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Important Questions For Class 10 Maths- CBSE Board Exam
Here you will get the important questions for the CBSE Class 10 Mathematics Exam All the questions are prepared on the basis of the previous years' exam t. Class 10 maths notes according to FBISE syllabus. Contains solved exercises, review questions, MCQs, important board questions and chapter overview.� Questions and fun facts related to Class 10 Maths Notes will also be shared on our facebook page so you can ace your maths examination. If you find any mistake or any problem with the notes, please send us an email at [email protected]. Important Questions for CBSE Class 6 Maths Mensuration Chapter myCBSEguide has just released Chapter Wise Question Answers for class 6 Maths. There chapter wise Practice Questions with complete solutions are available for download in myCBSEguide website and mobile app. These Extra Questions with solution are prepared by our team of expert teachers who are teaching grade in CBSE schools for years. There are around set of solved Mathematics Extra questions from each and every chapter. The students will not miss any concept in these Chapter wise question that are specially designed to tac.

Name the acid present in the following: i Tomato ii Vinegar iii Tamarind Answer. The reaction is highly exothermic, therefore, constant cooling should be done. Explain how antacid works. Hyperacidity is caused by excess of hydrochloric acid in stomach. Antacid is basic in nature. It neutralizes excess of acid and gives relief from pain caused by hyperacidity.

Name two subtances which can be used as olfactory indicator. A white coloured powder is used by doctors for supporting fractured bones. Write balanced chemical equation for the change. Explain the action of dilute hydrochloric acid on the following with chemical equation: i Magnesium ribbon ii Sodium hydroxide iii Crushed egg shells Answer. State reason for the following statements: i Tap water conducts electricity whereas distilled water does not.

Therefore water is added to acid very slowly with cooling. Giving an activity illustrate how these are inter convertible. CuSO 4 is anhydrous copper sulphate. Aim: To show crystalline salts contain water of crystallization. Material Required: CuSO 4. Procedure: 1. Take 2g of CuSO 4. Observe its colour. Fit it with cork and delivery tube bent at two right angles which dips into a test tube. Heat crystals in boiling tube. Observe vapours being Byjus Class 12 Maths Important Questions For Pdf condensed in test tube. Cool the crystals and add few drops of water into Ch 10 Maths Class 10 Important Questions Us it.

Observation:Water vapours get condensed in a test tube and colour of blue crystals changes into white. On adding water to anhydrous copper sulphate it changes into blue again. Chemical Reaction : Conclusion : Crystalline substances have water of crystallization which are lost on heating. When we add water inCuSO 4 till a saturated solution is formed.

On cooling, it gets converted into CuSO 4. Write balanced chemical equation. Name the natural source of each of the following acid i Citric acid. Predict the nature of the solution. Write chemical equation. How will you prove its liberation? Bring a burning splinter near the gas.

It shows gas liberated is hydrogen. How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal? Bring a burning matchstick near the gas. Give an example. How can it be prevented? Rubbing of baking soda on the sting area gives relief. NaOH Sodium hydroxide. Acid reacts with Ca 3 PO 4 2 and cause tooth decay. It can be prevented by brushing teeth after every meal. Sodium hydrogencarbonate Baking soda neutralises formic acid giving relief.

A white powder is added while baking breads and cakes to make them soft and fluffy. Write the name of the powder. Name its main ingredients. Explain the function of each ingredient. Write the chemical reaction taking place when the powder is heated during baking. Baking powder. It consist of sodium hyrogencarbonate and tartaric acid. Sodium hydrogencarbonate gives CO 2 which makes cake soft and fluffy.

Tartaric acid neutralizes the bitterness due to sodium carbonate produced. Justify the statement. How is it converted into washing soda? Sodium hydrogencarbonate is a salt of sodium hydroxide strong base and carbonic acid weak acid. It is basic salt. It is converted into washing soda by heating followed by crystallization. Describe an activity with diagram to illustrate that the reaction of metal carbonates Class 10 Maths Ch 5 Important Questions Example and metal bicarbonates with acids produces carbon dioxide.

Write the relevant equations of all the reactions that take place. Name any two forms in which calcium carbonate is found in nature. Aim: To show acid reacts with metal carbonate to liberate carbon dioxide, Material Required: CaCO 3 marble chips , Woulfe-bottle, thistle funnel, dil.

HCl, gas jar, matchbox, delivery tube bent at two right angles, lime water. Take marble chips in a Woulfe-bottle. Set the apparatus as shown in diagram. Add dil. HCl with the help of thistle funnel. Collect the gas in gas jar by upward displacement of air. Bring a burning matchstick near the gas jar and record your observations. Pass the gas evolved through lime water and note down your observations. Observations: The burning matchstick will get extinguished because carbon dioxide is neither combustible nor supporter of combustion.

Lime water will turn milky due to formation of insoluble calcium carbonate. It can be used as test for CO 2. The chemical reactions taking place are as follows: Conclusion: Metal carbonates react with dilute acids to liberate carbon dioxide. Limestone, chalk, marble are different forms of calcium carbonate. All metal carbonates and hydrogen carbonates react with acids to form corresponding salts, water and carbon dioxide.

Write its formula and chemical name of this salt. Name the source from where it is obtained. Mention its colour and the reason due to which it has this colour. Write the chemical equation for it. Its formula is NaCl Sodium chloride.

It is obtained from sea water. Its chemical formula is NaCl. It may be white or light blue or yellow depending upon impurities present in it. How can it be verified? The compound is also formed by chlor-alkali process. Write chemical name and formula of X. Describe chlor-alkali process with balanced chemical equation. Name the type of reaction occurs when X is treated with dilute hydrochloric acid. Write the chemical equation.

When sodium chloride solution brine solution is electrolysed, sodium hydroxide solution is formed. H2 and Cl2 gases are liberated. This is chlor-alkali process. The above reaction is neutralization reaction.

If water is added to acid, bottle of acid will break. A student dropped few pieces of marble in dilute hydrochloric acid, contained in a test-tube. The evolved gas was then passed through lime water. What change would be observed in lime water? What will happen if excess of gas is passed through lime water?

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