. formic acid c. Baking soda d. Caustic soda Answer. c. Baking soda 10. In the following reaction, identify the salt formed NH4OH (aq) + H2SO4 (aq) → _____ + 2H2O (l) a. NH4NO3 b. (NH4)2SO4 c. (NH4)3PO4 d. (NH4)2S Answer. b. (NH4)2SO4 11. Which of the following salt will give acidic solution when dissolved in water? a. NH4Cl b. NaCl c. Na2CO3 d. CH3COONa Answer. a. NH4Cl 12. Bleaching powder is used as a disinfectant for water to: a. Make water tastier b. Remove all the dirt from water c. Make water germ-free d. Make water clear Answer. c. Make water germ-free 13. Which among the following represents the chemical formula for ‘Plaster of Paris’? Jagranjosh 14. Which one of the following salts will dissolve in water to form an alkaline solution? a. Potassium carbonate b. Sodium chloride c. Sodium carbonate d. Potassium sulphate Answer. a. Potassium carbonate 15. Copper sulphate crystals when heated strongly, lose their water of crystallization to give anhydrous copper sulphate accompanied by a change in color from: a. Blue to green b. Blue to white c. Blue to sky blue d. Blue to grey Answer. b. Blue to white

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https://www.learncbse.in/mcq-questions-for-class-10-science-acids-bases-and-salts-with-answers/

Divya Divya 4 years, 2 months ago

Multiple choice questions of chapter 2 science

ANSWER

An mirror 4.0cm in size is placed at 25.0cm in front of concave mirror of focal length 15cm.find the nature, position and size of the image.

Posted by Dibyasmita Barik 4 years, 2 months ago

CBSE > Class 10 > Science

2 answers

Dibyasmita Barik 4 years, 2 months ago

Answer this question pls?

5Thank You

Divya Divya 4 years, 2 months ago

Multiple choice questions of chapter 2science

ANSWER

What are the various factors that cause stress

Posted by Akansha Negi 4 years, 2 months ago

CBSE > Class 10 > Information Technology (402)

0 answers

ANSWER

Geography class x chapter 2and 3 question answers

Posted by Pawan Khatiwara 4 years, 2 months ago

CBSE > Class 10 > Social Science

0 answers

ANSWER

What is displacement reactions?

Posted by Vikash Tomar 4 years, 2 months ago

CBSE > Class 10 > Science

4 answers

Vatika Singal 4 years, 2 months ago

It a reaction in which the more reactive metal displaces the less reactive metal by its salt solution.

Karthik Moyye 4 years, 2 months ago

Displacement reaction is a type of chemical reaction in which highly reactive element displaces less reactive element. Ex:- Fe+cuso4=feso4+cu Here iron is more reactive then copper.

2Thank You

Pankaj Kumar Patel 4 years, 2 months ago

In chemical reactions in which one molecule exchange their position in a compound is known as displacement reaction. For example Zn+H2so4_______ Znso4+H2.

Prabhjot Singh 4 years, 2 months ago

The reaction in which highly reactive elements displace less reactive elements is called displacement reaction

ANSWER

Ebuddy is an example of.......... im software.

Posted by X-O Harsh 4 years, 2 months ago

CBSE > Class 10 > Information Technology (402)

0 answers

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आपके विचार में देश प्रेम क्या है? इस कोरोना संक्रमण काल में देश सेवा किस प्रकार कर सकते है ? नेता जी का चश्मा पाठ के आधार पर लगभग 100 शब्दों में उत्तर लिखो ।

Posted by Namanpreet Kaur 4 years, 2 months ago

CBSE > Class 10 > हिंदी ए

1 answers

Soyansh Dhaiya 4 years, 2 months ago

Is paath Mein captain hai Aur Sipahi FIR koi Fauji yah Police Wala nahin tha uske andar dekh Bhakti ki Bhavna Bhari hui thi Desh Prem hua hai jo Shahid Ho chuke hain unke bare mein sochne Auron Yad karte Rahe Desh Prem Mein Kaun chij Hai Jo Har EK Bhartiya Ke Andar hai is chronicle Mein Desh Seva karne ke liye apne ghar mein rahe online classes Lijiye aur aur aur Logon ke Sankraman Mein mat Aaye

ANSWER

“He was the most trusting person I had ever met. Throw light on the positive attributes of Anil.

