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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 3952. |
Following statement is true or false ?Nitrogen forms five oxides. It proves the law of multiple proportions. |
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Answer» |
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| 3953. |
Nitrogen dioxide gas dissociates to give nitric oxide and oxygen. For this reaction, when a graph is ploted between concentration of NO_(2) and time, the slope of tangent drawnat time t=10 s is found to be 6.8xx 10^(-4) mol L^(-1) s^(-1) .predict the slope of the graph at t=10s when the concentration of NO and O_(2) are plotted against time. Justify your answer. |
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Answer» SOLUTION :(i) The RATE of reaction in terms of reactants can be determined if thebalanced EQUATION is known (II) balanced equation (iii) rate of reaction in terms of `NO, NO_(2) and O_(2)` (iv) `3.4xx10^(-4) "mol "L^(-1) s` |
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| 3954. |
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why? |
Answer» Solution :The ELECTRONIC configuration of nitrogen and phosphorus are as follows:  Nitrogen is more electronegative than phosphorus because electronegative character DECREASES on moving down a GROUP. |
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| 3955. |
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of thePeriodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why? |
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Answer» SOLUTION : (a) NITROGEN (N) - At. No. = 7, ELECTRONIC configuration = 2,5. (b)Phosphorous (P) - At. No = 15, Electronic configuration = 2, 8,5. Thus, nitrogen will be more electronegative because its atom has SMALL size due to which theattraction of its NUCLEUS for the incoming electron is more. |
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| 3956. |
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to Group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative ? Why ? |
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Answer» SOLUTION :Nitrogen with atomic NUMBER 7 has got 7 electrons with electronic configuration 2, 5 i.e., 2 electrons in K-shell and 5 electrons in L-shell. Phosphorus with atomic number 15 has got 15 electrons with electronic configuration 2, 8, 5 i.e., 2 electrons in K-shell, 8 electrons in L-shell and 5 electrons in M-shell. Non-metallic character decreases as we MOVE down the group. THEREFORE, nitrogen will be more ELECTRONEGATIVE than phosphorus. |
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| 3957. |
Nitrogen (atomic no. 7) and phosphorous (atomic no. 15) belong to group 15 of the PeriodicTable. Write the electronic configuration of these two elements in terms of K, L, M, N shell. Predict whether these are metallic or non-metallic |
Answer» SOLUTION : Both are non-metals as they TEND to FORM BONDS by gaining electrons. |
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| 3958. |
Nitrogen (atomic number 7) and phosphorous (atomic number 15) belong to group 15 of the periodic table. Write the electron configurations of these two elements. Which of these is more electronegative? |
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Answer» SOLUTION :Nitrogen (7): 2,5 Phosphorous (15): 2, 8, 5 Since,electronegativitydecreases withmovingfrom TOPTO bottom in a group thus nitrogen will be more electronegative. |
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| 3959. |
Nitrogen and oxygen are …………. Molecules wheres Helium and Neon are …………… molecules. |
| Answer» SOLUTION :DIATOMIC, MONOATOMIC | |
| 3960. |
Nitro glycerine is used as a explosive. The equation for the explosive reaction is underset((l))(4C_(3)H_(5)((NO_(3)))_(3))rarr underset((g))(12CO_(2))+underset((l))(10H_(2)O)+underset((g))(6N_(2))+underset((g))(O_(2)) ("Atomic mass of C = 12, H = 1, N = 14, O = 16") (i) How many moles does the equation show for (a) Nitroglycerine (b) gas molecules produced? (ii) How many moles of gas molecules are obtained from 1 mole of nitroglycerine? (iii) What is the mass of 1 mole of nitroglycerine? |
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Answer» Solution :(i) 4 moles of Nitroglycerine (II) 4 moles of Nitroglycerine produce 19 moles of gas molecules `THEREFORE"1 mole of Nitroglycerine produces "19//4="4.75 moles"` (iii) Mass of 1 mole of Nitroglycerine `C_(3)H_(5)(No_(3))_(3)` `{:("Atomic mass of C ",=, 12),("Atomic mass of 3(C )"=3xx12,=,36),("Atomic mass of 5(H)"=5xx1,=,5),("Atomic mass of 3(N)"=3xx14,=,42),("Atomic mass of 9(O)"=9xx16,=,144),(,,""ulbar("227g")):}` Mass of 1 mole of Nitroglycerine = 227g |
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| 3961. |
