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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.
| 4401. |
Mention the names, molecular formulae and structures of first six saturated compounds of carbon and hydrogen. |
Answer» Solution :The names, MOLECULAR FORMULAE and structures of first six saturated COMPOUNDS of carbon and HYDROGEN are as follows :  
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| 4402. |
Mention the merits of Newlands' law of octaves. |
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Answer» Solution :i] The law WORKED WELL for elements with lower atomic masses. ii] It established the EXISTENCE of a relationship between the ORDER of atomic masses and repetition of properties of elements. |
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| 4403. |
Mention the mode of reproduction used by (a) Amoeba (b) Planaria |
| Answer» SOLUTION :a) AMOEBA is binary FISSION B) Planaria is regeneration | |
| 4405. |
Mention any four factors which inflyence the rate of transpiration in plants. |
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Answer» Solution :Transpiration is the process by which the excess of water is released by the PLANTS to the atmosphere. It happens with the help of guard cells. When the guard cells shrink the stomatal pores open and the excess water is released to the environment. * It HELPS the plants to keep COOL during hot conditions. *It helps plants to lose excess water. * As the excess water evaporates it indirectly helps us to get rain fall. * Through transpiration all the PARTS of the plants get water. * It helps the plants cells to be TURGID. |
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| 4406. |
Mention the general formula of unsaturated alkyne compounds. |
| Answer» SOLUTION :`C_(N)H_(2n-2)` | |
| 4407. |
Mention the formulae, names and physical states of the products in thereactions : K_2O(s) + H_2O(l) to |
| Answer» Solution :`UNDERSET("POTASSIUM hydroxide")(2KOH(aq))` | |
| 4408. |
Mention the formulae, names and physical states of the products in thereactions : ZnO(s) + C(s) to |
| Answer» SOLUTION :`UNDERSET("ZINC")(Zn(s)) +underset("carbon monoxide")(CO(G))` | |
| 4409. |
Mention the function of forebrain, cerebellum and medulla. |
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Answer» Solution :Forebrain : It is the major thinking PART of the brain. Hypothalamus part of diencephalon in the fore brain controls hunger, THIRST, fatigue, sleep, body temperature, sweating and emotions. Cerebellum: Precision of valuntary action such as walking in a straight line, riding a bicycle, picking up a PENCIL are possible because of cerebellum. MEDULLA : Involuntary action such as maintaining blood pressure, SALIVATION, vomiting are controlled by the medulla of the hind brain. |
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| 4410. |
Mention the formulae, names and physical states of the products in thereactions : Fe_2O_3(s) + 2Al(s) overset(Delta)(to) |
| Answer» Solution :`UNDERSET("Iron")(2FE(l)) + underset("aluminium oxide")(Al_2O_3(s) ) + ` HEAT | |
| 4411. |
Mention the formulae, names and physical states of the products in thereactions : Ca(s) + 2H_2O(l) to |
| Answer» SOLUTION :`UNDERSET("calcium hydroxide")(Ca(OH)_2(aq)) + underset("hydrogen")(H_2(G))` | |
| 4412. |
Mention the formulae, names and physical states of the products in thereactions : Cr_2O_3(s) +2Al(s) overset(Delta)(to) |
| Answer» Solution :`UNDERSET("CHROMIUM ")(2Cr(L)) + underset("ALUMINIUM oxide")(Al_2O_3(s)) + `HEAT | |
| 4413. |
Mention the formulae, names and physical states of the products in thereactions : Al_2O_3(s) + 6HCl(aq)to |
| Answer» Solution :`UNDERSET("ALUMINIUM CHLORIDE")(2AlCl_3(s)) + underset("water")(3H_2O(L))` | |
| 4414. |
Mention the formulae, names and physical states of the products in thereactions : CO(g) + H_2O(g) to |
| Answer» SOLUTION :`UNDERSET("CARBON dioxide")(CO_2(g)) + underset("Hydrogen")(H_2(g))` | |
| 4415. |
Mention the formulae, names and physical states of the products in thereactions : Al_2O_3(s) + 2NaOH(aq) to |
| Answer» SOLUTION :`UNDERSET("SODIUM ALUMINATE")(2NaAlO_2(s)) + underset("WATER")(H_2O)` | |
| 4416. |
Mention the formulae, names and physical states of the products in thereactions : 4Al (s) + 3O_2(g) to |
| Answer» SOLUTION :`UNDERSET("ALUMINIUM OXIDE")(2Al_2O_3(s))` | |
| 4417. |
Mention the formulae, names and physical states of the products in thereactions : 3NO_2(g) + H_2O(l) to |
| Answer» SOLUTION :`underset("NITRIC ACID")(2HNO_3(aq)) + underset("Nitric OXIDE")(NO(g))` | |
| 4418. |
Mention the formulae, names and physical states of the products in thereactions : 3Fe(s) + 4H_2O(g) to |
| Answer» SOLUTION :`underset("Ferroso FERRIC oxide")(Fe_3O_4(s)) + underset("HYDROGEN")(4H_2(G)) ` | |
| 4419. |
Mention the formulae, names and physical states of the products in thereactions : 2PbS(s) + 3O_2(g) to |
| Answer» Solution :`UNDERSET("Lead oxide")(2PbO(s)) + underset("SULPHUR DIOXIDE")(2SO_2(g))` | |
| 4420. |
Mention the formulae, names and physical states of the products in thereactions : 2HgS(s) + 3O_2(g) overset(Delta)(to) |
