Saved Bookmarks
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.
| 2851. |
Question 4 (b)Write the chemical formulae of the following:(b) Calcium oxide |
|
Answer» Question 4 (b) Write the chemical formulae of the following: (b) Calcium oxide |
|
| 2852. |
Four main oxides present in ordinary portland cement are : CaO, Al2O3, SiO2 and Fe2O3. Identify the correct ascending order of their proportions in a typical composition of OPC. |
|
Answer» Four main oxides present in ordinary portland cement are : CaO, Al2O3, SiO2 and Fe2O3. Identify the correct ascending order of their proportions in a typical composition of OPC. |
|
| 2853. |
2nd most abundant molecule in human body in terms of percentage of number of atoms is what |
| Answer» 2nd most abundant molecule in human body in terms of percentage of number of atoms is what | |
| 2854. |
What do you mean by ionizable hydrogen atoms? |
|
Answer» What do you mean by ionizable hydrogen atoms? |
|
| 2855. |
Calculate the pH of N/1000 NaOH solution assuming complete ionisation |
| Answer» Calculate the pH of N/1000 NaOH solution assuming complete ionisation | |
| 2856. |
State your observation for the following cases:(i) Moist blue litmus is introduced into a gas jar of sulphur dioxide.(ii) Dry red rose petals are placed in the jar of sulphur dioxide.(iii) Paper soaked in potassium permanganate solution is introduced into a gas jar of sulphur dioxide. |
|
Answer» State your observation for the following cases: |
|
| 2857. |
A solution of ethanol in water is 10 % by volume. If the solution and pure ethanol have densities of 0.9866 g/cc and 0.785 g/cc respectively. The percent by weight is nearly ? 1) 7.95 % 2) 17 % 3) 9.86 % 4) 16.2 % |
| Answer» A solution of ethanol in water is 10 % by volume. If the solution and pure ethanol have densities of 0.9866 g/cc and 0.785 g/cc respectively. The percent by weight is nearly ? 1) 7.95 % 2) 17 % 3) 9.86 % 4) 16.2 % | |
| 2858. |
Addition of which substance turn a hydrocarbon pink and how? |
| Answer» Addition of which substance turn a hydrocarbon pink and how? | |
| 2859. |
Question 82 (ii) In her Science class, Jyoti learned that the atomic weight of Helium is 4.0030; of Hydrogen is 1.0080; and of Oxygen is 16.0000. Find the difference between the atomic weight of: Oxygen and Helium |
|
Answer» Question 82 (ii) In her Science class, Jyoti learned that the atomic weight of Helium is 4.0030; of Hydrogen is 1.0080; and of Oxygen is 16.0000. Find the difference between the atomic weight of: Oxygen and Helium |
|
| 2860. |
Calcium carbonate decomposes on heating according to the equation: CaCO3(s)⟶CaO(s)+CO2 At STP, the volume ofCO2 obtained by thermal decomposition of 50g ofCaCO3 will be: |
|
Answer» Calcium carbonate decomposes on heating according to the equation: CaCO3(s)⟶CaO(s)+CO2 At STP, the volume ofCO2 obtained by thermal decomposition of 50g ofCaCO3 will be: |
|
| 2861. |
Which bond is formed between carbons in ethene? |
|
Answer» Which bond is formed between carbons in ethene? |
|
| 2862. |
Question 08.Which of the following gives the correct increasing order of acid strength?(a) Water < Acetic Acid< Hydrochloric Acid(b) Water < Hydrochloric Acid < Acetic Acid(c) Acetic Acid < Water < Hydrochloric Acid (d) Hydrochloric Acid < Water < Acetic Acid |
|
Answer» Question 08. |
|
| 2863. |
In an atom, which has 2K, 8L, 18M, 2N electons in the ground state. The total no. og electrons having magnetic quantum no. m÷0 |
| Answer» In an atom, which has 2K, 8L, 18M, 2N electons in the ground state. The total no. og electrons having magnetic quantum no. m÷0 | |
| 2864. |
Which metal is refined by Van-Arkel method? |
|
Answer» Which metal is refined by Van-Arkel method? |
|
| 2865. |
Red precipitate is obtained when e†an ol solution of dimethylglyoxime is added to ammoniacal Ni(11) which of the following statements is not true |
