Chemistry Questions And Answers
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Chemistry Questions And Answers
Question 1 Which of the below following is not a type of elements
- Non Metals
Question 2 Which of the below acid is found in lemon?
- Lactic acid
- Tartaric acid
- Marlic acid
- Citric acid
Question 3 Artificial rain is produced by?
- Silver iodide
- Carbon monoxide
- Silver nitrate
- Copper oxide
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Question 4 Which of the following is the most electronegative element?
Question 5 Milk is a—
- None of these
Question 6 Bar is a unit of—
Question 7 Which element is necessary for construction is nuclear reactors?
Question 8 Who is known as father of modern chemistry?
- V. Raman
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Question 9 The mass number of an atom is equal to
- The number of nucleons
- The number of neutrons
- The number of protons
- The number of protons and electrons
Question 10 The number of waves in n x 10th Bohr’s orbit are
Question 11 The material which can be deformed permanently by heat and pressure is known as
- Chemical compound
Question 12 Acid reaches with bases to give Salt.
Question 13 Which if the following fuel is has the maximum calorific value?
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Question 14 Ba is the most powerful reducing agent.
Question 15 In Langmuir’s model of adsorption of a gas on a solid surface
- The mass of gas striking a given area of surface is proportional to the pressure of the gas
- The mass of gas striking a given area of surface is independent of the pressure of the gas
- The rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered
- The adsorption at a single site on the surface may involve multiple molecules at the same time
Question 16 Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl
- Oxidises oxalic acid to carbon dioxide and water
- Reduces permanganate to mn2+
- Gets oxidised by oxalic acid to chlorine
- Furnishes h+ ions in addition to those from oxalic acid
Question 17 A metal, M forms chlorides in its +2 and +4 oxidation states. Which of the following statements about these chlorides is correct?
- MCl2 is more soluble in anhydrous ethanol than MCl4
- MCl2 is more easily hydrolysed than MCl4
- MCl2 is more volatile than MCl4
- MCl2 is more ionic than MCl4
Question 18 Luorobenzene (C6H5F) can be synthesized in the laboratory
- From aniline by diazotisation followed by heating the diazonium salt with HBF4
- By reacting bromobenzene with naf solution
- By heating phenol with HF and KF
- By direct fluorination of benzene with F2 gas
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Question 19 The pyrimidine bases present in DNA are
- Cytosine and uracil
- Cytosine and thymine
- Cytosine and adenine
- Cytosine and guanine
Question 20 The isotopes of chlorine with mass number 35 and 37 exist in the ratio of _
- 1 :2
- 2 :3
- 3 : 1
- 3 :4
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