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The diagram below shows part of the periodic table.  01. Which elements would react together to form covalent compounds? 02. Between the two elements W and Z, which will have a bigger atomic radius? Why? SOLUTION SOLUTION 01 Element Y and Z React together to form Covalent Compounds. Because Element Y has 6 Valence electronic in outermost shell and so it needs to gain 2 more electron to form compounds and Element Z has 7 Valence electronic in outermost shell and so it needs to gain 1 electron to stable. Thus Element Y and Z both want to gain electrons, they can share electrons with others to form covalent bonds. For your better Understanding here is the Periodic table chart SOLUTION 02 Between the two elements W and Z, W is the atomic radius that is bigger than Z, because W has more number of shells, Thus it have more numbers of atomic radius. 

The table shows the electronic structures of four elements. Element Electronic Structure P 2,6 Q 2,8,1 R 2,8,7 S 2,8,8 01. Identify which element(s) will form covalent bonds with carbon. 02. “Carbon reacts with an element in the above table to form several compounds.” Give suitable reason. SOLUTION SOLUTION 01 Covalent bonds are bonds formed by sharing electrons between 2 atoms. As per the electronic configuration of the given elements,  we can identify them as: P - Oxygen (O) Q - Sodium (Na) R - Chlorine (Cl) S - Argon (Ar) Now, we Know that Sodium (Q) is an Alkali Metal that denotes one electron to form ionic compounds.Hence, it does not form covalent bonds with carbon. Argon (S) is a noble gas. Noble gases  are inert elements that form neither ionic nor covalent bonds. Oxygen (P) and Chlorine (R) accept electrons to form ionic as well as covalent bonds. Oxyzen bonds with Carbon to form `"CO"_2`, While Chlorine forms `"CCl"_4`  Thus, the correct answer is P -

1.8m views Krishnanagar is a small town in Nadia District of West Bengal. Krishnanagar clay dolls are unique in their realism and quality of their finish. They are created by modelling coils of clay over a metal frame. The figures are painted in natural colours and their hair is made either by sheep’s wool or jute. Artisans make models starting from fruits, animals, God, goddess, farmer, fisherman, weavers to Donald Duck and present comic characters. These creations are displayed in different national and international museums.     Here are a few images (not to scale) of some clay dolls of Krishnanagar. The ratio of diameters of red spherical apples in Doll-1 to that of spherical oranges in Doll-2 is 2:3. In Doll-3, male doll of blue colour has cylindrical body and a spherical head. The spherical head touches the cylindrical body. The radius of both the spherical head and the cylindrical body is 3cm and the height of the cylindrical body is 8cm. Based on the above information answ

A lighthouse is a tall tower with light near the top. These are often built on islands, coasts or on cliffs. Lighthouses on water surface act as a navigational aid to the mariners and send warning to boats and ships for dangers. Initially wood, coal would be used as illuminators. Gradually it was replaced by candles, lanterns, electric lights. Nowadays they are run by machines and remote monitoring. Prongs Reef lighthouse of Mumbai was constructed in 1874-75. It is approximately 40 meters high and its beam can be seen at a distance of 30 kilometres. A ship and a boat are coming towards the lighthouse from opposite directions. Angles of depression of flash light from the lighthouse to the boat and the ship are 30 0 and 600 respectively. i) Which of the two, boat or the ship is nearer to the light house. Find its distance from the lighthouse? ii) Find the time taken by the boat to reach the light house if it is moving at the rate of 20 km per hour. SOLUTION (I) The boat is cl

The following age wise chart of 300 passengers flying from Delhi to Pune is prepared by the Airlines staff. Age Less than 10 Less than 10 Less than 10 Less than 10 Less than 10 Less than 10 Less than 10 Less than 10 Number of passengers 14 44 82 132 184 245 287 300 SOLUTION Converting the cumulative frequency table into exclusive classes, Age No of passengers`fi` `x``i` `fi` `x``i` 0-10 14 5 70 10-20 30 15 450 20-30 38 25 950 30-40 52 35 1820 40-50 50 45 2250 50-60 61 55 3355 60-70 42 65 2730 70-80 43 75 975 `\sum fi` = 300 `\sum` `fi` `x``i`  = 12600 Mean age = `\overline{x}` = `\frac{\sum f i x i}{\sum fi}`  = `\overline{x}` = `12600/300` = `\overline{x}` = 42 11.1 11.2 12 13 14 Term-2 Maths Basic Question Papers Solution-2021-22 Social Science Question Paper Solutions Mathematics Question Paper Solutions Mathematics Basic Question Paper Solutions Engl

Draw a pair of tangents to a circle of radius 6cm which are inclined to each other at an angle of `60^0`. Also find the length of the tangent. SOLUTION Step 1: Draw two concentric circles with focus O of 6cm Step 2:  Draw OA and OB with angle `120^0` Step 3:  Now, Draw ∠OAP =  ∠OBP = `90^0` Step 4:  PA and PB are required digressions  Step 5:  Now,  Join OP   ∴ tan ∠APO = tan 30° = `6/"PA"` ⇒ tan 30° = `6/"PA"` ⇒ `\sqrt{3}` = `6/"PA"` ⇒ PA = `6\sqrt{3}` ∴the length of the tangents are `6\sqrt{3}`cm 10 11.1 11.2 12 13 Term-2 Maths Basic Question Papers Solution-2021-22 Social Science Question Paper Solutions Mathematics Question Paper Solutions Mathematics Basic Question Paper Solutions English Question Paper Solutions Science Question Paper Solutions

Construct two concentric circles of radii 3cm and 7cm. Draw two tangents to the smaller circle from a point P which lies on the bigger circle. SOLUTION Step 1: Draw two concentric circles with focus O and radii 3cm and 7cm separately.  Step 2:  Then, Join OP and cut up it at O′, so PO′ = O′O  Step 3:  Now, Construct circle with focus O′ and sweep O′O  Step 4:  and at end Join PA and PB 09 10 11.1 11.2 12 Term-2 Maths Basic Question Papers Solution-2021-22 Social Science Question Paper Solutions Mathematics Question Paper Solutions Mathematics Basic Question Paper Solutions English Question Paper Solutions Science Question Paper Solutions

The sum of the squares of three positive numbers that are consecutive multiples of 5 is 725. Find the three numbers. SOLUTION Let the three consecutive multiples of 5 be 5x, 5x + 5, 5x + 10.  Their squares are `(5"x")^2`, `(5"x" + 5)^2` and `("5x" + 10)^2`.  ⇒   `(5"x")^2` + `(5"x" + 5)^2` + `(5"x" + 10)^2` = 725  ⇒ `25"x"^2` + `25"x"^2` + 50x + 25 + `25"x"^2` + 100x + 100 = 725 ⇒  `75"x"^2` + 150x - 600 = 0 ⇒  `"x"^2` + 2x - 8 = 0 ⇒ ( x + 4)  ( x - 2)  = 0 ∴  x + 4 = 0 and  x - 2  = 0 ⇒ x + 4 = 0 ⇒ x = -4 ⇒ x - 2 = 0 ⇒ x = 2 ∴ x =-4 and 2   Hence, Ignoring the negative value of x that is -4. So the Value of x is 2. the three consecutive multiples of 5 be 5x, 5x + 5, 5x + 10 By Putting x's  Value on  three consecutive multiples   ⇒   5x, 5x + 5, 5x + 10 ⇒   (5`\times`2),  (5`\times`2 + 5) and  (5`\times`2 + 10)   ⇒   10, 15 and 20 So, the  three consecutive multip