Description : Lagoons used for purification of polluted water (A) Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds (B) Use micro-organisms/bacteria in presence of dissolved oxygen (C) Gives an ... 1 mg/litre and BOD = 3.8 mg/litre (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : `A={1, 2, 3, ..., 9}`. If three numbers are selected from set A and are arranged, the probability that three numbers are either in increasing order or
Last Answer : `A={1, 2, 3, ..., 9}`. If three numbers are selected from set A and are arranged, the probability that three numbers ... ` B. `2/3` C. `1/2` D. `1/3`
Description : Which one of the following lists four type of coal, arranged in the increasing order of their carbon content? (a) Peat, Lignite, Bituminous, Anthracite (b) Peat, Bituminous, Lignite, Anthracite (c) Lignite, Peat, Bituminous, Anthracite (d) Peat, Anthracite, Lignite, Bituminous
Last Answer : Ans: (a)
Description : Lights of different colours are arranged below in order of increasing wavelengths: 1. Violet, indigo, blue 2. Green, orange, red 3. Red, green, indigo 4. Blue, green, yellow Which of the above are in proper sequence? (a) 1 only (b) 1 and 2 (c) 2 and 3 (d) 1 and 4
Last Answer : Ans:(d)
Description : In 1866, John Newlands, an English scientist, arranged the then known elements in the order of increasing atomic masses. He found that every eighth element had properties similar to that of the first. He called it ... of Pentamates (2) Law of musical notes (3) Law of Octaves (4) None of the above
Last Answer : (3) Law of Octaves Explanation: Newlands compared his discovery to the octaves found in music and thus, he called it the ‘Law of Octaves’. It is also known as ‘Newlands’ Law of Octaves’.
Description : The reactivity series is a list of metals arranged in order of A) Increasing reactivity B) Decreasing reactivity C) Increasing and decreasing reactivity D) None of the above
Last Answer : B) Decreasing reactivity
Description : Law of octaves says that if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of elements
Last Answer : 7
Description : Assertion :- Oxidation number of `S` in `HSO_(3)^(-)` is `+4`. Reason :- Sulphur is in different oxidation state in different compounds.
Last Answer : Assertion :- Oxidation number of `S` in `HSO_(3)^(-)` is `+4`. Reason :- Sulphur is in ... Reason is False. D. If both Assertion & Reason are False.
Description : In which of the following the oxidation number of oxygen has been arrangd in increasing order :-
Last Answer : In which of the following the oxidation number of oxygen has been arrangd in increasing order :- A. `OF_(2) lt ... ) lt OF_(2) lt O_(3) lt BaO_(2)`
Description : In which of the following compounds of Cr, the oxidation number Cr is not `+6` :-
Last Answer : In which of the following compounds of Cr, the oxidation number Cr is not `+6` :- A. `CrO_(3)` B. `CrO_(2)Cl_( ... `Cr_(2)O_(3)` D. `K_(2)Cr_(2)O_(7)`
Description : In which of the following compounds, the oxidation number of the started transition metal is zero.
Last Answer : In which of the following compounds, the oxidation number of the started transition metal is zero. A. `[Ni(CO)_(4)]` ... . `[Fe(H_(2)O)_(3)](OH)_(2)`
Description : In which one of the following compounds does sulphur have the least oxidation number
Last Answer : In which one of the following compounds does sulphur have the least oxidation number A. `SO_(2)` B. `H_(2)SO_(4)` ... (2)O_(3)` D. `Na_(2)S_(4)O_(6)`
Description : What are the minimum and maximum Oxidation Number of Cl in its compounds?
Last Answer : Ans. Minimum -0, maximum- +7.
Description : Stabilisation of gasoline (petrol) means (A) Removal of dissolved gases from it (B) Increasing its oxidation stability (C) Improving its lead susceptibility (D) Increasing its vapour pressure
Last Answer : (A) Removal of dissolved gases from it
Description : Give reason for the following observation (L-III) (a)- The tendency for catenation decreases down the group in group 14 (b)- The decreasing stability of+3 oxidation state with increasing atomic no. in group 13. (c)- Molten aluminum bromide is a poor conductor of electricity.
Last Answer : Ans. -(a) it is due to decrease in bond dissociation energy which is due to increase in atomic size C-C > Si-Si >Ge-Ge>Sn-Sn>Pb-Pb. (b)- It is due to inert pair effect. (c)- Molten AlBr3 is poor conductor of electricity because it is covalent compound.
