CBSE Class 10 - Chemistry - Assertion Reason Based Questions (#classs10Chemistry)(#eduvictors)

CBSE Class 10 - Chemistry - Assertion Reason Based Questions

Assertion and Reasoning based questions are a bit tricky. You should be able to distinguish whether the assertion is well connected to the reason or these are just random facts. Read both statements carefully, and check if both statements are factually or logically correct or not. If both are correct, then try to check if both are well connected to each other or not.

The questions below consist of statements of an Assertion and a Reason. Use the following key to choose an appropriate answer:

(A) If both assertion and reason are CORRECT and the reason is the CORRECT explanation of the assertion.
(B) If both assertion and reason are CORRECT, but the reason is NOT THE CORRECT explanation of the assertion.
(C) If assertion is CORRECT, but reason is INCORRECT
(D) If assertion is INCORRECT, but reason is CORRECT



QUESTIONS:

1.  ASSERTION:  Combustion reactions are also called exothermic oxidation reactions.
     REASON:  In these reactions, oxygen is added and heat energy is released.

CBSE Class 10 Chemistry - Metals and Non-Metals (MCQs) (#eduvictors)(#cbsenotes)

Class 10 Chemistry - Metals and Non-Metals

Multiple Choice Questions (MCQs)

Class 10 - Chemistry - Chapter 2 - Acids, Bases and Salts (MCQs-2) (#eduvictors)(#class10Chemistry)

Acids, Bases and Salts (MCQs-2)

Class 10 - Chemistry

Q1:  Which one at the following is acidic?

(a) Lemon juice 

(b) tomatoes 

(c) Milk 

(d) All of these

Q2: Which one of the following will turn red litmus blue?

(a) Vinegar 

(b) Baking soda solution 

(c) Lemon juice

(d) Soft drinks

Q3: Which one of the following will turn blue litmus red

(a) Vinegar

(b) Lime water

(c) baking soda solution 

(d) Washing soda solution

Class 10 - Chemistry - Chapter - Acids and Bases - Keys Points To Remember (#class10Chemistry)(#cbsenotes)(#eduvictors)

 Acids and Bases 

Class 10 - Chemistry 

(Important Points To Remember)

⑴ Acids are the substances which taste sour, change blue litmus red, are corrosive to metals and furnish H⁺ ions in their aqueous solutions.

⑵ Bases are the substances which taste bitter, change red litmus blue, feel slippery and furnish OH⁻ ions in their aqueous solutions.

⑶ Acid-base indicators are dyes or mixtures of dyes which are used to indicate the presence of acids and bases.

⑷ Indicators are the substances that show one colour in an acidic medium and another colour in a basic medium. Litmus, phenolphthalein and methyl orange are commonly used indicators. Onion, Vanilla extract and Clove oil are olfactory indicators.

CBSE Class 10 - Chemistry - Acids and Bases - Indicators (#class10ChemistryNotes)(#eduvictors)(#cbsenotes)

Chemistry - Acids and Bases - Indicators

Questions and Answers

Q1: Why there is a need for indicators to test acids and bases?

Answer: It would be too dangerous to taste a liquid to find out if it was acidic or basic. Chemists use substances or dyes called indicators which change colour or odour when they are added to acids or bases.


Q2: What is an indicator? Give examples of indicators.

Answer:  An indicator is a dye or substance that changes colour or its smell when it is put into acid or a base. An indicator gives different colours in acid and base. Thus an indicator tells us if the given substance is an acid or base by changing its colour. The three common indicators are: Litmus, Methyl orange, phenolphthalein.


Q3: What are different types of indicators?

CBSE Class 10 - Chemistry - Chemical Reactions and Equations - MCQs and Other Resources (#cbsenotes)(#eduvictors)

Chemical Reactions and Equations

MCQs & Other Resources

Class 10 - Chemistry

The transformation of chemical substance into a new chemical substance by making and breaking of bonds between different atoms is known as Chemical Reaction.  Chemical equations are balanced to satisfy the law of conservation of mass.

Here are MCQs, study notes and other useful links:

Class 10 - Chemistry - Carbon and Its Compounds (NCERT In Text Activities Solved) (#cbsenotes)(#eduvictors)

Class 10 - Chemistry

Carbon and Its Compounds 

(NCERT In Text Activities Solved)

Activity 4.1
● Make a list of ten things you have used or consumed since the morning.

● Compile this list with the lists made by your classmates and then sort the items into the adjacent Table.

● If there are items which are made up of more than one material, put them into both the relevant columns.

Answer:

(C) -> Indicates carbon-based material.

CBSE Class 10 - All Subjects Sample Question Papers (2018-19) (#cbsepapers)(#eduvictors)

CBSE Class 10 -
 Sample Question Papers (2018-19)

All Subjects

The Central Board of Secondary Education (CBSE) conducts Class 10 Board examinations every year in March. All examination questions depend on this prospectus so students should know about any updates that are made by NCERT. For the examinations, students can likewise download the CBSE board test papers for class 10 free PDF download and work on taking care of issues with us.

