Explore topic-wise InterviewSolutions in Current Affairs.

As all the SUBSTANCE do not EVOLVE HYDROGEN GAS on BURNING

Electrons are filled according to aufbau principle into VARIOUS energy LEVELS..it's also CALLED (n+L) RULE..where n=principle quantum number and l is azimuthal quantum number

Bonjour!

No. of moles = ?
Gram of NACL = ?
Molecular weight of NaCl = 58.5 g
Volume of solution = 250 ML
Molarity = 0.50 M or M/2




So,


So, Mole of NaCl = 1/8 mol

As we know;


So,

Therefore there are 1/8 mole and 7.3125 gm of NaCl present in 250 ml of 0.50M solution.

Hope this HELPS...:)

Tin
copper
alluminium
gold
SILVER
bronze
lead
iron
zinc
titanium
cobalt

This MAY HELP U.........

Hey mate!!!

➡️Metalloid that has the VISUAL appearance of a metal, but is a poor CONDUCTOR of ELECTRICITY; metalloids are generally semiconductors. The ELEMENTS classified as metalloids are boron,silicon, germanium, arsenic, antimony,tellurium, and polonium.

Rigidity-it is a property by which a SUBSTANCE RETAIN its shape when force is applied to it
compressibility-the property by vertue of which the volume of substance can be decreased
fluidity-it is the property by vertue of it the molicules of one substance can flow from one point to another
shape-it is the definate geometrical arrangement of a substance
kinetic energy-the energy possesed by a PARTICLE due to its motion is called...
density-the mass PER UNIT of volume of a substance is called density
density=mass/volume

ANSWER:

EXPLANATION:

DECREASES the ACIDITY due to INDUCTIVE effect

In SOOTH, it APPEARS to be but it isn't when seen with the HELP of a microscope..... Colloidal particles can't be seen with a naked eye

We should wear COTTON clothes in SUMMER because ,due to heat during summer DAYS our body becomes sweaty and this SWEAT is easily EVAPORATE from the cotton clothes so we should wear cotton clothes during summer days.

ANSWER:

Explanation:

Silver has a VARIABLE VALENCY, hence shows both OXIDATION state

Hot FOODS smell goes farther BCOZ the particles of smell will diffuse air in form of SMOKE so by DIFFUSION of smell particles it happens

To REDUCE HIGH TEMPERATURE in our BODY

ANSWER:

Explanation:

depots MIGHT CATCH FIRE and lead to an ACCIDENT

Ice at 273 k is more EFFECTIVE in cooling than WATER at 273 k because water have some HEAT dissolved in it in the form of latent heat of FUSION which is not present in ice at same temperature

It's EASY to tell if a glass fuse is blown; it will show scorch MARKS, and the filament will be melted. To check a ceramic fuse, USE an ohmmeter or continuity TESTER. With an ohmmeter or multimeter, you should see a reading close to zero ohms if the fuse is INTACT, or infinite if it's blown.

The ATOMIC masses of most elements are fractional because they exist as a MIXTURE of isotopes of DIFFERENT masses.Most elements occur as a mixture of isotopes of differentmasses. The fractional atomic masses ARISE because of this mixture. ... mass = TOTAL mass of all atoms/number of atoms.

Answer:

Explanation:

The copper PLATE was immersed in silver NITRATE solution. After some TIME, a black layer was observed on the surface of the copper plate. GIVE reasons for this and WRITE the chemical equations of the reaction involved.

By OBSERVING the COLOUR changes in a PH paper we determin whether a solution is acidic basic or neutral and its STRENGTH

The magnesium ribbon is QUITE reactive ELEMENT .it Pp reacts with atmospheric oxygen to produce a layer of magnesium oxide which PREVENT it from Burning. HENCE, we have to clean it with the Sandpaper to remove it.

1.solid
is rigid.
more HEAVY than LIQUID.
have FIXED VOLUME and SHAPE.
2.liquid
is fluid.
have fixed volume.
3.gas
is fluid.
neither have fixed volume nor fixed shape.

