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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 2801. |
The Law of Octaves was applicable only upto element ________. |
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Answer» The Law of Octaves was applicable only upto element ________. |
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| 2802. |
What do you mean by reactivity series? |
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Answer» What do you mean by reactivity series? |
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| 2803. |
When hydrogen in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical changes involved in the two cases. |
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Answer» When hydrogen in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical changes involved in the two cases. |
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| 2804. |
Some natural resources are given below. Classify them into the exhaustible and inexhaustible natural resources. Air, sunlight, oxygen, coal, natural gas, petroleum, minerals, forests. |
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Answer» Some natural resources are given below. Classify them into the exhaustible and inexhaustible natural resources. Air, sunlight, oxygen, coal, natural gas, petroleum, minerals, forests. |
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| 2805. |
What is the boiling point of acetic acid? |
| Answer» What is the boiling point of acetic acid? | |
| 2806. |
A white solid A when heated with sodium hydroxide solution, gives a pungent gas B, which turns red litmus blue. The solid, when dissolved in dilute nitric acid and treated with silver nitrate gives a white precipitate of C which is soluble in an ammonia solution.Identify A, B and C. Give equations to show the reactions involved. |
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Answer» A white solid A when heated with sodium hydroxide solution, gives a pungent gas B, which turns red litmus blue. The solid, when dissolved in dilute nitric acid and treated with silver nitrate gives a white precipitate of C which is soluble in an ammonia solution. Identify A, B and C. Give equations to show the reactions involved. |
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| 2807. |
23. An organic compound of carbon, hydrogen and nitrogen contains these elements having mass percentage 66.67%,7.41%and 25.92% respectively.What is the emperical formula? |
| Answer» 23. An organic compound of carbon, hydrogen and nitrogen contains these elements having mass percentage 66.67%,7.41%and 25.92% respectively.What is the emperical formula? | |
| 2808. |
The percentage of s character in sp3 hybridized orbital is: |
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Answer» The percentage of s character in sp3 hybridized orbital is: |
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| 2809. |
what is the composition of matera prima? |
| Answer» what is the composition of matera prima? | |
| 2810. |
Q. Write balanced chemical equations for the reactions taking place when dry crystals of copper sulphate are dropped into conc. sulphuric acid. [1 mark question](please give a detailed answer with the board marking scheme) |
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Answer» Q. Write balanced chemical equations for the reactions taking place when dry crystals of copper sulphate are dropped into conc. sulphuric acid. [1 mark question] |
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| 2811. |
find the value of r if 12Cr is maximum |
| Answer» find the value of r if 12Cr is maximum | |
| 2812. |
1. 0.45g of a metal M on heating in air increases in weight by 0.8g and oxide of formula MO is formed . The atomic weight of metal is about:- |
| Answer» 1. 0.45g of a metal M on heating in air increases in weight by 0.8g and oxide of formula MO is formed . The atomic weight of metal is about:- | |
| 2813. |
List 1 contains the metals/alloys (1, 2, 3, 4, 5) and list 2 contains their uses (A, B, C, D, E). List 1 Metal/Alloy List 2 Uses 1. aluminium 2. lead 3. brass 4. iron 5. zinc A. steel making B. aeroplane wings C. galvanizing D. radiation shield E. electrical fittings Copy and complete the following table write down the correct letter against the numbers representing metals.An answer may be used only once.The first has been done for you. Metal 1 2 3 4 5 Use B |
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Answer» List 1 contains the metals/alloys (1, 2, 3, 4, 5) and list 2 contains their uses (A, B, C, D, E).
Copy and complete the following table write down the correct letter against the numbers representing metals. An answer may be used only once. The first has been done for you.