Posted by Zigyansh Bhardwaj 4 years, 2 months ago

CBSE > Class 10 > English Language and Literature

0 answers

ANSWER

Solve for x and y by elimination method : 4x-3y=7 x+2y=3

Posted by Stuti Purohit 4 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Hetvi Tandel 4 years, 2 months ago

(x, y) =(5/2, 1)

ANSWER

PIA . 2 ..= HE: + HYI 3. 1GITCHIGE... t... 4.. ..=7+ HITYIF 5. 9 4qtd=..+.. 6 = HIT: + 3Htq 7 TaARE. 8 ..= YETH: + f8 .. 9 ChTTTGYH.. 10. = YaH+ af

Posted by Krishna Kumar 4 years, 2 months ago

CBSE > Class 10 > संस्कृत (शेमुषी)

0 answers

ANSWER

P(x)= 3x^4+5x^3-7x^3-2x+2,g(x)=x^2+3x+1

Posted by Ranveer Singh 4 years, 2 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Amoeba shows followingg kind of nutrition

Posted by Preetham V Nayak 4 years, 2 months ago

CBSE > Class 10 > Science

4 answers

Vatika Singal 4 years, 2 months ago

It's show a holozoic nutrition.

Shiva Devotee 4 years, 2 months ago

Holozoic

Dev Ranjan Singh 4 years, 2 months ago

Holozoic

Prashant Kumar 4 years, 2 months ago

Phygoscatosis

ANSWER

How are the life of a commoner during the British rule? Explain about any incident from the history.

Posted by Saloni Harinkhede 4 years, 2 months ago

CBSE > Class 10 > English Language and Literature

0 answers

ANSWER

Different between autotrophs and heterotrophs

Posted by Bhumika Sharma 4 years, 2 months ago

CBSE > Class 10 > Science

1 answers

Sia ? 4 years, 2 months ago

Autotrophs	Heterotrophs
Type of Organisms
Usually members of the plant kingdom and certain unicellular organisms like cyanobacteria	All members of the animal kingdom
Mode of Nutrition
Autotrophs are producers which prepare their own food.	Heterotrophs are the consumers who depend on other sources for their food.
Classified into
These can be classified as photoautotrophs and chemoautotrophs.	These can be classified as photoheterotrophs and chemoheterotrophs.
Presence of chloroplasts
The chloroplast helps in preparing food.	They do not contain chloroplast, so cannot prepare food.
Energy is obtained from
They obtain energy from inorganic sources by converting light energy into chemical energy.	They obtain energy directly or indirectly from other organisms.
Energy Storage
Autotrophs can store light energy and chemical energy.	Heterotrophs cannot store energy.
In Food Chain
They are placed at the primary level in the food chain.	These are placed in the secondary or tertiary level in the food chain.
Locomotion
They cannot move from their place.	Can move from one place to another in search of food and shelter.
Examples
Green plants, algae and a few photosynthetic bacteria are examples of autotrophs.	Cows, buffaloes, tigers, horses, humans are examples of heterotrophs.

