Which of the following is not soluble in water?

Correct Answer: We know that polar substances are soluble in polar solvents and non polar substances are soluble in non-polar solvents only Here the hydrocarbons are non-polar molecular substances and water is a polar solvent So water can't dissolve hydrocabons Hence, as hydrocarbons are non-polar substances, they are insoluble in water as it is a highly polar solvent

Correct Answer: Both A & B

Explanation:

An Element is a pure substance of one type of atom. In chemistry, any material such as carbon, hydrogen, iron, or oxygen that cannot be broken down into more fundamental substances is nothing but an element.

Correct Answer: 6CO2 + 6H2O -----> C6H12O6 + 6O2

Explanation:

Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms activities.

 

Photosynthesis can be represented using a chemical equation.

 

The overall balanced equation is

 

               $$\begin{gathered} 6 CO 2 + 6 H 2 O ? Sunlight C 6 H 12 O 6 + 6 O 2 \\ S o u r c e o f C a r b o n & O x y g e n + \\ S o u r c e o f E l e c t r o n s & H y d r o g e n + \\ E n e r g y t h a t d r i v e s P h o t o s y n t h e s i s - - - - > \\ S u g a r + G a s p r o d u c e d b y s p l i t t i n g w a t e r . \end{gathered}$$

 

Where 

CO2 = carbon dioxide 

H2O = water

C6H12O6 = glucose 

O2 = oxygen.

Correct Answer: Nitrogen

Correct Answer: Acetic acid

Explanation:

In the form of vinegar, acetic acid is known from very early times. It is got by oxidation of fermented liquors (10-15%, alcohol) by air under the influence of a bacteria called 'mycoderma acetic'

Correct Answer: An ion

Explanation:

An electrically charged atom or group of atoms formed by the loss or gain of one or more electrons is called an Ion.

Cation:

An ion is a cation (positive ion) if it is created by electron loss and is attracted to the cathode in electrolysis.

Anion:

An ion is an anion (negative ion) if it is created by an electron gain and is attracted to the anode.

 

The valence of an ion is equal to the number of electrons lost or gained and is indicated by a plus sign for cations and a minus sign for anions.

Ex: Na +, Cl?, Ca ++,...

Correct Answer: Ethylene

Explanation:

Allotropes are different structural modifications of an element, that is, each of two or more different physical forms in which an element can exist.

 

Carbon is capable of forming many allotropes due to its valency. Well-known forms of carbon include charcoal, diamond, graphite, buckminsterfullerene and graphene.

 

Hence, Ethylene is not an allotrope of Carbon.

Correct Answer: 3' > 2' > 1'> NH3

Explanation:

The order of basicity in ammonia is different in gaseous phases vs. aqueous phases due to hydrogen bonding.

 

So in gaseous phases it's the well known: 3' > 2' > 1'> NH3. Just so we're on the same page, this is due to the inductive effect of electron donating alkyl groups--they destabilize the lone pair on nitrogen atom, making nitrogen more basic.

 

But in aqueous phase, the order is slightly different: 2'> 1'> 3' > NH3.

Correct Answer: 109.9446

Explanation:

The term gram formula mass is synonymous with molecular mass. So, to get this, we must add molar mass of all the elements in this compound.

 

Given compound is Lithium Sulphate -  Li 2 SO 4

Elemental calculation ::

Li  -  Lithium   -   6.941    -     2   -   13.88200 %
S  -  Sulfur     -    32.065   -    1   -   32.065 %
O  -  Oxygen   -   15.9994  -    4   -   63.9976 %

Now, total = 12.6264 + 29.1647 + 58.2090 = 109.9446 

 

Hence, the gram formula mass of Li2SO4 = 109.9446.

Correct Answer: Hexane > Pentane > Propane

Explanation:

The boiling point of the compounds depend on the number of carbons in them. Hexane has 6, Pentane has 5 and Propane has 3 carbons. As Hexane is with 6 carbons it has highest boiling point and next Pentane with 5 and lowest Propane with 3.