By solving the CBSE test papers for class 10, candidates will figure out how to distinguish question paper examples and patterns, answer necessities, kinds of trap questions and the sky is the limit from there. Students are urged to endeavor test question papers inside the predefined time limit. The papers empower them  to find the correct technique and answers for ordinarily made questions. They are urged to solve the problems within the recommended time with the goal that they may assess their regions of solidarity and focus on those they are feeble in.

To endeavor board exam understudies require a great deal of training as ridicule tests and test papers that will plan and empower them to compose the Class 10 CBSE Board Examination with certainty. Since it is the main board exam a kid shows up for there is frequently a great deal of fear included. Explaining these example papers supports certainty and mitigates the dread of board examinations that a great deal of students have.

Here are sample question papers on various subjects for class 10 (session: 2018-19) along with answers and marking schemes:

Class 10 - Chemistry - Carbon and Its Compounds - Study Notes - Download PDF (#cbsenotes)(#eduvictors)

CBSE Class 10 - Chemistry 
 Carbon and Its Compounds - Study Notes (PDF)

Chemistry is that branch of science which deals with the composition, structure and properties of matter. Organic chemistry is predominantly concerned with the reactions that organic molecules undergo. Hydrocarbons are compounds that contain only carbon and hydrogen atoms. Carboxylic acids contain both a carbonyl group (C=O) and a hydroxyl group (–OH) on a terminal carbon. Carboxylic acids, like aldehydes, are terminal functional groups.

Here follows the class 10 Chemistry - Carbon and Its Compounds notes available as pdf file.

Class 11/10/9/8 - Chemistry - Uses of Gases (Worksheet) (#eduvictors)(#cbsenotes)

Uses of Gases 

(Worksheet)

Fill the blanks:

1. The gas that can be used to fill party balloons is _______.

2. The gas that is used to make flash light is _______ .

3. The gas widely used in advertisement signs is _______.

4. The gas present in tungsten bulb is _______.

5. The gas present in the universe is _______.

CLASS 10 - CHEMISTRY - CHEMICAL REACTIONS AND EQUATIONS - Chapter Summary Notes (#eduvictors)(#cbsenotes)

CHEMICAL REACTIONS AND EQUATIONS

Chapter Summary Notes

1. Chemical reaction — 

Chemical changes or chemical reactions are the changes in which one or more new substances are formed.

2. Chemical Equations – 

Representation of a chemical reaction in terms of symbols and formulae of the reactants and products is known as a chemical equation.

3. Balanced Chemical equations – 

The chemical equation in which the no. of atoms of different elements is same on both sides of the arrow is called balanced chemical equation.

4. The chemical reactions can be classified into different types such as—

a. Combination reaction.
b. Decomposition reaction.
c. Displacement reaction.
 d. Double Displacement reaction.
i. Precipitation reaction
ii. Neutralization reaction
e. Redox reaction

CBSE Class 10 - Chemistry - Ch5 - Periodic Classification Of Elements (Concept Points) (#cbseNotes)

PERIODIC CLASSIFICATION OF ELEMENTS (Concept Points)

Modern Periodic Table
credits: By Mbenzdabest (Own work) [CC BY-SA 4.0 ],
via Wikimedia Commons

1. Early chemists classified elements as metals and non-metals on the basis of a set of physical and chemical properties.

2. Dobereiner classified elements on the basis of “Law of Triads” which states that “atomic mass of the middle element of a triad is almost the arithmetic mean of the other two elements”.


3. A triad of elements is a group of three elements arranged in the order of increasing atomic masses, such that a group of such elements have similar physical and chemical properties.


4. Newland classified elements on the basis of “Law of Octaves” stated by him. According to
this law :
“When the elements are arranged in the order of increasing atomic mass, the properties of the eighth element (starting from a given element) are a repetition of the properties of the first element.”

CBSE Class 10 - Chemistry - Chapter 4 - Carbon and its Compounds - Important Points To Memorise (#cbsenotes)

Carbon and its Compounds 

Important Points To Memorise

1. Carbon forms a large variety of compounds because of its tetra-valency and the property of catenation.


2. Hydrocarbons are the compounds of carbon and hydrogen.


3. Hydrocarbons are of two types – saturated hydrocarbons (alkanes) and unsaturated hydrocarbons (alkenes and alkynes)

CBSE Class 10 -Chemistry - Metals and Non-Metals (Short Q and A)(#cbseNotes)

Metals and Non-Metals (Short Q and A)

Q1: Define Element.

Answer: An element is a pure substance which is made up of same kind of atom which differs from their physical and chemical properties.


Q2: How many elements are known so far? How many of them are naturally occurring?

Answer: 118 under which 92 are naturally occurring.


Q3: Give examples of the most abundant elements.

Answer: Aluminium ( the most) and Iron


Q4: Which is the most abundant non-metal?

Answer: Oxygen (O)


Q5: Give examples of the least reactive metals.