ANSWER

2x2+3X+1=0

Posted by Ashish Meena 4 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 4 years, 2 months ago

Given 2x²+3x+1=0
On comparing this equation with ax²+ bx + c = 0, where a = 2, b = 3, c = 1
∴ b²− 4ac = (5)²− 4 × 2 × 1
= 9 − 8
= 1
x = −b±b2−4ac / 2a
= −3±1 / 2×2
x = −3+1 / 4 or x = −3−1 / 4
x = −2 / 4 or x = −4 / 4
x = −1/2 or x = −1

ANSWER

Polynomial ex. 2.2

Posted by Komal Patel 4 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Chethas Reddy 4 years, 2 months ago

What is question about

ANSWER

What is Retraction

Posted by Aniket Rathour 4 years, 2 months ago

CBSE > Class 10 > Science

1 answers

Sia ? 4 years, 2 months ago

A retraction is a continuous mapping from a topological space into a subspace that preserves the position of all points in that subspace. The subspace is then called a retract of the original space.

ANSWER

The third zero of the polynomial x³-8x²+19x-12 if it's one zero is x=1 are

Posted by Reddem Bhanu 4 years, 2 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Waiting is a great problem,how?

Posted by Gyanendra Das 4 years, 2 months ago

CBSE > Class 10 > English Language and Literature

0 answers

ANSWER

Explain the phases of Indian National Congress. (Elaborate what had happened during those phases too.)

Posted by Pratheeksha Pratheeksha 4 years, 2 months ago

CBSE > Class 10 > Social Science

0 answers

ANSWER

Define different types of farming

Posted by Thakur Bhai Bhai 4 years, 2 months ago

CBSE > Class 10 > Social Science

1 answers

Sbs Gameing 4 years, 2 months ago

Types of farming : 1. Subsistence Farming :- It is done with primitive methods. Practiced on small patch of land with the help of primitive tools. 2. Commercial Farming :- Farming is practised with the intention of selling the production in market.

ANSWER

Nepali class 10 all books question answers

Posted by Pawan Khatiwara 4 years, 2 months ago

CBSE > Class 10 > Regional Language

0 answers

ANSWER

What is shifting agriculture. Explain its mechanism

Posted by Ishan Raj 4 years, 2 months ago

CBSE > Class 10 > Social Science

1 answers

Bharath Gv 4 years, 2 months ago

why martial law was imposed in punjab during the month of april in 1919

ANSWER

Define dynamo rule.

Posted by Pankaj Kumar Patel 4 years, 2 months ago

CBSE > Class 10 > Science

1 answers

Sia ? 4 years, 2 months ago

The electric dynamo uses rotating coils of wire and magnetic fields to convert mechanical rotation into a pulsing direct electric current through Faraday's law of induction and Lenz's law.

ANSWER

Mention the effect of the nationalism merging with imperialism?

Posted by Santosh Ram 4 years, 2 months ago

CBSE > Class 10 > Social Science

0 answers

ANSWER

5root is irrational

Posted by Jyoti Singh 4 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

User ....???.... 4 years, 1 month ago

Root 5 is an irrational number.

Reddy Patnam 4 years, 2 months ago

Yes , it's true

Madhav Taneja 4 years, 2 months ago

Yes √5 is irrational

ANSWER

What is the official language of sri lanka

Posted by Vinesh Laxman 4 years, 2 months ago

CBSE > Class 10 > Social Science

5 answers

Akshata Jadhav 4 years, 2 months ago

Sinhala

Rishità Samanta 4 years, 2 months ago

Sinhalese

Rishità Samanta 4 years, 2 months ago

Sinhala

Priyanshu Kumar Priyanshu Kumar 4 years, 2 months ago

Sinhal

Roshani Pal 4 years, 2 months ago

Sinhala

ANSWER

Nsheo

Posted by Naveen Chhikara 4 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 4 years, 2 months ago

Please ask question with complete information.

ANSWER

Find 2 consecutive positive integers ,sum of whose squares is 925.

Posted by Naveen Chhikara 4 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 4 years, 2 months ago

let first integer be x
then its consecutive integer be (x+1)
according to question
x^2 + (x+1)^2 = 925
2x^2 + 2x - 924 = 0
x^2 + x - 462 = 0
x = -1 +- √1 + 4*462 / 2
x = -1 +- 43/2
x = -1 + 43 /2 = 21
x = -1 - 43/2 = -22
x = 21 , -22