| Answer» Red precipitate is obtained when e†an ol solution of dimethylglyoxime is added to ammoniacal Ni(11) which of the following statements is not true | |
| 2866. |
22. Which of the following is most acidic in nature?(1) SO(2) Al2O3(3) CO(4) P2O5 |
| Answer» 22. Which of the following is most acidic in nature?(1) SO(2) Al2O3(3) CO(4) P2O5 | |
| 2867. |
What are the causes of depletion of ozone layer? Which diseases are likely to be caused if the ozone layer will become thinner? |
|
Answer» What are the causes of depletion of ozone layer? Which diseases are likely to be caused if the ozone layer will become thinner? |
|
| 2868. |
Which of the following salts will produce a minimum pH solution due to hydrolysis? (1) NaCl (2) NH_4CN (3) Na_2CO_3 (4) NH_4Cl |
| Answer» Which of the following salts will produce a minimum pH solution due to hydrolysis? (1) NaCl (2) NH_4CN (3) Na_2CO_3 (4) NH_4Cl | |
| 2869. |
1.An aqueous solution of lead nitrate is added to sodium sulphate. 2. Zinc sulphide pellets are added to an aqueous solution of HCL |
|
Answer» 1.An aqueous solution of lead nitrate is added to sodium sulphate. 2. Zinc sulphide pellets are added to an aqueous solution of HCL |
|
| 2870. |
Name a solution that will separate the components of the following mixtures:(a) Zn(OH)2 from Pb(OH)2(b) CaO from PbO(c) CuO from ZnO |
|
Answer» Name a solution that will separate the components of the following mixtures: (a) Zn(OH)2 from Pb(OH)2 (b) CaO from PbO (c) CuO from ZnO |
|
| 2871. |
The pH of 0.1M aqueous solutions of NaCl, CH3COONa and NH4Cl will follow the order |
|
Answer» The pH of 0.1M aqueous solutions of NaCl, CH3COONa and NH4Cl will follow the order |
|
| 2872. |
Write the molecular formulae and names of lower and higher homologous of C4H6. |
|
Answer» Write the molecular formulae and names of lower and higher homologous of C4H6. |
|
| 2873. |
Rock salt is an ore of one of the following metals. This metal is: (a) Mn (b) Na (c) Fe (d) Cu |
|
Answer» Rock salt is an ore of one of the following metals. This metal is: |
|
| 2874. |
for the given equation the change in entropy is positive or negative? WHY?Fe(400k)-------->Fe(300k) |
|
Answer» for the given equation the change in entropy is positive or negative? WHY? Fe(400k)-------->Fe(300k) |
|
| 2875. |
Electrovalent compounds have low melting pointlow boiling point Insoluble in polar solvent conduct electricity in fused state |
|
Answer» Electrovalent compounds have low melting point low boiling point Insoluble in polar solvent conduct electricity in fused state |
|
| 2876. |
Out of citric acid and dilute sulphuric acid which is stronger acid? State the reason also. |
|
Answer» Out of citric acid and dilute sulphuric acid which is stronger acid? State the reason also. |
|
| 2877. |
Complete the missing link for the given reaction:Amphoteric metal + Base → Salt + |
|
Answer» Complete the missing link for the given reaction: |
|
| 2878. |
why the boundary of an open systen is imaginory |
| Answer» why the boundary of an open systen is imaginory | |
| 2879. |
Oxidation of HCl with oxygen releases: |
|
Answer» Oxidation of HCl with oxygen releases: |
|
| 2880. |
Which halide has the highest melting point ? |
|
Answer» Which halide has the highest melting point ? |
|
| 2881. |
what are malachite, siderite, calamine ores ? |
| Answer» what are malachite, siderite, calamine ores ? | |
| 2882. |
A milkman adds a veery small amount of backing soda into fresh milk way???!!!! 2-whty does this milk take a long time to set as curd? |
|
Answer» A milkman adds a veery small amount of backing soda into fresh milk way???!!!! 2-whty does this milk take a long time to set as curd? |
|
| 2883. |
Give one example in each case. (a) Change which occurs on heating but can be reversed.(b) Change which occurs on heating but cannot be reversed.(c) Change which occurs on cooling but can be reversed.(d) Change which occurs on mixing two substances, but can be reversed.(e) Change which occurs on mixing two substances, but cannot be reversed. |