Description : Conversion achieved in HNO3 synthesis with the use of platinum catalyst is about 95-97%. The rate of formation of nitrogen dioxide from the oxidation of nitric acid is favoured by (A) Decreasing the pressure (B) Decreasing the temperature (C) Increasing the temperature (D) None of these
Last Answer : (C) Increasing the temperature
Description : Which is an element which never exhibits positive oxidation state in any of its compounds? -Do You Know?
Last Answer : answer:
Description : In which of the following compounds, nitrogen exhibits highest oxidation state ?
Last Answer : In which of the following compounds, nitrogen exhibits highest oxidation state ? A. `N_(3)H` B. `NH_(2)OH` C. `N_(2)H_(4)` D. `NH_(3)`
Description : In which of the following compounds iron has lowest oxidation state?
Last Answer : In which of the following compounds iron has lowest oxidation state? A. `FeSO_(4)(NH_(4))_(2)SO_(4).6H_(2)O` B. ... ` C. `Fe(CO)_(5)` D. `Fe_(0.94)O`
Description : Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen ?
Last Answer : Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen ? A. `HNO_(3), ... `NO, HNO_(3), NH_(4)Cl, N_(2)`
Description : Which of the following elements react with metals to form their binary compounds exhibiting `-3` oxidation state ?
Last Answer : Which of the following elements react with metals to form their binary compounds exhibiting `-3` oxidation state ? A. N B. P C. As D. Bi
Description : The breakdown of the C-C bonds of complex compounds through oxidation within the cells, leading to release of considerable amount of energy is called.
Last Answer : The breakdown of the C-C bonds of complex compounds through oxidation within the cells, leading to release of considerable amount of energy is called.
Description : In which of the following compounds oxygen exhibits an Oxidation state of `+2`
Last Answer : In which of the following compounds oxygen exhibits an Oxidation state of `+2` A. `H_(2)O` B. `H_(2)O_(2)` C. `OF_(2)` D. `H_(2)SO_(4)`
Description : During each cycle of on going fatty acid oxidation, all the following compounds are generated except (A) H2O (B) Acetyl CoA (C) Fatty acyl CoA (D) NADH FATS AND FATTY ACID METABOLISM 103
Last Answer : Answer : A
Description : During each cycle of β-oxidation of fatty acid, all the following compounds are generated except (A) NADH (B) H2O (C) FAD (D) Acyl CoA
Last Answer : Answer : B
Description : Nitrogen forms a variety of compounds in all oxidation states ranging from - (1) -3 to + 5 (2) -3 to +3 (3) -3 to + 4 (4) -3 to +6
Last Answer : (1) -3 to + 5 Explanation: Nitrogen compounds are chemical compounds containing nitrogen ions. Nitrogen forms compounds with a wide range of oxidation states that range from -3 for the ... oxidation state compounds are strong oxidizing agents. -3 oxidation state compounds are weak reducing agents.
Description : Which is an element which never exhibits positive oxidation state in any of its compounds?
Last Answer : Fluorine
Description : Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere? (a) Aerobic nitrate oxidation and nitrite reduction (b) ... fixation by Rhizobium in root nodules of legumes (d) Anaerobic ammonium oxidation and denitrification
Last Answer : (d) Anaerobic ammonium oxidation and denitrification
Description : Organisms which obtain energy by the oxidation of reduced inorganic compounds are called (a) photoautotrophs (b) chemoautotrophs (c) saprozoic (d) coproheterotrophs.
