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it is +ve , option 3

because formation of gasses increases randomness and thus ↑ entropy

option A is correct as, some non-metaloxides, such as nitrous oxide(N2O) and carbon monoxide (CO), do not display any acid/base characteristics.

Reaction :Ag^+ + e^- ----- Ag

a. One mole of electrons are required to deposit one mole of silver (107.8 g/mol)= Charge of one mole of electrons = 96500 C= 96500 C ----- deposit 107.8 g of Ag= x C ----- deposit 1.078 gx = 96500 * 1.078 / 107.8 = 965 C of electricity is utilized.

b. 2 H2O- ---- O2 + 4 H+ + 4e-= 96500 C ---- liberate 32 g of oxygen965 C liberate ----- 965 * 32 / 96500 = 0.32 g.

b's answer is 0.16g

Okay so as we move from left to right in a period in the periodic table the metallic character of the elements goes on decreasing.

This is because in a period electrons are added in the shells but the number of shells remain constant. Metals have a tendency to lose electrons. Thus when electrons are added the size of atoms decreases due to increased nuclear pull and it becomes difficult for the elements to lose electrons.

So as we move from left to right in a period in the periodic table the metallic character goes on decreasing!

Magnesium + Zinc Chloride = Magnesium Chloride + Zinc OxideDouble displacement reactionMgO + ZnCl2 = MgCl2 + ZnO

answer c is correct hai

6×0.35×6.023×10^23=12.64×10^23=1.26×10^23

The total mass of products formed will be the same as the total mass of reactants i.e. 40g because the law of chemical combination states that mass can neither be created nor can be destroyed during a chemical reaction of compounds and elements.

option bThis is due to the fact that covalent character is inversely proportional to the electronegativity difference. since, similar atoms will have same electronegativity, these show the maximum covalent character.

1. N2 + 3 H2 ----- 2 NH3

2. 2 H2 + O2 ---- 2 H2O

3. Na2O + H2O ----- 2 NaOH

4. 2 CO + O2 ---- 2 CO2

5. Zn + 2 HCl ---- ZnCl2 + H2

it's acid base reaction which forms salt and water

Sodium hydroxide+ hydrochloric acid =sodium chloride + waterNAOH+HCL= NACL+H2Othis is also example of neutralisation reaction.

NaOH (aq) + HCl ⇨ NaCl (aq) + H2O (l)

We know that 6.022 *10^23 atoms = 1 mole

8.46 ×10 24 atoms * 1 mole /6.022 *10^23 atoms

= 14.05 mole Mg

MgF because it is ionic whereas MgO is slightly covalent due to Fajans rule.

Bigger the anion more is covalent character

Na +h2o = NaOH + H2 + heat

Weight of NaOH = N* E.W. * V/1000

Put the values in the above formula

Weight of NaOH required.= 0.1 *40 *1500/1000

= 6 gm

option c) Zn + 2NaOH Na2ZnO2+ H. Zinc react with sodium hydroxide to produce zincate sodium and hydrogen. This reaction takes place at atemperature near 550°C.

The answer c is the correct one. your answer is right.

Molecular mass of CaCO3 =sum of all the masses of its components.Ca=40uO=16uC=12uMolecular mass=40+12+3x16=40+12+48=100uTherefore, molar mass of CaCO3 is 100g100g of CaCO3 contains 1 mole.? ------------------------------> 5moles=100x5/1=500 gms∴ 5moles of CaCO3 contains 500g

Volume of HCl = 1 cm3​ or 0.001 LNormality of HCl = 0.1 NNumber of gram-equivalents of HCl= Normality×Volume= 0.1×0.001= 0.0001Volume of solution = Volume of NaCl + Volume of HCl= 1 + 0.001= 1.001 LAs NaCl is salt it will not contribute towards the pH of the solution.Normality of HClin resulting solution = 0.0001 / 1.001= 0.0001 NpH = -log[H+]= - log(0.0001)= 4

Lithium = 1s2 2s1 Chlorine = 1s2 2s2 2p6 3s2 3p5Potassium = 1s2 2s2 2p6 3s2 3p6 4s1Sodium = 1s2 2s2 2p6 3s1Carbon = 1s2 2s2 2p6

Answer is a. oneThe elements present in halogen group have 7 electrons in their outermost shell. If they accept one more electron from any other item their outermost octet becomes complete. So their valency is said to be equal to 1.

Atoms can gain or lose electrons. When an atom gains an electron, energy is given off and is known as the electron affinity.Electron affinityis defined as the energy released when an electron is added to a gaseous atom or ion.When most reactions occur that involve the addition of an electron to a gaseous atom, potential energy is released.

plants with weak stems generally possess tendrils

Across the period electropositivity decreases and down the group increasesHence Mg is the most electropositive

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C + O2→ CO2

3 g 8 g 11 g

Total mass of reactants = mass of C + mass of O = 3+8=11g

Total mass of reactants = total mass of products

Hence, the law of conservation of mass is proved.

Further, it also shows carbon dioxide contains carbon and oxygen in a fixed ratio by mass, which is 3 : 8. Thus it also proves the law of constant proportions. 3 g of carbon must also combine with 8 g of oxygen only. This mean that (50 – 8) = 42 g of oxygen will remain unreacted

full ques.-

it will be 2.0

ok

2 is the correct answer of the given question

Atomic size increases down the group.

White fumes evolves when mg ribbon is burnt

white fumes evolves when magnesium ribbon burns

Organic chemistry is the study of chemical compounds that contain carbon. Carbon has the ability to form a chemical bond with a wide variety of chemical elements and other carbon atoms. This allows a nearly unlimited number of combinations. The subject of carbon compounds is called organic chemistry because all known organisms, or living things, are made up of water and carbon compounds. Organic chemistry largely involves the synthesis, or formation, of organic products by chemical reaction using different reactants and reagents, the substances used up during a reaction. Several different areas of chemistry expand on the concepts and principles of organic chemistry, including biochemistry, microbiology, and medicine

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A mole of a substance is defined as: The mass of substance containing the same number of fundamental units as there are atoms in exactly 12.000 g of 12C. a)6.022*10^23 atoms form 1 mole of an elementtherefore 3.011*10^23 atoms forms, 3.011*10^23/(6.022*10^23)=0.5 molesb)Two atoms are present in Otherefore O2=16*2=32=molar massno of moles= given mass/ molar mass=32/32=1 therefore no of moles of O2= 1

Answer:2)M/7

Explanation:

Equivalent mass=MolecularweightChangeinoxidationnumberpermole=MolecularweightChangeinoxidationnumberpermole

Suppose molecular weight is M

Oxidation number of I2inIO−4IO4−in Acidic medium i.e.,I×(−8)+1e−=+7I×(−8)+1e−=+7

So eq. wt. = M/7.

(i) CnH2n is a general formula of a hydrocarbons group

(ii) The one with the minimum number of carbon atoms is C because it has the lowest boiling point

The boiling points of hydrocarbons increases with the increase in their molecular masses whichalso increase with increase in the number of carbon atoms.

(iii) The homologous series is alkenes.

a. analysis is detailed examination of the elements or structure of something.

b. identification of the constituents, e.g. elements or functional groups, present in a substance.

c. a substance or mixture for use in chemical analysis or other reactions.

d. The emergence of the insoluble solid from solution is calledprecipitation.