Nitric oxide can catalyse ozone formation in troposhere . Justify. |
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Answer» Solution :Nitric oxide (NO) in the tropsphere reacts with the oxygen forming nitrogen dioxide: `2NO + O_(2) to 2NO_(2)` Nitrogen dioxide, in the PRESENCE of light, DECOMPOSES to NO and NASCENT oxygen: `NO_(2) overset("light")to NO + [O]` The nascent oxygen produced is highly REACTIVE and oxiddies oxygen to ozone: `O_(2) +[O] to O_(3)` |
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| 3962. |
NH_(4)OH , NaOH, CH_(3)COOH , H_(2)S |
| Answer» Solution :NAOH is odd one because it is a strong electrolyte , whereas the OTHERS are weak ELECTROLYTES . | |
| 3963. |
NH_(3),H_(2)O are ………….molecules wheres N_(2),O_(2) are ……………….molecules. |
| Answer» SOLUTION :Heteroatomic, HOMOATOMIC | |
| 3964. |
NH_(3)gas can be prepared by Haber’s process as, N_(2)(g) + 3H_(2) (g)rarr 2NH_(3)(g). At a particular moment concentration of all the species is2 moles,calculate the concentration of N_(2) and H_(2) taken initially |
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| 3965. |
Next higher homologue of formaldehyde has the formula |
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Answer» HCOOH |
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| 3966. |
Newlands' law of octaves was found to be applicable upto .......... |
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Answer» nickel |
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| 3968. |
Newlands' law of octaves could not classify all the elements known at that time. |
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Answer» SOLUTION :Newlands. law of octaves was applicable upto calcium. After calcium, every eighth element did not possess properties similar to that of the first element. Newlands. assumed that only 56 elements EXISTED in NATURE. Newlands. law of octaves was found CORRECT only to lighter elements. THUS, all the elements could not be classified by the Newlands law of octaves. |
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| 3969. |
Newlands could arrange elements upto __________ out of total 56 elements known. |
| Answer» SOLUTION :CALCIUM (CA) | |
| 3970. |
Newlands' Law of Octaves: |
| Answer» Solution :Newlands. Law of OCTAVES states that "When the elements are ARRANGED in an increasing order of their atomic MASSES, the properties of every eighth ELEMENT are SIMILAR to those of the first." | |
| 3971. |
Neopentane and Isopentane are |
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Answer» allotropes  `underset("Pentane")(H - underset(H ) underset(|)overset(H) overset(|)C-underset(H ) underset(|)overset(H) overset(|)C-underset(H ) underset(|)overset(H) overset(|)C-underset(H ) underset(|)overset(H) overset(|)C-underset(H ) underset(|)overset(H) overset(|)C-H)` |
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| 3972. |
Neon shows zero electron affinity due to …………. |
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Answer» stable ARRANGEMENT of neutrons |
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| 3973. |
Negative sign in the standard electrode potential indicates |
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Answer» GREATER ease of OXIDATION compared to that of hydrogen |
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| 3974. |
Natural resources should be used____ |
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Answer» |
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| 3975. |
NARMADA BACHAO ANDOLAN |
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Answer» Ravi Shankar MAHARAJ |
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| 3976. |
Name two compounds which sublime on heating. |
| Answer» SOLUTION :CAMPHOR and NAPHTHALENE. | |
| 3977. |
Name two solid metals and two solid non-metals along with their symbols. |
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Answer» Solution :Two SOLIDS metals are : (i) COPPER (Cu) (ii) SODIUM (Na) Two solid non-metals are : (i) IODINE (I) (ii) Silicon (Si) |
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| 3979. |
Name two national parks in India. |
| Answer» Solution :GREAT Himalayan National park in HARYANA and (II) Karera National Park in MADHYA Pradesh | |
| 3980. |
Name two metals which will displace hydrogen from dilute acids and two metals which will not. |
| Answer» Solution :Two metals which DISPLACE hydrogen from DILUTE acids are: (i) zinc (Zn) and (ii) aluminium (Al). Two metals which cannot displace hydrogen from dilute acids are: (i) copper (Cu) and (ii) MERCURY (Hg). | |
| 3981. |
Name two metals which will displace hydrogen from dilute acids, and two metals which willnot. |