| Answer» SOLUTION :`UNDERSET("mercuric oxide")(2HgO(s)) + underset("sulphur DIOXIDE")(2SO_2(G))` | |
| 4421. |
Mention the formulae, names and physical states of the products in thereactions :2Cu(s) + O_2(g) to |
| Answer» SOLUTION :`UNDERSET("COPPER OXIDE")(2CuO(s))` | |
| 4422. |
Mention the formulae, names and physical states of the products in thereactions : 2Cu_2O(s) + Cu_2S(s) overset(Delta)(to) |
| Answer» SOLUTION :`UNDERSET("COPPER")(6Cu(s)) + underset("sulphur DIOXIDE")(SO_2(G))` | |
| 4423. |
Mention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of saponification reaction. |
| Answer» Solution :The essential materials are EDIBLE oil (from animal or vegetable ORIGIN), caustic alkali (NaOH or KOH) and common salt. The reaction mixture in the saponification reaction is of ALKALINE nature since it contains in it a caustic alkali. The nature can be tested by adding a few drops of red litmus to the mixture. Its colour will change to blue. | |
| 4424. |
Mention the drawbacks of Mendeleev's periodic table. |
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Answer» POSITION of hydrogen |
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| 4425. |
Mention the disadvantages of detergents. |
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Answer» Solution :1. Some detergents having a branched hydrocarbon CHAIN are not fully BIODEGRADABLE by micro-organisms present in WATER. So, they CAUSE water pollution. 2. They are relatively more expensive than soap. |
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| 4426. |
Mention the difference between calcination and roasting. How these processes are used in the extraction of zinc? Explain with the help of chemical equations. After these processes, is reduction necessary to obtain zinc ? Why ? |
Answer» Solution : Calcination : Carbonate ORE when heated STRONGLY in the absence of air is CONVERTED into metal oxide. ` ZnCO_(3) overset("HEAT")(rarr)ZnO + CO_(2)` Roasting : Sulphide ore is strongly heated in the presence of air and is converted into metal oxide. ` 2 ZnS + 3O_(2) overset(Delta)(rarr) 2 ZnO + 2SO_(2)` Yes, reduction is necessary after these proc=c,es to reduce the oxides to their metals. `ZnO + C rarr Zn + CO ` |
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| 4427. |
Mention the common name given to the following elements : Boron, Silicon, Germanium, Arsenic, Antimony. State one property that justifies their name. |
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Answer» Solution :They are CALLED metalloids. They SHOW the PROPERTIES of METALS as well as non-metals. |
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| 4428. |
Mention the colour of FeSO_(4). 7H_(2)O crystals . How does this colour change upon heating ? Give balanced chemical equationfor the change. |
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Answer» SOLUTION :Light green is the colour of crystalline `FeSO_(4).7H_(2)O`. Light green changes to REDDISH BROWN or brown upon heating . (i) `FeSO_(4).7H_(2)O overset Delta rarr FeSO_(4)+7H_(2)O` (ii) `2FeSO_(4) overset "Heat" rarr Fe_(2)O_(3)+SO_(2)+SO_(3)` |
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| 4429. |
Mention the colour changes observed when the following indicators are added to acids : Alkaline phenolphthalein solution |
| Answer» SOLUTION :PINK to COLOURLESS | |
| 4430. |
Mention the colour changes observed when the following indicators are added to acids: Methyl orange solution |
| Answer» SOLUTION :YELLOW to RED | |
| 4431. |
Mention one use of quick lime. |
| Answer» SOLUTION :In MANUFACTURE of CEMENT | |
| 4432. |
Mention one advantage of recycling of waster materials . |
| Answer» SOLUTION :it SAVES NATURAL resources so that their sustainability is maintained | |
| 4433. |
Mention any two trends exhibited by elements when we go from left to right across the period of periodic table. |
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Answer» SOLUTION :(i) ATOMIC radius DECREASES. (II) Metallic character decreases. |
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| 4434. |
Mention any two demerits of the long form of the periodic table. |
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Answer» Solution :I] The position of hydrogen is not clear though it is PLACED with ALKALI METALS. ii] Lanthanides and actinides are placed separately and can.t be INCLUDED with other elements in the main portion of the periodic table. |
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| 4435. |
Mention any four phenomena that can be observed due to atmospheric refraction of light on the earth. |
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Answer» Solution :(i) The sun is visible to US two minutes before the ACTUAL sunrise. (II) The sun is visible to us two minutes after the actual sunset also. (iii) The APPARENT position of the star is slightly different from its actual position. (iv) TWINKLING of star (v) Formation of rainbow (vi) The apparent random wavering of flickering of objects seen through a turblulent strea of hot air rising above a fire or a radiator. |
