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state the law of Octaves what was the limitations of  Dobereiner's classifications? what was the major limitation of Mendleeve's periodic table ? 2. name three elements whose atomic masses were corrected on the basis of their position in mendeleev's periodic table. 3.elements of group III A and V A in the Mendleev's Periodic table have the same general formula of their hydride's  (RH3). how are they placed in different groups in Mendeleev's periodic table ? 4. why did Mendleev's leave some gap in his periodic table? 5. in group VIII of periodic table, why does Cobalt with atomic mass 58.93 appear before Nickel having atomic mass 58.71 ? 6. (a) If we take Beryllium as the first element then which will be the eighth element from it according to Newland's law of Octaves ?     (b) Did Mendeleev include noble gasses in his periodic table? 7. (a) what physical and chemical  properties of elements were used by Mendeleev in creating his period

Short type question and answer for class 10th CBSE  1. What was the major limitation of Mendeleev’s periodic table?  2. Name three elements whose atomic masses were corrected on the basis of their position in Mendeleev’s periodic table. 3. Elements of group III A and V A in the Mendeleev’s periodic table have the same general formula of their hydride (RH3 ) How are they placed in different groups in Mendeleev’s periodic table?  4. Why did Mendeleev leave some gaps in his periodic table?  5. In group VIII of the periodic table, why does cobalt with atomic mass 58.93 appear before nickel having atomic mass 58.71?  . (a) If we take beryllium as the first element then which will be the eighth element from it according to Newland's law of octaves ?  (b) Did Mendeleev include noble gases in his periodic table?  6. (a) What physical and chemical properties ofelements were used by Mendeleev in creating his periodic table? (b) What were the two major

Very important for All bank exams like SBI, IBPS, RRB , SSC CG VYAPAM etc. Fill in the blanks with suitable form of the verbs given in brackets 1. He ............. to temple every day. (a) goes (b) is going 2. Pinky ............. to Allahabad last year. (a) has gone (b)  went 3. She ............ from jaundice for two months. (a) has suffered (b) has been suffering) 4. He ............. just now. (a) come (b) has come 5 I ............. reading for two hours. (a)have been (b) was 6. My brother ............. in Deoghar since 1990. (a) has lived (b) lived 7. Akbar ............. the Battle of Haldighati. (a) has won (b)  won 8. Who ............. the radio ? (a) has invented (b) invented 9. Rajeev Gandhi ............. in 1991. (a) died (b) has died 10. The mother ............. before the son came. (a) had died (b) died 11. The train had left before we ..... the station. (a) reached (b) had reached 12. I shall participate in the programme if fat

                        --ARTICLES-- Very important for IBPS, SBI, RRB, SSC, CG vyapam, CG PSC and various compititive exams  Q. Fill in the blanks with 'a' or 'an' where necessary 1. ...... animal cannot laugh and weep.  2. ...... horse does not eat flesh.  3. I saw ...... man of two heads.  4. Mr Verma is ...... typist.  5. She is ...... beauty.  6. Rice sells ten rupees ...... kilo.  7. My brother earns Rs. 5000 / ----month.  8. Fonty has ...... dozen pencils.  9. ...... great many people have come.  10. I bought one and half ...... kilo of sugar.  11. ...... few people are yet to come.  12. ...... little butter is left in the pot.  13. Such ...... fine flower !  14. What ...... excellent idea ! 15. He is ...... Dara Singh.  16. Sima is ...... Lata Mangeshkar of my town.  17. He is ...... honest and laborious man. 18. This is ...... costly and useful book.  19. .Mohan is . . .....peo

Insert or Remove A or An where necessary. 1 FIR has been lodged in this case.  2. Apple grows on tree.  3. COW is useful animal.  4. He bought a furniture.  5. Mohan gave me an information.  6. They will stay here for couple of days.  7. Ihave to cover ten and quarter miles a day. 8. Fifty miles is long distance.  9. Elephant has long trunk.  10. Poet and dramatist write differently. 11. Eggs sell fifteen rupees dozen.  12. His father is honorary magistrate 13. He has hundred rupees. 14. You cannot be Tendulkar.  15. A kindness is virtue.  16. I was invited to a dinner.  17. He was African by birth not European. 18. Try to come hour before the Class start 19. A brass is useful metal.  20. Mohan has pen in one hand and a paper in another hand  21. He wants some wood to make fire.  22. He is Vikramaditya in judgement.  23. They gave me an advice.  24. He wants a bread.  25. I hav

Class 10th CBSE Chemistry  Very important questions and answers for BOARD exam. Very short type question  1. What was the basis of classification of elements in the Mendeleev's periodic table. 2.Name the scientist who for the first time divided elements into metals and non-metals. 3. Name the three elements for which Mendeleev left gaps in the periodic table. 4 Name a group of elements which was not known at the time when Mendeleev  gave his periodic table . 5. Name an anomalous pair of elements in Mendeleev’s periodic table. 6 Name the missing elements in the triad of Li and K. 7. Which element was named as ‘Eka-silicon in Mendeleev’s periodic table? 8. Elements X and Y obey Newland’s Law of Octaves .How many elements are present between these two elements? 9. Name three alkali metals which form a Dobereiner triad? 10. Among the elements F, Cl, Br and I, which does not fit into the triad?              Answers 1. Atomic mass  2. Lavoisier  3

                          Modals Very important for Various compititive exams especially for IBPS, SBI, SSC, RRB etc. Q.  Fill in the blanks with given Modals " Need, Dare, Ought to and use to " 1. The scientists ........ Invent latest weapons for the safety of the country. 2. While I was a student I ........... walk 10 kilometers daily.  3. They are ........... gambling.  4. Where . .......... you to live earlier ?  5. You ........... not have joined here.  6. I ........... not go there. 7 You .......... not help him since he looks down upon you.  8. She ........... to have good manners.  9. I ........... say that you are a traitor.  10. Students ........... consult a dictionary to enrich their word power  11. He is a dishonest man he ........... not be respected.  12. Examinees ........... have laboured hard. 13. He has lived along the main road for many years so he is ........... noise.  14. .......