Mark the correct answer in each of the following.
(a) Fire is energy.
(b) Fire is heat and light.
(c) Fire is the result of a chemical reaction.
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Tick (√) mark the correct answer in each of the following: (a) Fat is completely digested in the
(a) Fat is completely digested in the (iii) small intestine √ (b) Water from the undigested food is absorbed mainly in the (iv) large intestine √
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Read the extract given below and answer the questions that follow. Write the answer in your answer sheet in one or two lines only.
(i) The frog (ii) The Nightingale (iii) The speaker refers it as poor because she is dead (iv) She died when the veins of her neck bursted.
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Read the extract given below and answer the questions that follow. Write the answer in your answer sheet in one or two lines only?
(i) Calpurnia is the speaker of the above lines. (ii) Calpurnia saw bad omens in her dream regarding Caesar. So, she is worried for him. (iii) Calpurnia is afraid for Caesar’s life...
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In a voltmeter there are 20 divisions between the 0 mark and 0.5 V mark. Calculate the least count of the voltmeter.
Range of voltmeter, VR = 0.5 V Number of divisions in voltmeter, VN = 20 Least count of voltmeter = VR / V N = 0.5 / 20 = 0.025 V
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Define a chemical reaction. State four observations which help us to determine that a chemical reaction
Process in which new substances with new properties are formed by the rearrangement of atoms is known as chemical reaction. (i) Evolution of gas : The chemical reaction between zinc and...
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Mark the correct options. (a) The luminous efficiency of a monochromatic source is always greater than that of a white light source of same power.
(b) The luminous efficiency of a monochromatic source of wavelength 555 nm is always greater than that of a white light source of same power. (c) The illuminating power of a...
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Identify the result of chemical reaction between permanganate ion and Br- ?
MnO2 and BrO3 - are formed.
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Define a chemical reaction. State four observations which help us to determine that a chemical reaction has taken place.
Process in which new substances with new properties are formed by the rearrangement of atoms is known as a chemical reaction. (i) Evolution of gas: The chemical reaction between zinc and dilute H2SO4. Zn(s)+H2SO4(aq) → ZnSO4(sq) +H2(g)↑ (ii) Change in...
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Identify the type of chemical reaction and also write the chemical equation for the reaction that takes place when a solution of potassium
AgNO3(aq) + KCl(aq) → AgCl(s) + KNO3(aq) It is a double displacement reaction. Siiver chloride / Potassium nitrate
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Describe the following chemical properties of carbon compounds briefly and give one chemical reaction for each :
(i) Combustion: CH4+O2→ CO2+H2O+Energy+Light (ii) Addition CH2=CH2+H2+Ni →C2H6 (iii) Substitution CH4+Cl2+Sunlight → CH3Cl+HCl (iv) Esterification CH3COOH+C2H5OH+H+ →CH3COOC2H5+H2O (v) Oxidation C2H5OH+alk KMnO4 →CH3COOH.
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