Description : An organic compound (A) has a molecular weight 78 and an empirical formula CH. (A) is resistant to attack by oxidizing agents but undergoes substitution and addition reactions. X-ray analysis shows that the ... suggests that compound (A) is (a) Benzene (b) Cyclohexane (c) Toluene (d) n-Hexane
Last Answer : Benzene
Description : Which statement about the structure of benzene is not true? (a) The two Kekule structures of benzene are in equilibrium. (b) The carbon-carbon bond lengths in benzene are greater than the carbon- ... (d) The stability of benzene ring is much greater than the stability of 1,3,5- cycloheptatriene
Last Answer : The two Kekule structures of benzene are in equilibrium
Description : The carbon-carbon bond lengths in rank of increasing bond length is : (a) triple, double, single (b) single, double, triple (c) single, triple, double (d) triple, single, double
Last Answer : triple, double, single
Description : Assertion: The O - O bond lengths in ozone molecule are intermediate between single and double bonds. Reason: `O_(3)` molecule is a resonance hybrid.
Last Answer : Assertion: The O - O bond lengths in ozone molecule are intermediate between single and double bonds. ... I is not correct and Statement-II is correct
Description : What is the correct sequence of the riven Godavari, Mahanadi, Narmada and Tapi in the descending order of their lengths? (a) Godavari – Mahanadi – Narmada – Tapi (b) Godavari – Narmada – Mahanadi – Tapi (c) Narmada – Godavari – Tapi – Mahanadi (d) Narmada – Tapi – Godavari – Mahanadi
Last Answer : Ans: (b)
Description : What is the correct sequence of the rivers- Godavari, Mahanadi, Narmada and Tapi in the descending order of their lengths? [IAS 2003] (a) Godavari - Mahanadi - Narrnada - Tapi (b) Godavari - Narmada - Mahanadi - Tapi (c) Narmada - Godavart - Tapi - Mahanadi (d) Narmada- Tapi - Godavari – Mahanadi
Description : The line through the points (4, 3) and (2, 5) cuts off intercepts of lengths λ and μ on the axes. Which one of the following is correct ? -Maths 9th
Last Answer : (c) a, b, c are in H.P. only for all m As the points A(a, ma), B[b, (m + 1)b] and C[c, (m + 2)c] are collinear. Area of Δ ABC should be equal to zero.⇒ \(rac{1}{2}\)[x1(y2 - y3) + x2(y3 - y1) + ... - bc = 0 ⇒ ab + bc = 2ac ⇒ b = \(rac{2ac}{a+c}\)∴ a, b, c are harmonic progression (H.P.) for all m.
Description : Pick up the correct statement from the following: (A) The framework which consists of a series of connected lines, the lengths and directions of which are found from measurements, is called a traverse ... system and ends on another such point, is called a controlled traverse (D) All the above
Last Answer : (D) All the above
Description : Pick up the correct statement from the following: (A) The artificial barrier constructed to enclose "n area for safe anchorage, is called break water (B) The smoothened surface at the top end of ... fending (C) The effective berthing lengths of inclined guays can be adjusted (D) All the above
Description : When two helical springs of equal lengths are arranged to form a cluster spring, then a. Shear stress in each spring will be equal b. Load taken by each spring will be half the total load c. Only A is correct d. Both A and B is correct
Last Answer : d. Both A and B is correct
Description : The blue colour of sky is due to – (1) reflection of sunlight (2) refraction of sunlight (3) scattering of shorter wave-lengths of sunlight in the atmosphere (4) scattering of longer wave-lengths of sunlight in the atmosphere
Last Answer : (3) scattering of shorter wave-lengths of sunlight in the atmosphere Explanation: The blue colour of the sky is caused by the scattering of sunlight off the molecules of the atmosphere. This scattering, ... to the direction of the sun's light is predominantly in the blue end of the spectrum.
