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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.
| 1652. |
1. Identify the following types of reactions and define thesame4K+O2---->2K20Hcl + NaOH----->NaCl +H20 |
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Answer» Answer: 1. oxidation REACTION ( REDOX reaction) 2. Displacement reaction oxidation reaction means the reaction in which oxygen is added. displacement reaction means the reaction in which EXCHANGE of IONS take place. |
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| 1653. |
Write the chemical formula of the following compounds.1.Calcium oxide2.Sodium bromide3.Potassium nitrate |
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Answer» Answer: This is the STANDARD form of LINEAR EQUATIONS in two variables: ... How do i write the equation of a LINE in standard form when i am GIVEN a ... |
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| 1654. |
11. Most metals are extracted from their _____ ? |
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Answer» Most metals are extracted from ores FOUND in the EARTH's crust. Ores are often METAL oxides , although sulfide and carbonate ores are also common. hope it's help you and Mark me as brainliest answer |
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| 1655. |
What do you by classification of elements? why should it be done? |
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Answer» Grouping of elements into different classes is called periodic CLASSIFICATION of elements. This METHOD is requires arranging the elements that are alike and separating the elements that are unlike. It HELPS us understand how different elements FORM different compounds |
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| 1656. |
Method to separate sawdust from a mixture sawdust and salt |
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Answer» Answer: To separate salt, sawdust and IRON, use a magnet to separate the iron. Then, add water to dissolve the salt and FLOAT the sawdust. Skim off, sieve or filter the solution to separate the sawdust. Let the water EVAPORATE, LEAVING the salt behind. |
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| 1658. |
Plz asnwer it fast... no irrevelent answers m. or else will be reported.. |
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Answer» Explanation: a ) CO + O2= CO2 b ) 2HgO+180kJ⟶2Hg+O2 c ) ZN + O2 = ZnO d ) H2O2 -> O2 + h2o = 2h2o2-> O2 + 2h2o e ) MgO+H2O→Mg(OH)2 |
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| 1659. |
Please try solving dis !!! |
Answer» DIASTEREOMERS MAY be............ |
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| 1660. |
Copper cannot displace iron from iron sulphate solution because copper is _____ reactive than iron ? fill inthe blank space |
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Answer» Answer: Explanation: COPPER is WAY less REACTIVE than Fe good evening |
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| 1661. |
2......... cylinders are carried bymountaineers at higher altitude. |
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Answer» Answer: Mountaineers carry an oxygen CYLINDER along with them. It is because when they climb mountains, as altitude increases, the amount of oxygen level in the atmospheric AIR DECREASES as trees are not found at higher altitudes. As a result, mountaineers suffer from DIZZINESS. It can also lead to hypoxia. Explanation: hope you appreciate this ANS |
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| 1662. |
Name five chemical changes that take place in our Body. |
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Answer» Answer: ANABOLIC reaction. ... Exergonic Reaction. ... ISOMERIZATION reaction. ... Catalyst CHEMICAL Reaction. Catabolic Reaction. Reactions LIKE these are exothermic in nature, which breaks down complex molecules into smaller units of energy. ... |
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| 1663. |
Who ever answer this question l will follow and mark as Brainliest |
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Answer» Answer: 4. CONVEX, concave 5. LAGOONS |
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| 1664. |
A hectahydrate salt contains iron |
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Answer» true Explanation: PLS FOLLOW me PLSSSSSSSS |
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| 1665. |
Write true or false (i) in double displacement reaction, twocompounds in their aqueous solutionreact by exchanging their radicals. |
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Answer» false please make a brainlist answer PLZZ |
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| 1666. |
How cu is extracted from its ore |
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Answer» by separating them Explanation: |
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| 1667. |
Give me the answer and follow me |
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Answer» FIRST MARK me as a BRAINLIEST |
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| 1668. |
Write true or false for following statements (ii) in metal reactivity series, aluminium isthe most reactive metal _____ |
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Answer» False. Caesium is the most REACTIVE METAL in the REACTIVITY series. Hope it HELPS... Have a Wonderful Day Pls MARK as brainliest.. |
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| 1669. |
The process involving hydrogen used in the manufacture of vegetable fat occulotionThe wype of oxide formed by the element in period 3 and group 13 [IA] A10the valency of calcium in calcium nitride.Incement other than hydrogen and chlorine which exists in the isotopic form.which evolves reddish houn |
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Answer» Answer: Explanation: The PROCESS involving HYDROGEN used in the manufacture of vegetable fat occulotion The wype of oxide formed by the element in period 3 and group 13 [IA] A10 the valency of calcium in calcium nitride. Incement other than hydrogen and chlorine which EXISTS in the isotopic form. which evolves reddish houn |