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| 4436. |
Mention a reaction , other that the mentioned in the above experiment , which can be carried out of verify the law of conservation of mass. |
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Answer» Solution :The combination REACTION between iron and sulphur also verifies the LAW. `underset( "iron")FE + underset(" Sulphur")S to underset(" ferrous sulphide" ) FeS` |
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| 4437. |
Mendeleev's periodic table : Atomic mass :: Moseley modern table : ___________ |
| Answer» SOLUTION :ATOMIC NUMBER | |
| 4438. |
Mendeleev's Periodic Table: Atomic mass::Modern Periodic table : _________ |
| Answer» Solution :Atomic number - Atomic mass is the BASIS for MENDELEEV. s period ic TABL e whereas TH eatomicnumber is the basis for Modem Periodic Table. | |
| 4440. |
Mendeleev's Periodic Law was modified and ____ was adopted as the basis of Modem Periodic Table. |
| Answer» SOLUTION :ATOMIC NUMBER | |
| 4442. |
State Mendeleev's period law. |
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Answer» Solution :(i)The Russian scientist Dmitri Mendeleev developed the periodic table of elements during the period 1869 to 1872 A.D. (ii) Mendeleev.s periodic table is the most important STEP in the classification of elements. (iii) Mendeleev considered the fundamental property of elements, namely the atomic mass as standard and arranged 63 elements known at that TIME in an increasing order of their atomic masses. (iv) Then, he transferred this into the periodic table of elements in accordance with the physical and chemical properties of these elements. (V) He organized the periodic table on the basis of the chemical and physical properties of the elements. (vi) These were the molecular formulae of HYDRIDES and oxides of the elements, melting points, boiling points and densities of the elements and their hydrides and oxides. (vii) Mendeleev found that the elements with similar physical and chemical properties repeat after a definite interval. (viii) On the basis of this finding, Mendeleev, stated the FOLLOWING periodic law "Properties of elements are periodic function of their atomic masses". |
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| 4443. |
Mendeleev's Periodic law: |
| Answer» Solution :Mendeleev.s PERIODIC LAW states that "PROPERTIES of elements are periodic function of their ATOMIC masses." | |
| 4444. |
Mendeleev treated the hydrides and oxides of element as the basic properties of elements for their classification. |
| Answer» SOLUTION :During the time when Mendeleev gave his periodic table, ATOMIC numbers and electronic configurations were not known. Comparison of PROPERTIES of elements could be best done by comparing their compounds. He selected oxides and HYDRIDES because oxygen and hydrogen form compounds with most of the elements due to their high reactivity. | |
| 4445. |
Mendeleev predicted the existence of certain elements not known at that time and named two ofthem as Eka-silicon and Eka-aluminium. (a) Name the elements which have taken the place of these elements, (b) Mention the Group and the Period of these elements in the Modern Periodic Table. (c) Classify these elements as metals, non-metals or metalloids. (d) How many valence electrons are present in each one of them? |
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Answer» Solution : (a) GERMANIUM (Ge) and GALLIUM (GA) (b)GROUP 14, Period 4 and Group 13, Period 4 (c) Ge - Metalloid, Ga - Metal (d) Ga -3, Ge- 4 |
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| 4446. |
Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. a] Name the elements which have taken the place of these elements. b] Mention the group and the period of these elements in the Modern Periodic Table. c] Classify these elements as metals, non-metals, or metalloids. d] How many valence electrons are present in each? |
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Answer» Solution :a] Eka-silicon was later identified as Germanium (Ge) and Eka- aluminium was NAMED as Gallium (Ga) b] Germanium (Ge) - GROUP 14, PERIOD 4, Gallium (Ga) - Group 13, period 4. c] Gallium (Ga) is a metal while Germanium (Ge) is a METALLOID. Gallium is placed in the 13th group: so there must be 13 - 10 = 3 valence electrons. Similarly germanium is placed in group 14: so there must be 14 - 10 = 4 valence electrons. |
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| 4447. |
Mendeleev named scandium as ………… |
| Answer» SOLUTION :eka-boron | |
| 4449. |
Mendeleev left some gaps in his periodic table. |
| Answer» SOLUTION :Mendeleev left gaps in his periodic table to keep the elements with similar properties TOGETHER. He predicted that NEW elements would be discovered later and they would occupy those gaps. | |
| 4450. |
Mendeleev classified the elements on the basis of two factors. What were these two factors? |
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Answer» Solution :(i) Atomic MASS. (II) Physical and chemical PROPERTIES. |
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