Description : Which statements about alkenes and alkanes of corresponding chain lengths is true? (I) Alkenes have slightly lower melting points than alkanes (II) Alkenes have slightly higher melting points than alkanes (III) Alkenes have higher boiling ... (a) I and III (b) II and IV (c) I and IV (d) II and III
Last Answer : I and III
Description : Correct order of indicated bond length is/are:
Last Answer : Correct order of indicated bond length is/are: A. `CH_(2)overset(a)=CH-O"Me" lt O_(2)N-CH_(2)overset( ... CH_(3)-underset(O)underset(||)Cul(b) O^(Ѳ)`
Description : The correct order of sulphur - oxygen bond energy in `S_(2)O_(3)^(2-), SO_(4)^(2-), SO_(3) and S_(2)O_(6)^(2-)` is
Last Answer : The correct order of sulphur - oxygen bond energy in `S_(2)O_(3)^(2-), SO_(4)^(2-), SO_(3) and S_(2)O_(6)^( ... (4)^(2-) lt SO_(3) lt S_(2)O_(3)^(2-)`
Description : The correct order in which oxygen - oxygen bond dissociation energy increases is:
Last Answer : The correct order in which oxygen - oxygen bond dissociation energy increases is: A. `H_(2)O_(2)ltO_(2)ltO_(3)` ... 2)` D. `O_(2)ltH_(2)O_(2)ltO_(3)`
Description : The correct order of O - O bond length in `O_(2)H_(2)O_(2)` and `O_(3)` is
Last Answer : The correct order of O - O bond length in `O_(2)H_(2)O_(2)` and `O_(3)` is A. `O_(2)gtO_(3)gtH_(2)O_( ... )O_(2)gtO_(2)` D. `H_(2)O_(2)gtO_(3)gtO_(2)`
Description : Which of the following has the highest bond order? (1) N2 (2) O2 (3) Cl2 (4) H2
Last Answer : (1) N2 Explanation: A high bond order indicates more attraction between electrons. A higher bond order also means that the atoms are held together more tightly.
Description : Arrange the following in the increasing order of C-C bond length- C2H6 , C2H4, C2H2
Last Answer : Ans. C2H2 < C2H4 < C2H6
Description : Define bond order and give the relationship between bond order and bond length
Last Answer : Ans Bond order (b.o.) is defined as one half the difference between the number of electrons present in the bonding and the antibonding orbitals i.e., Bond order (b.o.) = ½ (Nb–Na) Bond order is inversely proportional to bond length
Description : For stable molecule the Value of bond order must be.... a) Negative b) Positive c) 0 d) There is no relationship between stability and bond order
Last Answer : b) Positive
Description : 33. The pair of species with the same bond order is (1) N2 , O2 (2) 2 O , B 2 2 (3) O , NO 2 (4) NO,
Last Answer : (2) 2 O , B 2 2
Description : 22. Bond order of 1.5 is shown by: (1) O2 (2) O2 (3) O2 (4) 2 O2
Last Answer : O2
Description : What happens when a chemical bond is formed? (1) energy is always absorbed (2) energy in always released (3) more energy is released than is absorbed (4) energy is neither released nor ... as potential energy. Upon the breaking of these bonds the energy is released thereby creating usable energy.
Last Answer : Silver nitrate solution is kept in brown bottles in laboratory because - (1) it reacts with ordinary white bottles (2) brown bottles stops the passage of light through it (3) brown bottles do not react with it (4) brown bottles react with it
Description : Which of the following statements about benzene is correct? (a) All of the carbon atoms are sp3 hybridized. (b) It has no delocalized electrons. (c) The carbon-carbon bond length is longer than that of ethane. (d) It is a planar molecule.
Last Answer : It is a planar molecule.
Description : Thiols are alcohol analogs in which the oxygen has been replaced by sulfur (e.g., CH3SH). Given the fact that the S-H bond is less polar than the O-H bond, which of the following ... (c) Hydrogen bonding forces would be the same. (d) No comparison can be made without additional information
Last Answer : Hydrogen bonding forces are weaker in thiols.
Description : Which of the following statements concerning SN2 reactions of alkyl halides is not correct? (a) The rate of reaction depends on the concentration of the nucleophile. (b) The rate of reaction depends on the ... carbon of the C-Br bond. (d) All alkyl iodides react more rapidly than all alkyl chlorides
Last Answer : All alkyl iodides react more rapidly than all alkyl chlorides
Description : Which of the following statements is correct for a saturated alkyl halide? (a) the C-X bond results from overlap of the s orbital of carbon and the p orbital of the halogen (X) (b) the C-X bond ... the C-X bond results from overlap of the sp2 orbital of carbon and the p orbital of the halogen (X)
Last Answer : the C–X bond results from overlap of the sp3 orbital of carbon and the p orbital of the halogen (X)
Description : Which of the following statements are correct concerning delocalized electrons? (a) Electrons do not belong to a single atom. (b) Electrons are not confined to a bond between two atoms (c) Electrons are shared by three or more atoms. (d) (a), (b) and (c)
Last Answer : (d) (a), (b) and (c)
Description : Which statement is correct? (a) Energy is released when a bond breaks. (b) A sigma bond results from attraction of protons and electrons. (c) Energy is released when a bond forms. (d) A carbanion is positively charged
Last Answer : Energy is released when a bond forms
Description : Why would an atheist, or group of atheists, go to such lengths to try and convince believers that God doesn't exist?
Last Answer : Why do you not ask the same question of theists?
Description : Why is it so hard for some people to imagine what incredible lengths they would go to to get something to eat, if they were literally starving to death?
Last Answer : Living in a country where obesity is rampant might have something to do with it.
Description : Why is it that when you fold your fingers down, they are all the same length, but when you put them straight up they are all different lengths?
