Explore topic-wise InterviewSolutions in Current Affairs.

Answer: In this case, the spheres of the third layer are exactly aligned with those of the FIRST layer. Thus, the PATTERN of spheres is REPEATED in alternate layers. ... pattern. This STRUCTURE is called a hexagonal close-packed (HCP) structure

First TREAT propanone with Grignard reagent , i.e.

Magnesium Methyl Bromide

CH3CO-CH3 + CH3Mg-Br → CH3-C(CH3)(OMgBr)-CH3

Then , Hydrolysis of the product formed will GIVE

2-methylpropan-2-ol

CH3-C(CH3)(OMgBr)-CH3 → CH3-C(CH3)(OH) +Br-Mg(OH)

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HOPE this helps you

Answer:

Mole fraction

x_{i}=\FRAC{n_{i}}{n_\text{tot}}

x_{i} = mole fraction

n_{i} = amount of a CONSTITUENT in moles

{n_\text{tot}} = total amount of all constituents in a MIXTURE in moles

Answer:

Tesla's mission is to accelerate the world's transition to SUSTAINABLE energy. Tesla was founded in 2003 by a GROUP of engineers who wanted to prove that people didn't need to compromise to drive electric – that electric VEHICLES can be BETTER, quicker and more fun to drive than gasoline cars.

Answer:

Carbon has 4 electrons in its outermost shell. ... Therefore, carbon completes its octet by sharing its 4 electrons with other carbon ATOMS or with atoms of other elements and FORMS covalent BOND. It forms strong covalent bonds because of its small SIZE

ANSWER:

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Explanation:

OK

ANSWER:

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Answer:

Sugars that can be oxidised by mild oxidising AGENTS are called REDUCING sugars. A non-reducing sugar is a sugar that is NOT oxidised by mild oxidising agents. All COMMON monosaccharides are reducing sugars. The disaccharides maltose and lactose are reducing sugars. The disaccharide SUCROSE is a non-reducing sugar.

Answer:

Hybridization is defined as the concept of mixing two ATOMIC orbitals with the same energy LEVELS to give a DEGENERATED new type of orbitals. This intermixing is BASED on quantum mechanics.

Explanation:

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ANSWER:

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Explanation:

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ANSWER:

option D is the right answer

Explanation:

lets draw the structure f the molecules

                     F

• BF3= F-B-F  in this B has 3 valence e-s PAIRED with THREE e- of each F , so there are only bond pairs no lone PAIR.(this option is incorrect)

• BeH2=   H-Be-H   in this Be has 2 valence e-s paired with 2 e-s each of H, so in this also there are no lone pair only bond pair(this option is incorrect)

                     H

• CH4=H-C-H, in this 4 valence e-s of C are paired with 4 e-s each of H,

                     H           so there are no lone pairs only bond pairs(this option                                                                                              is incorrect)

• SO2= O=S=O , in this there are 6 valence e-s of S but only 4e-s are paired with 2 O atoms , so it has both lone pair and bond pairs (this option is correct)

Answer:

a) The melting and boiling points are high

Explanation:

Covalent bonds have strong bonds within MOLECULES but small INTERMOLECULAR forces of ATTRACTION. This hives rise to low melting and boiling points.

ANSWER:

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Answer:

A mutualistic RELATIONSHIP is when two organisms of different species "work together," each benefiting from the relationship. One EXAMPLE of a mutualistic relationship is that of the oxpecker (a KIND of BIRD) and the rhinoceros or zebra. ... The oxpeckers get food and the beasts get pest CONTROL.

Answer:

In chemistry, the law of mass ACTION is the proposition that the rate of the chemical reaction is directly proportional to the product of the activities or concentrations of the reactants. It explains and predicts BEHAVIORS of solutions in DYNAMIC equilibrium

Answer is A

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EXPLANATION:

d is the ANSWER for above question

proton and NEUTRONS are CALLED NUCLEON

ANSWER:

yes because NA( SODIUM) has more ACIDIC nature

ANSWER:

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ANSWER:

B) metal

Explanation:

A rivet is a metal fastener, a bolt-like device that holds TOGETHER two pieces of metal or FABRIC. The round metal fasteners on your favorite pair of jeans are rivets. ... The Old French ROOT is river, "to clench or fasten."

Answer:

Both A and R are true and R is the correct explanation of A.