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| 2814. |
why alkali reatcts with metal to liberate h2 gas.as seen in 2naoh+zn-na2ZnO2 + h2 |
| Answer» why alkali reatcts with metal to liberate h2 gas.as seen in 2naoh+zn-na2ZnO2 + h2 | |
| 2815. |
State true of falsea. Oxides of metals are alkaline in nature.b.Salt is acidicc.Metal corrodes due to saltsd.Salts are neutral. |
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Answer» State true of false a. Oxides of metals are alkaline in nature. b.Salt is acidic c.Metal corrodes due to salts d.Salts are neutral. |
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| 2816. |
What is a displacement reaction? |
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Answer» What is a displacement reaction? |
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| 2817. |
Complete the sentence by choosing correct words given in brackets.Electrolysis is the passage of __________ (electricity / electrons) through a liquid or a solution accompanied by a __________ (physical / chemical) change. |
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Answer» Complete the sentence by choosing correct words given in brackets. Electrolysis is the passage of __________ (electricity / electrons) through a liquid or a solution accompanied by a __________ (physical / chemical) change. |
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| 2818. |
Identify the correct molecular formula of sulphuric acid. |
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Answer» Identify the correct molecular formula of sulphuric acid. |
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| 2819. |
If the third virial coefficient of He is 4×10^{-2} then calculate the volume of 2 mole He at STP |
| Answer» If the third virial coefficient of He is 4×10^{-2} then calculate the volume of 2 mole He at STP | |
| 2820. |
The molecular formula of the given compound is |
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Answer» The molecular formula of the given compound is
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| 2821. |
Why is ferrous disulphide known as fool's gold? |
| Answer» Why is ferrous disulphide known as fool's gold? | |
| 2822. |
A crystalline salt Na2SO4.xH2O on heating loses 55.9 of its mass.what is the formula of crystal? |
| Answer» A crystalline salt Na2SO4.xH2O on heating loses 55.9 of its mass.what is the formula of crystal? | |
| 2823. |
Which of the following is an example of double displacement reaction? |
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Answer» Which of the following is an example of double displacement reaction? |
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| 2824. |
what is the definition of n factor common for all entities ? |
| Answer» what is the definition of n factor common for all entities ? | |
| 2825. |
Write 5 points of difference between ionic and covalent compound |
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Answer» Write 5 points of difference between ionic and covalent compound |
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| 2826. |
68. The maximum number of electron in a subshell with n=4 ,l=3,s=+1/2 is |
| Answer» 68. The maximum number of electron in a subshell with n=4 ,l=3,s=+1/2 is | |
| 2827. |
Why does hard water not produce foam with soap easily? |
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Answer» Why does hard water not produce foam with soap easily? |
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| 2828. |
Question 31. Match the acids given in Column I with their correct source given in Column II Column IColumn IIA. Lactic acid1. TomatoB. Acetic acid2. LemonC. Citric acid3. VinegarD. Oxalic acid4. Curd |
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Answer» Question 31. Match the acids given in Column I with their correct source given in Column II Column IColumn IIA. Lactic acid1. TomatoB. Acetic acid2. LemonC. Citric acid3. VinegarD. Oxalic acid4. Curd |
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| 2829. |
(a) What would you expect the pH of the pure water to be? (b) What colour would the universal indicator show in an aqueous solution of sugar? Why? (c) A sample of rainwater turned universal indicator paper yellow. What would you expect its pH to be? Is it a strong or a weak acid? |
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Answer» (a) What would you expect the pH of the pure water to be? (b) What colour would the universal indicator show in an aqueous solution of sugar? Why? (c) A sample of rainwater turned universal indicator paper yellow. What would you expect its pH to be? Is it a strong or a weak acid? |
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| 2830. |
Question 8 The boiling points of diethyl ether, acetone and n-butyl alcohol are 35∘C, 56∘C and 118∘C respectively. Which one of the following correctly represents their boiling points in kelvin scale? (a) 306 K, 329 K, 391 K (b) 308 K, 329 K, 392 K (c) 308 K, 329 K, 391 K (d) 329 K, 392 K, 308 K |
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Answer» Question 8 The boiling points of diethyl ether, acetone and n-butyl alcohol are 35∘C, 56∘C and 118∘C respectively. Which one of the following correctly represents their boiling points in kelvin scale? (a) 306 K, 329 K, 391 K (b) 308 K, 329 K, 392 K (c) 308 K, 329 K, 391 K (d) 329 K, 392 K, 308 K |
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| 2831. |
Which of the following is a suitable example for illustrating the law of conservation of mass? (Atomic mass of O = 16; H = 1) |
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Answer» Which of the following is a suitable example for illustrating the law of conservation of mass? (Atomic mass of O = 16; H = 1) |
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| 2832. |
ntEach of three metals x,y and z were put in turn into aqueous solution of the other two. x+ salt of y (or z)= y (or z) + salt of xn ntWhich one of the following observation is incorrectn nt1. y + salt of x=no action observedn nt2. y+ salt of z= z+ salt of yn nt3. z+ salt of x= x+ salt of zn nt4. z+ salt of y= no action observedn ntExplainn ntn |