Last Answer : Mine don’t. But can you touch your elbows behind your back?
Description : What's the nastiest or strangest thing you've ever pawed through; what are the greatest lengths you've ever gone to try to find or retrieve something of monetary or sentimental value that you've lost?
Last Answer : I’ve walked for miles to heal a wounded relationship.
Description : What lengths would you do to assure someone does not get on the roadway drunk?
Last Answer : I would be prepared to steal the distributor cap, or take the keys to drive the car and the person home myself. There is no excuse for drink driving, and it is irresponsible to let a friend do ... when a friend drink drives, you are putting their life at risk, as well as innocent road users.
Description : Non morning people: What’s the most extreme lengths you’ve gone to wake up early in the morning?
Last Answer : My go-to is always just staying up
Description : I have three colors, each with a different meaning. When I'm old they become dull, but when I'm new they are gleaming. I help keep people safe, but sometimes they hate me. You won't see me in a forest, ... get happy or sad, and when you guess what I am, you will be very glad. What am I? -Riddles
Last Answer : A Stoplight.
Description : If the lengths of the sides of a triangle are in the ratio 6:11:15 and it's perimeter is 96cm , then the height corresponding to the longest side is -Maths 9th
Last Answer : LET EACH SIDE BE X 6X+11X+15X=96 32X=96 X=3 SIDES=6 3=18 11 3=33 15 3=45 AREA OF TRIANGLE BY HERONS FORMULA=S=96/2=48 WHOLE UNDERROOT 48 48-18 48-33 48-45 UNDERROOT=12 4 30 15 3 4 3 15ROOT2 180 ... bh/2 180root2=18 h/2 360root2=18h h=20 root2 But root 2=1.4(approx) h=20 1.4(approx) h=28cm(approx).
Description : If two sides of a triangle are of lengths 5 cm and 1.5 cm, then the length of third side of the triangle cannot be -Maths 9th
Last Answer : (d) Given, the length of two sides of a triangle are 5 cm and 1.5 cm, respectively. Let sides AB = 5 cm and CA = 1.5 cm We know that, a closed figure formed by three intersecting lines ( ... options (a), (b) and (c) satisfy the above inequality but option (d) does not satisfy the above inequality.
Description : Is it possible to construct a triangle with lengths of its sides as 4 cm, 3 cm and 7 cm ? -Maths 9th
Last Answer : No, it is not possible to construct a triangle with lengths of its sides as 4 cm, 3 cm and 7 cm because here we see that sum of the lengths of two sides is equal to third side i.e., 4+3 ... , the sum of any two sides of a triangle is greater than its third side, so given statement is not correct.
Description : Construct a rectangle whose adjacent sides are of lengths 5 cm and 3.5 cm. -Maths 9th
Last Answer : We know that, each angle of a rectangle is right angle (i.e., 90°) and its opposite sides are equal and parallel. To construct a rectangle whose adjacent sides are of lengths 5 cm and 3.5 cm, use the ... AD and CD. Thus, ABCD is the required rectangle with adjacent sides of length 5 cm and 3.5 cm.
Description : A rhombus whose diagonals are 4 cm and 6 cm in lengths. -Maths 9th
Last Answer : we know that , all sides of a rhombus are equal and the diagonals of a rhombus are equal and the diagonals of a rhombus are perpendicular bisectors of one another. So, to construct a rhombus whose diagonals are 4cm and 6cm ... ) From Eqs. (i) and (ii), AB = BC = CD = DA Hence , ABCD is a rhombus.
Last Answer : To construct a triangle ABC in which AB = 3.6 cm, AC = 3.0 cm and BC = 4. 8 cm, use the following steps. 1.Draw a line segment BC of length 4.8 cm. 2.From B, point A is at a distance of 3.6 ... 3.Joining BP, we obtain angle bisector of ∠B. 4.Flere, ∠ABC=39° Thus, ∠ABD = ∠DBC = 1/2 x 139° = 19.5°
Last Answer : We know that, all sides of a rhombus are equal and the diagonals of a rhombus are perpendicular bisectors of one another. So, to construct a rhombus whose diagonals are 4 cm and 6 cm use the following steps. 1.Draw ... B and D. 6.Now, join AB, BC, CD, and DA . Thus, ABCD is the required rhombus.
Description : Is it possible to construct a triangle with lengths of its sides 5cm, 3cm and 8cm? Give reason for your answer. -Maths 9th
Last Answer : Solution :- No, since sum of two sides is equal to third side. (5 cm + 3 cm = 8 cm)
Description : Is it possible to construct a triangle with lengths of its sides as 7 cm, 8 cm and 5 cm? Give reason for your answer. -Maths 9th
Last Answer : Solution :- Yes, because in each case sum of two sides is greater than the third side.