Chemistry Quiz-Periodic Table

PERIODIC TABLE (Quiz)

Quiz

 

1. The law of triads is applicable to
   
   1.   (1) C, N, O
   2.   (2) H, O, N
   3.   (3) Na, K, Rb
   4.   (4) Cl, Br, I
2. Which of the following set of elements obeys Newland's octave rule –
   1.   (1) Na, K, Rb
   2.   (2) F, Cl, Br
   3.   (3) Be, Mg, Ca
   4.   (4) B, Al, Ga
3. The first attempt to classify elements systematically was made by -
   1.   (1) Mendeleev
   2.   (2) Newland
   3.   (3) Lother Meyer
   4.   (4) Dobereiner
4. Which of the following element was present in Mendeleev's periodic table?
   1.   (1) Sc
   2.   (2) Tc
   3.   (3) Ge
   4.   (4) None of these
5. Which of the following element has 2nd IP < 1st IP
   
   1.   (1) Mg
   2.   (2) Ne
   3.   (3) C
   4.   (4) None
6. Which of the following statement is wrong :-
   
   1.   (1) Total no. of liquid elements in the periodic table.....Six
   2.   (2) First metal element in the periodic table is....Li
   3.   (3) All type of elements are present in 6th period
   4.   (4) Iodine is a gaseous element.
7. Arrange the elements in increasing order of atomic radius Na, Rb, K, Mg :–
   
   1.   (1) Na, K, Mg, Rb
   2.   (2) K, Na, Mg, Rb
   3.   (3) Mg, Na, K, Rb
   4.   (4) Rb, K, Mg, Na
8. Which has the lowest anion to cation size ratio-
   
   1.   (1) LiF
   2.   (2) NaF
   3.   (3) CsI
   4.   (4) CsF
9. Which of the following pairs of elements have almost similar atomic radii :-
   
   1.   (1) Zr, Hf
   2.   (2) Mo, W
   3.   (3) Co, Ni
   4.   (4) All
10. Which statement is false:
    1.   (1) Screening effect increases down the group
    2.   (2) Zeff increases down the group
    3.   (3) Zeff. increases in a period
    4.   (4) All
11. Which of the following statement is wrong :-
    1.   (1) All the actinides are synthetic (man made) elements
    2.   (2) In the Lanthanides last electron enters in 4f orbitals
    3.   (3) Np93 onwards are transuranic elements
    4.   (4) Lanthanum is d–block element

CORONA versus MASKS

 SEPARATION OF SUBSTANCES

Separation of substances is done either to get desirable substances or to remove harmful substances from the products. There are many separation techniques to separate the components. One separation technique is FILTRATION .

FILTRATION- The process of separating suspended solid matter from a liquid, by causing the latter to pass through the pores of membrane, called a filter is called filtration.

Nowadays during the COVID situation, all of us are wearing masks when stepping out of the houses. Have you ever thought that these masks use filtration process to separate harmful components from air?

Masks and respirators are useful items to keep flu, airborne pandemics and COVID-19 at bay. Masks are excellent at blocking bodily fluids, which contain virus and bacteria. Face masks tend to be looser fitting against the face and leave a gap between your skin and the edge of the mask. This makes face mask fairly inefficient to block smaller germ-laden particulates, which can easily sneak into the open gaps. Face masks do protect the nose and mouth well from larger particulates including saliva and respiratory emissions.

Respirator masks, like N95 RESPIRATOR MASK, are very similar to face masks in shape, but are more capable of protecting against small contaminated air borne particulates. It is so designed to fit closely to the face, eliminating the gap that regular face masks have. This mask will protect the user against the small particles and will also, like regular face masks, block and filter large particulates and protect against splash back, sprays, and large droplets.

CAUTION: All face masks are one time use and should never be shared.

 STAY SAFE, WEAR MASK On the basis of your understanding about how filtration technique is used to separate harmful contaminants present in air, answer the following

Q1What is the difference between simple ply mask and N95 mask? 

2. choose the correct option?  

Sl.no	Statement	Yes/No tick correct answer
1	CORONA VIRUS gets spread from one person to another?	Yes/ No
2	Sensitization is not necessary for us	Yes/no

 

Q 3. What are the precaution measures to be taken to be safe from COVID 19? Mention any two points.

Ans:__________________________________________________________ ______________________________________________________________

4. Statements given below are incorrect. Write the correct statements.

a) The process by which the insoluble components of muddy water settle down is called decantation. __________________________________________________________________

 b) The common salt is obtained from sea water by the process of condensation. ________________________________________________________________________

 Q5. Symptoms can be seen in corona patients following are the given symptoms

(1)  Red Eyes

(2)  Difficulty in breathing

(3)  Coughing

(4)  Body swelling

Choose the correct option

(a)     Only option 1

(b)     Option 1&2

(c)     Option 2&3

(d)     Only option 4                                                                    

  Q6. Suggest any other name for this topic...................     

EVOLUTION

Evolution explains the beginning of life on earth. Charles Darwin uncovered the theory of evolution and the method of natural selection. Thanks to Darwin, now we know why life is the way it is. Evolution explains the concept of genesis of

first life in so called ‘hot dilute soup’ from the inorganic substances and also new species from pre-existing ones. Idea of evolution also describes the concept of homologous and analogous organs. Homologous organs are those organs which are structurally same, share a common origin but functionally they are different. Analogous organs represent a different scenario. Here we find that organs perform same function but they are not structurally same and they don't share any immediate common ancestor. Darwin emphasized on natural selection as the driving force of evolution but recent studies show the presence of genetic drift along with natural selection as the driving force of evolution.