Explanation:

Required Answer:

Asertion

Brown fumes are produced when LEAD nitrate is hated

- The assertion is true because when lead nitrate is decomposed by heating, we get lead OXIDE (YELLOW), nitrogen DIOXIDE (brown fumes) and oxygen gas.

Reason :

Nitrogen dioxide gas is produced as a byproduct due to the decomposition of lead nitrate.

- The reason is also true because nitrogen dioxide gas is RELEASED as represented above in the reaction. They are brown in colour and are released as fumes.

Hence:-

Assertion and Reason both are true and Reason is the correct explanation of Assertion because it is describing about why brown fumes are produced.

Therefore∴ Option A is the correct option.

Answer:

BAHI SORRY Yaar mujhe NHI pata hai

Answer:

It does not CONTAIN hydrogen ions so not a PROTONIC acid but they can accept ELECTRONS from OH− so it is a LEWIS acid. So, we can say that Boric acid is not a protic acid.

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Answer:

There are some pores in an earthen pot through which the liquid INSIDE the pot evaporates. This evaporation makes the WATER inside the pot cool. In this WAY, water kept in an earthen pot becomes cool during summers

Explanation:

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ANSWER:

Gypsum is a water soluble compound but its solubility decreases with an increase in temperature. When gypsum is heated, water vapors are lost from it and it gets CONVERTED in a compound with CHEMICAL formula CaSo4. 12H2O, NAMED as “plaster of Paris”.

Explanation:

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Answer:

a.) 2

B.) 4

c.) 1

d.) 4

e.) 3

Thus we must multiply 6.022 * 1023 by 2 to calculate the number of individual atoms present in 1 mole of H2. We find our ANSWER to be 1.2044 * 1024.

REFER PIC for the answer

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Test to distinguish between alcohol and PHENOLS - definition

Test to distinguish between alcohol and phenols - definitionLitmus test : Phenols turn blue litmus red and ALCOHOLS have no effect. ... Ferric chloride test : Phenols GIVE blue, GREEN, and violet color while alcohol give no change in color.

Answer:

OPTIN a is CORRECT - 2 ethyl BUTANOL -1

The ozone LAYER or ozone shield is a region of Earth's stratosphere that absorbs most of the SUN's ultraviolet radiation. It contains a HIGH concentration of ozone in relation to other parts of the ATMOSPHERE, although still small in relation to other gases in the stratosphere.

right XD...

Answer:

FREE electrons HELP in CONDUCTION of electrical and thermal energy !

Answer:

1)gravitational FORCE

2) ELECTROMAGNETIC force(electric force+magnetic force)

3) Nuclear force

example

The electricity you get at your home is bcoz of an invisible force that acts on electrons RUNNING in WIRES of ur appliances. Bcoz a wire contains muillons of electrons bearing a random motion the flow of this occurs bcoz of electric force

Explanation:

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Explanation:

MO, it ACTS as promotor to ENHANCE CATALYTIC PROPERTIES of Fe

Answer:

b

Explanation:

4 lone PAIR, 2 SIGMA 2 PI bond

Answer:

Sulfuric ACID, H2SO4 is a CHEMICAL compound MADE up of two hydrogen atom, one sulfer atom, and four oxygen atoms.

Answer:

Carbon dioxide is a COLORLESS and non-flammable gas at normal temperature and pressure. Although MUCH less abundant than NITROGEN and oxygen in Earth's atmosphere, carbon dioxide is an important constituent of our planet's air. A molecule of carbon dioxide (CO2) is MADE up of one carbon atom and two oxygen atoms.

Answer:

Because the body requires less oxygen to burn carbohydrate as COMPARED to protein or FAT, its considered the body'smost efficient fuel source.

Carbohydrates, such as sugar and starch, are readily broken down into glucose, the body's principal energy source.

source of it is bread, pasta, rice, couscous, potatoes, breakfast CEREALS, oatsand other GRAINS like rye and barley

Explanation:

કારણ કે પ્રોટીન અથવા ચરબીની તુલનામાં શરીરને કાર્બોહાઈડ્રેટ બર્ન કરવા માટે ઓછી ઓક્સિજનની જરૂર હોય છે, તે શરીરના સૌથી કાર્યક્ષમ બળતણ સ્રોત તરીકે ગણાય છે

ખાંડ અને સ્ટાર્ચ જેવા કાર્બોહાઇડ્રેટ્સ સરળતાથી શરીરના મુખ્ય ઉર્જા સ્ત્રોત ગ્લુકોઝમાં તૂટી જાય છે.