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| 1670. |
Medicine that are applied to the skin to reduce the possibility of infection are called ................. |
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Answer» MEDICINE that are applied to the skin to reduce the possibility of infection are CALLED antiseptics |
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| 1671. |
B. Write "true" or "false" for the followingstatements(a) When a single compounddecomposes into two or more newsubstances by the action of energyis called decomposition reaction.(b) In melal reactivityseries, aluminium isthe most reactive metal(c) In double displacement reaction, twocompounds in their aqueous solutionreact by exchanging their radicals. |
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Answer» (a) true (B) false (C) true |
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| 1672. |
Out of 12000 books published by |
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Answer» MARK me BRILLIANT and place PLECE plec place plece plec place plece plec place plece plec place |
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| 1673. |
Ii) When a piece of glowing _______is taken into the cylinder of oxygen, itburns brightly producing sparkles anda crackling sound [coal/charcoal] |
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| 1674. |
(i) There must be release or absorptionof _______during a chemicalreaction[heat/energy] |
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Answer» there must be RELEASE or ABSORPTION of HEAT during a chemical reaction |
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| 1675. |
Sate the diference between neutral, acidic and basic salts. Game one example |
Answer» PLEASE MARK as BRAINLIEST please |
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| 1676. |
(｡♡‿♡｡)please try solving dis !!! |
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Answer» Answer: OPTION 1) is your right answer. Please Mark as BRANLIEST. |
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| 1677. |
- Why is distilled water not recommended aspotable water? |
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Answer» Since DISTILLED WATER doesn't CONTAIN its own minerals, it has a tendency to pull them from whatever it touches to MAINTAIN a balance. So when you drink distilled water, it may pull small amounts of minerals from your body, including from your teeth |
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| 1678. |
Give one word or a phrase for the following statements1. A polyatomic ion with one unit positive change2. A representation of a molecule of an element or compound3. The charged porticles formed when an atom (or a group of atoms) gains or loses electrons4. A chemical substance that citers the chemical reochon without itself undergoing anychemical change5. A chemical reaction indocted by two half crowheads pointing in oooosite direchons |
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Answer» HELIUM 2,1 |
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| 1679. |
· State five qualities of potable water. |
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Answer» Answer: Potable water MUST be free from disease-causing bacteria. ... it should be colourless and odourless. it should be transparent. it should be free from harmful MICRO organisms. it should be free from SUSPENDED impurities. it should contain some minerals and salts, necessary for our BODY and some DISSOLVED gases to add taste. |
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| 1680. |
Coal and petroleum table 1 in chemistry |
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Answer» Explanation: Coal and PETROLEUM are FORMED as a result of degradation of ancient plant life which lived millions of years ago. Over time, heat and pressure from GEOLOGICAL processes transformed these materials into coal. ... SINCE these are formed from essentially fossils, they are also known as FOSSIL fuels. FOLLOW ME |
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| 1681. |
What is the maximum percentage of the saltwhich is found in seawater? |
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| 1682. |
Differences between Dalton atomic theory and modern atomic theory? |
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Answer» Dalton's says atoms of different elements differ in size and mass, whereas the modern THEORY says they differ in average mass. Dalton's says atoms are indivisible PARTICLES, whereas the modern theory says atoms are DIVISIBLE into sub-atomic particles like protons, neutrons, and electrons. |
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| 1683. |
. Changes involve energy. Explain it. |
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Answer» Hope it HELPS you Explanation: an alteration in the physical and chemical properties of matter DUE to the effect of some kind of energy. E.g. Here ICE get energy from the surroundings and get converted into water. means here energy is involved in changing the state of ice to liquid. |
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| 1684. |
Name (a) three dissolved impurities and(b) three suspended impurities present in theriver water. |
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Answer» PLS MARK me as BRAINLIEST and FOLLOW me |
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| 1685. |
Match the following:Column-A) ElectropositivityB) ElectronegativityC) MetalD) Non-metalColumn - II1) Arsenic2) Magnesium3) Carbon4) Tendency of losing electrons5) Gaining pair of electronsFolloid |
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Answer» A - 4 |
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| 1686. |
An element M from the following compounds with hydrogen, carbon and oxygen: H2M,CM2,MO2,MO3.State the three valencies of element M which are illustrated by these compounds (if u did not understand this question in top i had presented a photo so u can understand) |
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Answer» Answer: For H2M the VALENCY of M is -2. For CM2 the valency of M is 2. For MO2 the valency of M is 4. For MO3 the valency of M is 6.