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Answer» Solution :MAGNESIUM and ZINC metals DISPLACE hydrogen from dilute acids. Copper and SILVER do not displace hydrogen from dilute acids. |
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| 3982. |
Name two metals, which will displace hydrogen from dilute acids and two metals, which will not. |
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Answer» SOLUTION :(i) Magnesium and zinc will displace HYDROGEN from dilute acids. (II) Copper and silver will not displace hydrogen from dilute acids. |
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| 3983. |
Name two metals which react violently with cold water, Write any observation you would make when such a metal is dropped into water. How would you identify the gas evolved, if any, during the reactions? |
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Answer» Solution :Metals which react VIOLENTLY with cold water are potassium (k) and sodium (Na). `2K+2H_2O to 2KOH +H_2+ Heat energy` `2Na+2H_2O to 2NaOH+H_2+ Heat energy` The HYDROGEN gas produced during the reactions of these two metals with water immediately CATCHES fire. Thus, these reactions are VIOLENT and EXOTHERMIC. THe gas evolved during these reactions burns with a popping sound which confirms that the gas is hydrogen `(H_2)`. |
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| 3984. |
Name two metals which react violently with cold water. Write any three observations which youwould make when such a metal is dropped into water. How would you identify the gas evolved,if any, during the reaction ? |
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Answer» Solution :Sodium and potassium metals react violently with cold water.Three observations that we make are : (i) The metal floats on the surface of water. (ii) The REACTION is exothermic. (iii) Hydrogen gas evolved catches fire. To identify the gas evolved, we PASS the gas through soap solution. Soap bubbles are formed which RISE up. When a burning CANDLE is brought near the bubbles, hydrogen gas burns with a .pop. SOUND. |
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| 3985. |
Name two metals which will displace hydrogen from dilute acids, and two metals which will not. |
| Answer» SOLUTION :Iron and ALUMINIUM will displace hydrogen from DILUTE ACID is as they are more reactive then hydrogen. Mercury and Copper cannot displace hydrogen from dilute acid is they are LESS reactive than hydrogen. | |
| 3986. |
Name two metals which occur in native state in nature |
| Answer» SOLUTION :GOLD (AU) and SILVER (AG) | |
| 3987. |
Name two metals which melt even when placed on plam. |
| Answer» SOLUTION :GALLIUM (GA) and CAESIUM (CS) | |
| 3988. |
Name two metals which do not liberate hydrogen from acids. |
| Answer» SOLUTION :COPPER and SILVER. | |
| 3990. |
Name two metals which do not correct easily . Give an example in each of the following case to support that : (i) Corrosion of some metals is an advantage. (ii) Corrosion of a metal is a serious problem . |
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Answer» Solution :Gold and PLATINUM. (i) Corrosion of aluminium is useful . A PROTECTIVE layer of aluminium oxide is FORMED on the surface of the METAL which renders the ,etal passive and presents it from further corrosion . (ii) Corrosion of iorn is serious PROBLEM. Every yearlarge amount of money is spent to replace damaged iron and steel structures. Here corrosion is a serious problem. |
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| 3991. |
Name two metals which displace hydrogen from dilute HCI and two metals which do not . |
| Answer» Solution :Magnesium (MG) and ZINC (Zn) DISPLACE HYDROGEN FORM dilute HCI, but aluminium (Al) and copper (Cu) do not. | |
| 3992. |
Name two metals which displace hydrogen from dilute acid and name two metals which cannot displace hydrogen from dilute acids. |
| Answer» Solution :Two metals which DISPLACE hydrogen from dilute acids are: (i) zinc (ZN) and (ii) aluminium (Al). Two metals which cannot displace hydrogen from dilute acids are: (i) COPPER (Cu) and (ii) mercury (HG). | |
| 3995. |
Name two metals, which are found in nature in the free state. |
| Answer» SOLUTION :GOLD and silver are LEAST reactive and HENCE these metals OCCUR in nature in the free state. | |
| 3996. |
Name two metals which are found in nature in the free state. |
| Answer» SOLUTION :GOLD and PLATINUM. | |
| 3997. |
Name two metals which are obtained by the electrolysis of their molten chlorides. |
| Answer» SOLUTION :SODIUM and CALCIUM | |
| 3998. |
Name two metals which are found in nature in a free state. |
| Answer» SOLUTION :GOLD and PLATINUM. | |
| 4000. |
Name two metals that react with both HCI and NaOH to produce H_(2) has. |
| Answer» SOLUTION :ZINC and ALUMINIUM. | |