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class 9 and 10 Half Yearly Question Papers and Model sample papers class 09 half yearly Sample question paper sep 2018/19 9th maths Half Yearly Exam (2018 – 2019) Sample paper prince public school-1 Download File 9th maths Half Yearly Exam (2018 – 2019) Sample paper prince public school-2 Download File 9th maths Half Yearly Exam (2018 – 2019) Sample paper Bloom public school-3 Download File 9th science Half Yearly Exam (2018 – 2019) Sample paper prince public school-1 Download File 9th science Half Yearly Exam (2018 – 2019) Sample paper prince public school-2 Download File 9th Science Half Yearly Exam (2018 – 2019) Sample paper Bloom public school-3 Download File class 10 half yearly Sample question paper Sep 2018/19 10th maths Half Yearly Exam (2018 – 2019) Sample paper prince public school-1 Download File 10th maths Half Yearly Exam (2018 – 2019) Sample paper prince public school-2 Download File 10th maths Half Yearly Exam (2018 – 2019) Sample paper Bloom public school-3 Downloa

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The language of chemistry class 7 Basic science soled questions. Q. What is chemistry? Ans: Chemistry is a branch of science in which we study the composition, structure, properties and change of matter. Q. What is matter? Ans: Anything that is around us having some mass and occupies space is called matter. Q. What are the different classifications of matter? Ans: Matters are classified into element, compound and mixture. Q. What is element? Ans: Elements are the purest form of substance (matter) made up of same kinds of particles. The smallest unit of element is an atom. eg. Hydrogen, oxygen, carbon. Q. What is compound?            See full post   The language of chemistry class 7 Basic science Class 07 Basic sciences Chapter the Language of Chemistry A. Answer these questions 1. What does the formula of a substance tell us? Answer: Formula of a compound or an element represents the name and number of atoms present in one molecule of that compound o

CBSE Class 7 Solved Objective Questions Chapter - Acids, Bases and Salts MCQs 1. The word acid comes from the Latin word ------ which means sour.( acere) 2. The substances used to test whether a substance is acidic or basic are known as ----(indicators) 3. The most commonly used natural indicator is litmus paper . It is extracted from ----(lichens) 4. In acidic solution, litmus paper turns into ------(red) 5. In basic solution, litmus paper turns into ------(blue) 6. In distilled water , litmus paper turns into ------(purple) 7. China rose indicator turns acidic solutions ------and basic solutions to ------ [dark pink (magenta) , green] 8. The reaction between an acid and a base is known as ----- [neutralization] 9. Salt and water are produced in neutralization process with the evolution of heat.[ water] 10. HCl + NaOH ----> ------- +   H 2 O   [NaCl] 11. Our stomach contains -------. It helps us to digest food[hydrochloric acid] 12. indigesti

Read Full Post: 7th Acids bases and Salts [Solved] :  Q1. What are acids? Ans. Acids are the substances which are sour in taste. Q2. What are bases? Ans. Bases are the substances which are bitter in taste & soapy to touch. Q3.Give examples of acids and bases. Ans. Acids- hydrochloric acid, acetic acid, citric acid, lactic acid etc Bases- baking soda, sodium hydroxide, soap etc Q 4. Name the acids present in the following substances. Substance Acid                                     Vinegar acetic acid Curd lactic acid                                 Guava oxalic acid Lemon citric acid                                   Amla citric acid Tamarind tartaric acid Q5. What are indicators? Give examples. Ans. Indicators are the special type of substances which are used to distinguish between acids & bases by showing colour changes. Example: litmus, turmeric, beetroot, China rose extract, phenolphthalein etc. Q6.Name the source from whi