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| 1687. |
Name the gases which dissolve in rainwaterbefore it reaches the ground. What harm canbe caused by these gases? |
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Answer» Answer: Name the gases which disolove in rain WATER before it REACHES the ground. Whatharm can be caused by these gases. The gases LIKE SO2 (sulphur dioxide) and NOX (nitrous OXIDES or NITRIC oxide) are present in the upper atmosphere. |
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| 1688. |
Rainwater is considered the purest form ofnatural water. Explain the statement. |
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Answer» Answer: Yes , rainwater is the purest form of NATURAL water Explanation: Rain water is CONSIDERED to be the purest form of natural water as it is directly comes from the condensation of water droplets. In the presence of sun, the water evaporates from the SEAS, oceans, RIVERS (from all the natural open resources of water) leaving behind all the impurities and form the cloud. Hope it helps :) |
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| 1689. |
The catalyst used in the laboratorypreparation of hydrogens is(a) zinc sulphate(b) aluminium sulphate(c) copper sulphate(d) ferrous sulphate |
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| 1690. |
3. A chemical change involves(a) Change of physical state only(b) Change of colour only(C) Formation of a new substance(d) None of these |
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| 1691. |
Are all endothermic reactions cold? |
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Answer» ENDOTHERMIC reactions are the OPPOSITE of EXOTHERMIC reactions. They absorb HEAT energy from their surroundings. This means that the surroundings of endothermic reactions are COLDER as a result of the reaction |
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| 1693. |
Why is only zinc used for galvanization and not any other non rusting metals?give reasons and facts for every answer.thanks |
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Answer» zinc is a HIGHLY reactive METAL that's why it is USED for GALVANIZATION |
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| 1694. |
You are provided with four test tubes containing distilled water, baking soda, tamarind solution and salt solution. Write down the the stepwise procedure to find the nature (acidic/basic/neutral) of each solution using turmeric. State your observation and inference |
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Answer» the answer is CARBONIZED and HORIZONS when we MIX them the ANSwer is come Answer. Pulteney is answer |
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| 1695. |
Why acids and bases are sometimes added to soil ? |
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Answer» its DONE to BALANCE the ph of the soil for the proper GROWTH of plant plz mark as BRAINLEST |
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| 1696. |
Iron(III) hydroxide forms a chalky white precipitate. true or false |
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| 1699. |
State roults law for a sodium containing non voletile solute desolve in voletile solvent |
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Answer» Answer: The vapour pressure of a solution of a non-volatile solute is EQUAL to the vapour pressure of the pure solvent at that temperature multiplied by its MOLE FRACTION. In equation form: pT=pB0.χB In this equation, pB0 is the vapour pressure of the pure solvent at a particular temperature, pT is the total pressure of the solution, χB is the mole fraction of the solvent. For a solution of a volatile solute (A) and solvent (B) total pressure is sum of the partial pressure of the TWO as: pT=pA0.χA+pB0.χB As χA++χB=1 or χA=1−χB or pT=pA0.(1−χB)+pB0.χB pT=pA0+(pB0−pA0).χB For non-volatile solute pA0=0 thus pT=pB0.χB Limitations of Raoult's law: 1. Intermolecular forces between the solvent and solute components shoul be similar to those betweenindividual molecules A_A=B-B=A-B 2. The GASEOUS phase are assumed to behave ideal where ideal gas law can be applied. |
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| 1700. |
4. The diagrams in the boxes show different arrangements of particles.BC сGive the letter of the diagram which represents:a) molecules of a compound -b) molecules of an elementc) atoms of a mixture -d) atoms of an element - |
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Answer» Where is the DIAGRAM |
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