બ્રેડ, પાસ્તા, ચોખા, બટાટા, નાસ્તો અનાજ, ઓટ્સ અને રાઇ અને જવ જેવા અન્ય અનાજ

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Answer:

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ANSWER:

Gravitational FORCE is always attractive in nature and is a very WEAK force. ... The force of ATTRACTION between the molecules of the same SUBSTANCE is called a cohesive force.

EXPLANATION:

બૂઝો દરરોજ ખોરાકમાં બટાટાનું શાક અને રોટલી જ આરોગે છે. આમ કરવાથી તેને

પડનાર સંભવિત મુશ્કેલી અંગે તમે શું સમજ આપશો ?

ANSWER:

Carbon dioxide is the principal PRODUCT of COMBUSTION of fossil FUELS since carbon accounts for 60–90 percent of the MASS of fuels that we burn.

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Answer:

Unit Cell

A crystal is an array of atoms packed together in a regular pattern. A unit cell of a pattern is a piece of the pattern which, when repeated through space WITHOUT rotation and without gaps or overlaps, reconstructs the pattern to infinity. For filling space without holes, a unit cell must be either a parallelogram (in 2D) or a parallelepiped (in 3D).

The symmetries of a pattern determine the shape of the unit cell. For example, mirror symmetry requires a rectangular (in 2D) or tetragonal (in 3D) unit cell. There is an infinite number of possible unit cells for any pattern (e. g., a given unit cell can generate a family of unit cells by repeated doublings in size). By custom, the unit cell is chosen to be the smallest one that reveals the special geometry characteristic of the symmetry. Thus, although an oblique parallelogram can be used for a pattern with 4-fold symmetry in 2D, a square is preferred.

When a unit cell is repeatedly translated to fill all of 2D or 3D space, the vertices of all the unit cells in the filled space constitute a lattice. A lattice is an infinite array of regularly-spaced points. All points in the lattice have identical "environments" --- the view from every point in the lattice is identical to that from any other point in the lattice. The absolute positions of the points of a lattice, and HENCE the unit cell, are arbitrary with RESPECT to a pattern.

Not all lattice points need coincide with unit cell vertices. Primitive unit cells use every lattice point as a unit cell vertex. Non-primitive unit cells, however, contain extra lattice points not at the corners.

A primitive unit cell contains exactly one lattice point. For example in 2D, each primitive unit cell joins four lattice points, each of which counts for 1/4 because every lattice point is shared among four unit cells. In 2D, a non-primitive unit cell has one ADDITIONAL lattice point exactly centered within it and is CALLED a body-centered non-primitive unit cell. In 3D, non-primitive cells are of three kinds:

end-centered : an extra lattice point is centered in each of two opposing faces of the cell

face-centered : an extra lattice point is centered in every face of the cell

body-centered : an extra lattice point is centered in the exact middle of the cell

ANSWER:

(c) They have 1−3 valence electrons.

All the METALS have 1−3 electrons in their valence shell and they lose their valence electrons to form positive IONS. However, other PROPERTIES like hardness, high melting and boiling points, malleability and ductility are not shown by all metals. Even though sodium and potassium are solids, they are soft, non-malleable and non-ductile metals. Further, they have LOW melting and boiling points. Similarly, mercury is found in liquid state at room temperature

ANSWER:

NORMALITY =N× Molarity=2×2=4 N.

Strong REPULSION between their protons makes their nuclei unstable.

Option (B) is correct.

Explanation:

• ATOMS having the same number of electrons and protons but different numbers of NEUTRONS are called isotopes.
• If the number of neutrons differs in an isotope then it means that they have a different mass.
• These are the variants of an element.
• For example, carbon has three isotopes. C12, C13, and C14.

Answer:

According to this LAW, gases combine or are produced in a chemical reaction they do so in a simple ratio by VOLUME provided all gases are at same temperature and pressure. So, the law of definite proportions when EXPRESSED in terms of volumes becomes 'Gay-Lussac's Law'.

ANSWER:

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ANSWER:

CRYSTAL of mohar's SALT 2.M/100Kmno4solution (1.58g/litres

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