CBSE Class 9 Science Atoms and Molecules MCQs

Question : If isotopic distribution of C-12 & C-14 is 98% and 2% respect(d)ely, then number of C-14 atoms in 12 g of C is: (a) 1.244X1022 (b) 1.244X1023 (c) 3.88X1022 (d) 3.88X1022   Answer : A   Question : Identify the correct symbol of gold: (a) Go (…

CBSE Class 9 Science Is Matter Around us Pure MCQs

Question. When a bottle of soda water is opened, carbon dioxide escapes, producing a fizz. This is due to: a. Decrease in solubility on decreasing temperature b. Decrease in solubility on increasing temperature c. Decrease in solubility on decreasing pressure d. Decrease…

CBSE Class 10 Science HOTs Periodic Classification of Elements

MCQ Questions for NCERT Class 10 Science Periodic Classification of Elements Question. Pick out the chemically most reactive elements from the given triads. Li, Na, K F, Cl, Br (a) Li and F (b) Li and Br (c) K and F (d) K and Br Answer : C Question. Identify the…

CBSE Class 10 Science HOTs Metals and Non Metals

METALS & NON-METALS Question : The metallic lustre exhibited by sodium is explained by : (B) oscillation of mobile (A) diffusion of sodium ions valence electrons (C) existence of free protons (D) existence of body centered cubic lattice Answer : B Question : Which of the…

CBSE Class 10 Science HOTs Chemical Reactions and Equations

Question. Zinc reacts with silver nitrate to form which compounds? (a) Zn (NO3)2 + Ag (b) ZnNO3 + Ag (c) AgNO3 + Zn (NO3)2 (d) Ag + Zn (NO3)3 Answer : A Question. Which of the following statements about the given reaction are correct? 3Fe(s) + 4H2O(g) → Fe3O4(g) + 4H2(g) (i)…

CBSE Class 10 Science Chemistry Study of properties of HCI Acid and NaOH Assignment

Objective: To carry out reactions of Hydrochloric acid and NaOH with: (a) Blue / red litmus, (b) Zn Metal, and (c) Sodium Bicarbonate. Requirement: Test tubes, litmus papers, Zn granule, solid NaHCO3, match box, dil. HCl acid, dil. NaOH solution, etc. Procedure: Take one…

CBSE Class 10 Science Chemistry Saponification Preparation of Soap Assignment

Objective: To study Saponification reaction for the preparation of Soap. Requirements: Sodium hydroxide, vegetable oil, ethanol, common salt, distilled water, beakers, measuring cylinder etc. Theory : Soaps are sodium or potassium salts of carboxylic acids with long…

CBSE Class 10 Science Chemistry Properties of Acetic Acid Assignment

Objective: To study two physical and two chemical properties of acetic acid. Requirements: Test tubes, Glass tubes (or dropper), Glacial acetic acid, ethanol, con. H2SO4, saturated solution of NaHCO3, lime water, etc. Concepts: Molecular formula: CH3COOH Structural formula…

CBSE Class 10 Science Chemistry Displacement Reaction and Reactivity Series Assignment

Objective: To study the interaction of metals namely copper, iron, zinc and Aluminium with their salt solutions and arrange them according to their reactivity. Principle: More reactive metals displace less reactive metals from their compounds. Example: CuSO4 + Fe →…

CBSE Class 10 Science Chemistry Different Types of Chemical Reactions Assignment

Combination reaction Objectives: To study the Combination reaction of Quick lime (CaO) in water Requirements: CaO, water, beaker, thermometer, stirrer, etc. Points to remember: 1. CaO is a white powder 2. It reacts with water to form slaked lime [Ca(OH)2] 3. This process…

CBSE Class 10 Science Chemistry Determination of pH Assignment

Objective: To find the pH of Dil HCl, Dil. NaOH, Dil. Acetic Acid, Lemon Juice, Water and Dil. NaHCO3 solution, using pH paper (or Universal Indicator). Requirements: strips of pH paper, test tubes, standard pH reference chart, and various samples Procedure: Take 1 ml of the…

CBSE Class 10 Science Chemistry Cleaning Capacity of Soap Assignment

Aim: To study the comparative cleaning capacity of a sample of soap in soft and hard water. Materials required: beakers, test tubes,Distilled water, Calcium chloride,glass rods,Pre -prepared soap solution ,Measuring cylinder ,Measuring scale etc Theory: Although soap is a…

CBSE Class 10 Chemistry Revision Worksheet Set D

Q1. An iron salt ‘X’ on heating produces a brown coloured solid oxide ‘Y’ and releases suphur oxides. Identify X and Y. Which type of reaction is this? Write balanced chemical equation for this reaction. Q2. Identify the oxidizing agent and reducing agent in the following…

CBSE Class 10 Chemistry Periodic Classification Of Elements Worksheet Set B

Objective Questions Question : Which type of compound is formed by the elements of group 1 and group 17?  a. covalent compound b. Organo-metallic compounds c. coordinate compound d. Ionic compound Answer : D  Explanation: Elements of group 1 can…

CBSE Class 10 Chemistry Periodic Classification Of Elements Worksheet Set A

Question : An element X (2, 8, 2) combines separately with (SO4)2–and (PO4)3– radicals. The chemical formulae of the compounds are (a) X2SO4 : X3(PO4)2 (b) XSO4 : X3(PO4)2 (c) X(SO4)2 : X2(PO4)3 (d) XSO4 : X3(PO4)3  Answer : B Question…