Answer:
• Gold
• Silver
• Platinum

CBSE Class 10 - Chemistry - Metals and Non-Metals - Alloys Their Compositions and Uses (#cbseNotes)

Alloys - Compositions, Properties and Uses

① Steel
Components: Iron, Carbon

Properties: Hard and Strong

Uses:
- Construction of buildings and bridges,
- manufacture of ships
- manufacture of spare parts for automobiles

☛You may download this blog post as a PDF File

CBSE Class 10 - Chemistry - Acids and Bases - pH of common Acids, Bases and Salts (#cbseNotes)

pH of common Acids, Bases and Salts

The acidity of an aqueous solution relies on the concentration of hydronium ions, [H₃O⁺]. For various products (acids, bases and salts), the magnitude of this concentration varies and pH scale is used conveniently. The pH of a solution is defined as the negative base-10 logarithm of the hydronium ion concentration (in mol/L). Here follows a partial list of pH of common acids, bases and salts.

Solution	PH range
HCL	1.0 - 2.0
Gastric Juices	1.4 - 2.0
Lemon Juice	2.0- 3.0
Vinegar	4.0
Tomato Juice (Oxalic Acid)	4.1
Coffee	5.0
Milk (Lactic Acid)	6.5

CBSE Class 10 - Chemistry - 23 HOTS Questions on Chemical Reactions You Must Know - Q and A (#cbsenotes)

23 HOTS Questions on Chemical Reactions You Must Know

Class 10 - Chemistry - Q & A

Q1: A white coloured water insoluble substance X on reacting with dilute H₂SO₄ released a colourless and odourless gas accompanied by brisk effervescence. When the gas was passed through water, the solution obtained turned blue litmus red. On bubbling the gas through lime water, it initially became milky and milkiness disappeared when the gas was passed in excess. Identify the substance X‘. Write its chemical equations of the reactions involved.

Answer: Calcium carbonate on reacting with dilute sulphuric acid releases a colourless and odourless gas carbon dioxide accompanied  by brisk effervescence.

The chemical equation for this reaction is
CaCO₃ + H₂SO₄ → CaSO₄ + H₂O + CO₂

Ca(OH)₂(aq) + CO₂(g) → CaCO₃(s) + H₂O(l)
milky

CO₂ (g) + CaCO₃ (s) + H₂O (l) ⇌ Ca(HCO₃)₂ (aq)
(colourless)



Q2: Ahmad took a magnesium ribbon (cleaned) and burned it on a flame. The white powder formed was taken in a test tube and water was added to it. He then tested the solution formed with red and blue litmus paper. What change was seen? Why?


Answer:
⒜ Red litmus paper turned blue.
⒝ Blue litmus paper remained blue.

This is because the magnesium ribbon on burning in air forms the white magnesium oxide. MgO when dissolves in water, it forms magnesium hydroxide, which is basic in nature.

2Mg + O₂ → 2MgO

MgO + H₂O → Mg(OH)₂ (aq) + H₂(g)

CBSE Class 10 Chemistry - CH2 Acids and Bases - Very Short Questions and Answers (#cbsenotes)

Acids and Bases  

Very Short Questions and Answers

Class 10 Science - Chemistry

Q1: What is an acid?

Answer: Acid is a compound which yields hydrogen ions (H⁺) or Hydronium (H₃O⁺) ions , when dissolved in water.


Q2: What is the pH value of acids?

Answer: Less than 7 (i.e. 0 to < 7)


Q3: What is the taste of acids?

Answer: Sour


Q4: What happens to blue litmus paper when it comes in contact with acid solution?

Answer: It turns into red.


Q5: On the basis of origin, how acids are classified as?

Answer: Organic acids and Mineral acids.

CBSE Class 8/10 - Metals vs Non-Metals (Comparison) (#cbseNotes)

Metals vs Non-Metals

Physical Properties Comparison

Property	Metals	Non Metals
Physical State	Most metals are solids at room temperature except mercury which is a liquid. Gallium and Cesium also changes into liquid at slightly above room temperature.	Non Metals exist in all states. Eleven are gases, bromine is liquid while others are solids.
Melting and Boiling Point	Generally have high melting and boiling points. (Exceptions are Gallium, Mercury, Sodium and Potassium.)	Generally they have low melting and boiling points. Exceptions are: Carbon, Boron and Silicon.
Density	They have high density except Sodium and potassium.	Low denisty (Diamond is an exception.)
Lusture	Metals shine and are lustrous.	Non-metalls appear dull. (Exceptions are Diamond, graphite and iodine.)

CBSE Class 10 - Science - Four New Elements Added In Periodic Table

Four New Elements Added In 

Periodic Table

Time to update Chemistry Textbooks. On December 30, IUPAC completes the verification of discoveries of four new chemical elements. It completes the 7 periodic row.

The atomic numbers of these four new elements are 113, 115, 117 and 118. Soon the new names will be given to these elements. At present these elements have temporary names i.e.

Ununtrium 113, 
Ununpentium 115, 
Ununseptium 117, 
Ununoctium 118