| Answer» ntEach of three metals x,y and z were put in turn into aqueous solution of the other two. x+ salt of y (or z)= y (or z) + salt of xn ntWhich one of the following observation is incorrectn nt1. y + salt of x=no action observedn nt2. y+ salt of z= z+ salt of yn nt3. z+ salt of x= x+ salt of zn nt4. z+ salt of y= no action observedn ntExplainn ntn | |
| 2833. |
What are the types of covalent bonds? |
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Answer» What are the types of covalent bonds? |
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| 2834. |
Translate the following statement into chemical equation and then balance it:Hydrogen sulphide gas burns in air to give water and sulphur dioxide. |
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Answer» Translate the following statement into chemical equation and then balance it: Hydrogen sulphide gas burns in air to give water and sulphur dioxide. |
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| 2835. |
(a) What is the property of concentrated sulphuric acid which allows it to be used in the preparation of hydrogen chloride and nitric acid?(b) What property of hydrogen chloride is demonstrated when it is collected by downward delivery (upward displacement)?(c) Why is hydrogen chloride not collected over water? |
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Answer» (a) What is the property of concentrated sulphuric acid which allows it to be used in the preparation of hydrogen chloride and nitric acid? |
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| 2836. |
For As2S2 sol the increasing order of coagulating value with the following electrolytes isNaClMgCl2AlCl3 |
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Answer» For As2S2 sol the increasing order of coagulating value with the following electrolytes is NaCl MgCl2 AlCl3 |
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| 2837. |
Which of the following does not give H+ ions in aqueous solution? |
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Answer» Which of the following does not give H+ ions in aqueous solution? |
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| 2838. |
183 Calculate the ratio of change in the mass of the molecules of a gas to initial mass, if it's speed is reduced to half and the ratio of initial and final pressure is 3:4. |
| Answer» 183 Calculate the ratio of change in the mass of the molecules of a gas to initial mass, if it's speed is reduced to half and the ratio of initial and final pressure is 3:4. | |
| 2839. |
18. 2g of gasA introduced in a evacuated flask at 25C. the pressure of the gas is 1atm. now 3g of another gasB is introduced in the same flask so total pressure becomes1.5atm.the ratio of molecular mass of A and B |
| Answer» 18. 2g of gasA introduced in a evacuated flask at 25C. the pressure of the gas is 1atm. now 3g of another gasB is introduced in the same flask so total pressure becomes1.5atm.the ratio of molecular mass of A and B | |
| 2840. |
CuSO4 solution is treated separately with KCl andKI. In which case Cu2+ will be reduced to Cu+ |
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Answer» CuSO4 solution is treated separately with KCl and KI. In which case Cu2+ will be reduced to Cu+ |
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| 2841. |
The compound which reacts fastest with Lucas reagent at room temperature is: |
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Answer» The compound which reacts fastest with Lucas reagent at room temperature is: |
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| 2842. |
But why they react with all of them and what if they won't react |
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Answer» But why they react with all of them and what if they won't react |
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| 2843. |
Hyperol is |
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Answer» Hyperol is |
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| 2844. |
7. 20g of an acid furnishes 0.5 moles of hydronium ions in its aqueous solution. The weight of 1g equivalent of the acid will be? |
| Answer» 7. 20g of an acid furnishes 0.5 moles of hydronium ions in its aqueous solution. The weight of 1g equivalent of the acid will be? | |
| 2845. |
What is an antacid |
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Answer» What is an antacid |
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| 2846. |
62 Difference b/w rhombic and monoclonic sulfur |
| Answer» 62 Difference b/w rhombic and monoclonic sulfur | |
| 2847. |
Write a balanced chemical reaction between calcium hydroxide and HCl. |
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Answer» Write a balanced chemical reaction between calcium hydroxide and HCl. |
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| 2848. |
A soap solution was added to the given water samples:- A- distilled water, B- underground water and C- distilled water and CaSO4. Which of the given water sample will produce maximum foam and which will give rise to scum? |
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Answer» A soap solution was added to the given water samples:- A- distilled water, B- underground water and C- distilled water and CaSO4. Which of the given water sample will produce maximum foam and which will give rise to scum? |
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| 2849. |
why does explosion takes place when we add water into acid ? but explosion doesn't take place when we add acid into water? |
| Answer» why does explosion takes place when we add water into acid ? but explosion doesn't take place when we add acid into water? | |
| 2850. |
39.The volumes of ozone and chloride diffusing during the sane timeare 35 ml and 29 ml respectively. If the molecular weight of chlorine is 71. Calculate molecular mass of ozone. |
| Answer» 39.The volumes of ozone and chloride diffusing during the sane timeare 35 ml and 29 ml respectively. If the molecular weight of chlorine is 71. Calculate molecular mass of ozone. | |