Last Answer : (b) chemoautotrophs
Description : Oils are partially hydrogenated (not fully) to manufacture Vanaspati, because fully saturated solidified oils (A) Cause cholesterol build up and blood clotting (B) Are prone to rancid oxidation (C ... (as their complete removal is very difficult) (D) Have affinity to retain harmful sulphur compounds
Last Answer : (A) Cause cholesterol build up and blood clotting
Description : Nitrogen oxidation (nitrification)refers to the A- conversion of ammonium ions into nitrates through the activities of certain bacteria B- changing of atmospheric nitrogen (N2) to nitrogen compounds C- sulfur is oxidized to the sulfate form through Thiobacillusbacteria D- none of the above
Last Answer : conversion of ammonium ions into nitrates through the activities of certain bacteria
Description : The catalytic activity of transition metals and their compounds is ascribed mainly to (1) their chemical reactivity (2) their magnetic behaviour (3) their unfilled d-orbitals (4) their ability to adopt variable oxidation states
Last Answer : (4) their ability to adopt variable oxidation states
Description : In which of the following compounds, nitrogen exhibits highest oxidation state? (1) NH2OH (2) N2H4 (3) NH3 (4) N3H
Last Answer : N3H
Description : Nitrogen forms a variety of compounds in all oxidation states ranging from (1) –3 to + 5 (2) –3 to + 3 (3) –3 to + 4 (4) –3 to + 6
Last Answer : –3 to + 5
Description : Give the correct order of the increasing acidic strength of the following compounds :
Last Answer : Give the correct order of the increasing acidic strength of the following compounds : A. `II lt I lt III` B. ` ... lt III lt I` D. `I lt II lt III`
Description : Arrange the following compounds in order of increasing molar conductivity . `(i) K[Co(NH_(3))_(2)(NO_(2))_(4)]" " (ii) [Cr(NH_(3))_(3)(NO_(2))_(3)]` `
Last Answer : Arrange the following compounds in order of increasing molar conductivity . `(i) K[Co(NH_(3))_(2)(NO_(2))_(4)]" ... )" " (iv) [Cr(NH_(3))_(6)]Cl_(3)`
Description : Which is the increasing order of acidic strength in the following compounds ? `CH_(3)CH_(2)CH_(2)COOH(I), "NCCH"_(2)COOH(II), H_(2)C=CHCH_(2)COOH(III)
Last Answer : Which is the increasing order of acidic strength in the following compounds ? `CH_(3)CH_(2)CH_(2) ... B. `IltIIIltII` C. `IIIltIIltI` D. `IIltIltIII`
Description : Arrange the following carboxyl compounds in increasing order of their reactivity in nucleophilic addition reactions. Explain with proper reasoning : Benzaldehyde. p-tolualdeyde, p-nitrobenzaldehyde, Acetophenone.
Last Answer : Ans. Acetophenone is a ketone while all others are aldehydes, therefore it is least reactive. In p-tolualdehyde, there is methyl group (CH3 ) at para position w.r.t. to the ... overall order of increasing reactivity : acetophenone < p-tolualdehyde < benzaldehyde < p-nitrobenzaldehyde.
Description : Arrange the following compounds in increasing order of their acid strength. Benzoic acid, 4-Nitrobenzoic acid, 3, 4-dinitrobenzoic acid, 4-methoxy benzoic acid.
Last Answer : Since electron donating gps. decrease the acid strength therefore 4-methoxybenzoic acid is a weaker acid because methoxy sp. is E. D. G. than benzoic acid. Further since electron withdrawing gps. increase ... : 4-methoxybenzoic acid < benzoic acid < 4-nitrobenzoic acid < 3, 4, dinitrobenzoic acid.
Description : Consider the three isomeric alkanes n-hexane, 2,3-dimethylbutane, and 2- methylpentane. Which of the following correctly lists these compounds in order of increasing boiling point? (a) 2,3-dimethylbutane < 2- ... < 2, 3-dimethylbutane < n-hexane (d) n-hexane < 2-methylpentane < 2,3-dimethylbutane
Last Answer : 2,3-dimethylbutane < 2-methylpentane < n-hexane
Description : Which of the following statement(s) is/are true concerning cellular ion channels? a. Ion channels are transmembrane proteins that form pores that can conduct ions across the plasma membrane b. ... undergo conformational changes between open states and closed states d. Ion channels can be blocked
Last Answer : Answer: a, b, c, d Ion channels are transmembrane proteins that form pores that can conduct ions across the plasma membrane. Ion channels are formed by membrane-spanning peptides that are arranged ... be blocked by ions or organic compounds that enter the channel, bind there, and occlude the pore
Description : A characteristic feature of a muscle fibre is the presence of large number of parallel arranged filaments in the sarcoplasm called_____
Last Answer : A characteristic feature of a muscle fibre is the presence of large number of parallel arranged filaments in the sarcoplasm called_____
Description : An AC circuit has capacitance arranged in series. If the line voltage remains constant, the capacitive reactance value can be varied by changing the _____________. A. line frequency B. resistance C. number of commutating poles D. number of interpoles
Last Answer : Answer: A
Description : Six persons Amit , Balu, Chetan, Daya, Jay and Ravi are arranged in a row and occupations are Teacher, Doctor, Lawyer, Police, Driver and Engineer respectively. I. A is an engineer placed at one of the ends II. ... and Doctor. Who is the only person between Doctor and Teacher? a)C b) D c)B d) F
Last Answer : Ans: option (b)