 

Q1. Evolution describes –

a)      Origin of earth

b)      Origin of universe

c)      Origin of life on earth

)     Origin of atmosphere around the earth Scoring –

 

Full credit – Option c)

 

No credit – Any other option or missing response Context – Evolution

 

Situation – Global

 

Process – Identifying scientific concept Level – Easy

 

Type – Simple MCQ

Q2. Do you agree with following statements? Encircle YES or NO.

Statement – First life originated in primitive ocean. (YES / NO)

 

Statement – Patagium of bat and insect wings are homologous organs. (YES / NO)

Scoring –

 

Full credit – YES for first statement and NO for second statement

 

No credit – Any other answer or no response.

Context – Evolution

 

Situation – Global

Process – Explaining scientific phenomenon

 

Level – Medium

 

Type – Complex MCQ

 

Q3. Read the following statement and encircle AGREE or DISAGREE.

Statement – The origin of first life was abiogenic (AGREE / DISAGREE)

 

Scoring –

 

Full credit – AGREE

No credit – DISAGREE or missing response

 

Context – Evolution

Situation – Global

 

Process – Deciphering scientific concept

 

Level – Medium

Type – Complex MCQ

Q4. To prove that first life originated from simple inorganic molecules and the climate of the primitive earth helped in that, two renowned scientists performed a famous experiment. They simulated the climate of the primitive earth in the laboratory and proved the same.

The figure above shows the scheme of the experiment conducted by those two renowned scientists. Upon analysis it was found that at least five amino acids were produced when the experiment was conducted for one week from the inorganic gases. This famous experiment was performed in the year of 1953.

 

From the description and figure, identify the experiment and name the scientists who performed the experiment.

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Scoring –

 

Full credit – Stanley Miller and Harold Urey

No credit – Any other name or missing response.

Context – Evolution

Situation – Global

Process – Identifying scientific concept

Level – Medium

Type – Closed construct

Q5. A student of science got interested in this experiment and he tried to perform the same experiment to see what are the organic chemicals that are produced after a week-long experiment. He added all the materials but somehow forgot to add ammonia. After experiment, he performed analysis through paper chromatography but couldn’t see any spot on it. However going through the literature, he found out that Miller and Urey saw some spots of amino acid in the chromatographic paper.

 

Can you imagine the reason behind this?

 

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Scoring –

 

Full credit – As the student forgot to add ammonia, no amino acid was synthesized in his reaction. Ammonia acts as a source of nitrogen for amino acid and as the experimental container was sealed, nitrogen couldn’t enter it from the atmosphere. Due to absence of amino acid, no spot was seen in the paper chromatography.

 

Partial credit – Ammonia is one of the main ingredients to produce amino acid

 

OR

 

All the components are necessary to produce amino acid

 

No credit – Any other answer or no response.

Context – Evolution

Situation – Global

 

Process – Explaining scientific phenomenon

Level – Hard

 

Type – Open construct

Biomolecules-Carbohydrates

 

Biomolecules are the complex organic molecules such as carbohydrate, proteins, lipids, nucleic acid etc. which be done living organisms and required for the growth and maintenance are called biomolecules.

Carbohydrates- are primary energy sources are also known as saccharides.

      ·        is optically active polyhydroxy Aldehyde or polyhydroxy ketones or the compounds which can be hydrolysed to them.

      ·       General formula- C_x(H₂O) y

      ·        Formaldehyde and acetic acid have like this formula (CH₂O), (C₂H₄O₂) respectively but these are not carbohydrate.

      ·       Deoxyribose (C₅H₁₀O₄) is carbohydrate but it does not obey the general formula of carbohydrate.

Type of carbohydrates upon their hydrolysis -

Mono-saccharides (Simple Carbohydrate)	Oligosaccharides	Polysaccharides
Cannot be hydrolysis into other simpler	On hydrolysis, give 2-10 units of monosaccharides	On hydrolysis, give a large number of monosaccharide units
Ex- Glucose-contains CHO group Fructose-contains (C=O) Keto group	Ex- Sucrose- Glucose + Fructose Maltose- Glucose + Glucose Lactose- Glucose + Galactose	Ex- Cellulose –contain many D-Glucose units joined by B-Glyosidic linkage between glucose units Starch- is polymer of D-Glucose

Starch is polymer of D-Glucose consist of two components. These are as-

S.No.	Amylose	Amylopectin
1	Linear polymer of D-Glucose	Consist of linear as well as branched chain polymer of D-Glucose
2	Soluble in water	Insoluble in water
3	give blue colour with I2	Do not give blue colour with I2

Type of carbohydrates upon Reducing nature-

S.No.	Reducing Sugar	Non-reducing sugar
1	Can reduce Tollen’s reagent & Fehling ‘s solution Since these have Free aldehyde (-CHO) or keto group(=CO)	Can not reduce Tollen’s reagent & Fehling ‘s solution Since these have no free aldehyde or keto group
2	Ex-       ·    All Monosaccharides such as         Glucose, Fructose      ·       Maltose-Disaccharide      ·       Lactose -Disaccharide	Ex-         ·     Sucrose,        ·       Cellulose