As surface area is DIRECTLY PROPOTIONAL to evaporatio SINCE it get AFFECTED by it

Evaporation of PETROL is a physical change because no NEW chemicalsubstance is FORMED

Observation : the RED brown vapour will spread in both the JARS
PROPERTY of MATTER : SPACES in particles and diffusion

Percentage of OXYGEN in air is 80%

percentage = VOLUME of the oxygen/volume of air ×100

80 = volume of oxygen/1L × 100

80L × 1/100 = volume of oxygen

0.8L = volume of oxygen

[or you can directly do it like in 1L air percentage of oxygen is 80 MEANS 0.8L oxygen and 0.2L other substance]
_____________________________________________________

We KNOW that one mole of any substance CONTAINS 22.4L volume in STP (standard temperature and pressure) so,

volume = number of moles ×22.4

volume/22.4 = number of moles

0.8/22.4 = number of moles

0.036 = number of moles
______________________________________________

we know that one mole of any substance contains 6.022×10^23 molecules.

molecules = number of moles × 6.022×10^23

molecules = 0.036 × 6.022 × 10^23

molecules = 0.216 × 10^23

molecules = 2.16 × 10^22 " O2 molecules ”
_______________________________________________

use can directly find it use this formula
molecules = volume of substance/22.4 × 6.022×10^23

Hello there
I'm attaching a picture of the ANSWER
Hope it helps...and don't forget to MARK the answer brainliest if you really find it useful.
doubts are ALWAYS WELCOME...
Thanks

Water is a POLAR covalent COMPOUND. It decreases the electrostatic forces of attraction, RESULTING in FREE ions in AQUEOUS solution. Hence, ionic compounds dissolve in water. Kerosene is a non-polar organic solvent and dissolves non-polar covalent compounds.
pls mark brainliest 

Hii
.
.
.
.
The Answer is (B) 1kg of COPPER.
.
.
It May Be HELP You

PLZ.. Mark As BRAINLIEST.....

Yes it is solid it can be COMPRESSED becoze it have pores INSIDE it which ALLOW air to PASS.

The atomic MASSES of most elements are FRACTIONAL because they exist as a MIXTURE of isotopes of different masses. Most elements OCCUR as a mixture of isotopes of different masses. The fractional atomic masses arise because of this mixture. Avg. mass = total mass of all atoms/number of atoms.

This is because of the TEMPERATURE in kinetic ENERGY of the PARTICLES ALSO increases and the diffuse into the AIR and reaches us to very quickly .

Soda water , AIR ,vinegar and filtered TEA are homogeneous while sooo and wood are HETEROGENEOUS MIXTURE.....

Conversion of acetaldehyde into acetone INVOLVES two steps as follows. Step-1:—Conversion of acetaldehyde to isopropyl alcohol. Acetaldehyde is treated with methyl magnessium bromide in PRESENCE of dry ether to form Mg complex which on acid hydrolysis,isopropyl alcohol is OBTAINED.

Hey mate here is ur ANSWER..............

because hard WATER contains DISSOLVED salts of magnesium and calcium.When such water is heated in boilers it decomposes and 
a hard layer of calcium and magnesium carbonate is DEPOSITED at the bottom of boilers. In due course this layer renders the 
boilers useless. so it is softened before boiling .A water softener removes hard water minerals, like calcium and magnesium.


hope it may HELP u dear.......

After much debate, the wavefunction is now accepted to be a probability distribution. The SCHRODINGER equationis used to find the allowed energy LEVELS of quantum mechanical systems (such as atoms, or transistors). The associated wavefunction gives the probability of finding the PARTICLE at a CERTAIN position.

CONCENTRATION of SOLUTION
= AMOUNT of SOLUTE/ amount of SOLVENT
=15/285
=1/19
=.0526

SOLID changes into liquid by heating. Liquid changes into gas by heating. if a molecule of a solid liquid gas is heated the solid and liquid the solid molecule will CHANGE into liquid and liquid into gas. But the TEMPERATURE of gas is INCREASES

Aqua regua is a ACID
The metals which can be DISSOLVED in it are :
1 gold
2 platinum
3 palladium

ANSWER:

Explanation:

Yes,it is TRUE as there is no acidic hydrogen in TERTIARY amine.Only primary and secondary amine can react as they have 2 and 1 acidic hydrogen respectively which is required for REACTION with benzene SULPHONYL chloride.Hope you understood.