9th
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- Sketch and label the figures of the following plants and explain them into brief. Marchantia, Funaria, Fern, Spirogyra. a) Marchantia: It belongs to the division Bryophyta and subkingdom cryptograms. These plants grows in damp ground and on the wall in the rai... 1
- Write the characteristics of the plants belonging to division Bryophyta. Bryophyta group of plants are called the amphibians of the plant kingdom because they grow in moist soil but need water for reproduction. Th... 1
- Sketch, label and describe the Spirogyra. Spirogyra is free floating green algae mainly found in fresh water . It has a filamentous structure. It has spiral shape chloroplast. They c... 1
- Write a paragraph in your own words about the ornamental plants called ferns. Ferns belong to the group of plants called Pteridophyta. They have well-developed roots, stem and leaves but do not bear flowers and fruits.... 1
- Distinguish between monocots and dicots. Dicots Monocots Seed Two cotyledons Single cotyledon Root Well developed, primary root (Taproot) Fibrous roots Stem Strong, hard. e.g. Banya... 1
- Write the characteristics of subkingdom Phanerogams. Plants which have special structures for reproduction and produce seeds are called Phanerogams. In these plants, after the process of reprod... 1
- Complete the sentences by filling in the blanks and explain those statements. a. Thallophyta plants have soft and fibre-like body. b. Bryophyta is called the 'amphibian' of the plant kingdom. c. In pteridophytes, asexu... 1
- Match the proper terms from columns A and C with the description in column B. A B C Thallophyta These plants mainly grow in water Algae Bryophyta These plants need water for reproduction Moss Pteridophyta Tissues are p... 1
- Classify aqueous solutions of the following substances according to their pH into three groups : 7, more than 7, less Substances pH Value Common salt equal to 7 Sodium acetate greater than 7 Hydrochloric acid less than 7 Carbon dioxide less than 7 Potassium... 1
- state the difference Negative electrode and positive electrode. Negative Electrode Positive Electrode Refers to a piece of electrochemical cell that is the negative pole Refers to a piece of electrochemic... 1
- State the differences. Cation and anion Cations Anions Positively charged particles Negatively charged particles Formed by loss of electrons from metals Formed by gain of electrons... 1
- State the differences. 1. Acids and bases Acid Base Substance which when dissolved in water gives hydrogen ion Substance which when dissolved in water can accept hydrogen ions Substa... 1
- Buttermilk spoils if kept in a copper or brass container. Buttermilk spoils if kept in a copper or brass container because Brass or copper reacts with organic acid. Buttermilk contains lactic acid a... 1
- Hydronium ions are always in the form H3 O+ The strength of an acid is measured in terms of the extent of the dissociation of acid in an aqueous solution. The higher H⁺ ion concentrati... 1
- Explain what is meant by electrolysis of water. Write the electrode reactions and explain them Electrolysis of water : When electric current is passed through water containing a few drops of an acid or a few drops of a base, it dissoci... 1
- What is meant by neutralization? Give two examples from everyday life of the neutralization reaction. Neutralization reaction : A neutralization reaction is a reaction in which an acid and a base reacts to form water and a salt. It involves t... 2
- Classify the acids according to their basicity and give one example of each type. The number of ionizable hydrogen (H⁺) ions obtainable by dissociation of one molecule of an acid is called its basicity For example : HCl --... 2
- Obtain a sample of rainwater. Add to it a few drops of universal indicator. Measure its pH. This is an activity based question in which you are supposed to collect rainwater from different places. If we take samples of rain water fr... 1
- Write down the concentration of each of the following solutions in g/L and mol/L. 4) 4.9 g H2SO4 in 200 mL solution Given: Volume of solution = 200ml =0.2L, Mass of CH₃COOH in gram =4.9g Molecular Formula = H₂SO₄ Molecular mass of H₂SO₄ = 2(H)+1(S)+4(O) =... 1
- Write down the concentration of each of the following solutions in g/L and mol/L. 3) 3g CH3COOH in 100 mL solution Given: Volume of solution = 100ml =0.1L, Mass of CH₃COOH in gram =3g Molecular Formula = CH₃COOH Molecular mass of CH₃COOH = 2(C)+2(O)+4(H)... 1
- Write down the concentration of each of the following solutions in g/L and mol/L. 2) 2g NaOH in 50 mL solution Given: Volume of solution = 50ml =0.05L, Mass of NaOH in gram =2g Molecular Formula = NaOH Molecular mass of NaOH = 23 +16 + 1 = 40m Mass of... 1
- Write down the concentration of each of the following solutions in g/L and mol/L. 1) 7.3g HCl in 100ml solution Given: Volume of solution = 100ml =0.1L, Mass of Solute in gram =7.3g Molecular Formula = HCL Molecular mass of HCl = 1+35.5=36.5 m Mass of... 1
- Show the dissociation of the following compounds on dissolving in water, with the help of chemical equation and (i) HCl underrightarrowwater H^(+ )+ Cl⁻ Dissociation is large (ii) NaCl underrightarrowwater Na⁺ + Cl⁻ Dissociation is large (iii) KOH unde... 2
- Formation of a magnesium chloride from magnesium and chlorine. Atomic number of Magnesium atom is 12. Electronic configuration is : Mg = 2, 8, 2 So it contains 2 valence electron. In order to achieve the... 1