|
Answer» Give one example in each case. (a) Change which occurs on heating but can be reversed. (b) Change which occurs on heating but cannot be reversed. (c) Change which occurs on cooling but can be reversed. (d) Change which occurs on mixing two substances, but can be reversed. (e) Change which occurs on mixing two substances, but cannot be reversed. |
|
| 2884. |
According to Octate Rule, in the outermost shell there can be maximum 8 electrons. But what about the third shell or M-shell, which can occupy 18 electrons |
| Answer» According to Octate Rule, in the outermost shell there can be maximum 8 electrons. But what about the third shell or M-shell, which can occupy 18 electrons | |
| 2885. |
In C, N, O and F the electronegativity |
|
Answer» In C, N, O and F the electronegativity |
|
| 2886. |
When barium chloride solution is added to copper sulphate solution a white precipitate is produced along with copper chloride solution. Name the type of reaction involved. |
|
Answer» When barium chloride solution is added to copper sulphate solution a white precipitate is produced along with copper chloride solution. Name the type of reaction involved. |
|
| 2887. |
Plastic is a bad conductor of electricity, then how does it create a magnetic field around it? |
|
Answer» Plastic is a bad conductor of electricity, then how does it create a magnetic field around it? |
|
| 2888. |
What happens when nitric acid is added to egg shell? |
| Answer» What happens when nitric acid is added to egg shell? | |
| 2889. |
From the following elements: 4Be;9F;19K;20Ca (i) Select the element having one electron is the outermost shell. (ii) Two elements of the same group. Write the formula of and mention the nature of the compound formed by the union of 19K and element X (2, 8, 7). |
|
Answer» From the following elements: |
|
| 2890. |
34. By using con. H2SO4, what are the conditions for getting an alkene and for getting an ether? |
| Answer» 34. By using con. H2SO4, what are the conditions for getting an alkene and for getting an ether? | |
| 2891. |
If total 110 elements are present in periodic table then how many of them contain electron in f subshell |
| Answer» If total 110 elements are present in periodic table then how many of them contain electron in f subshell | |
| 2892. |
The conductance of 0.01N CH3COOH solution is 4.5×10^-4 ohm inverse. which is present in a tube having length 6cm and cs area 36cm square. The molar conductivity of the solution is |
| Answer» The conductance of 0.01N CH3COOH solution is 4.5×10^-4 ohm inverse. which is present in a tube having length 6cm and cs area 36cm square. The molar conductivity of the solution is | |
| 2893. |
In van der Waals’ equation of state for a non-ideal gas, the term that accounts for intermolecular forces is: |
|
Answer» In van der Waals’ equation of state for a non-ideal gas, the term that accounts for intermolecular forces is: |
|
| 2894. |
Find out strength of H2O2 solution in g/ml if its 12ml are completely neutralised by 15ml of N/10 NaO |
| Answer» Find out strength of H2O2 solution in g/ml if its 12ml are completely neutralised by 15ml of N/10 NaO | |
| 2895. |
What are the chemical properties of acids and bases ? |
|
Answer» What are the chemical properties of acids and bases ? |
|
| 2896. |
The sun's hot inner layers produce a fairly continuous spectrum of radiation, from infra-red to X-rays. When this radiation passes through the cooler outer layers, which are majorly composed of hydrogen (~91.2% of all atoms is hydrogen), some wavelengths get absorbed. Ignoring the other elements composing the outer layers and considering only hydrogen, can you guess the longest missing wavelength in the rainbows we see on Earth? |
|
Answer» The sun's hot inner layers produce a fairly continuous spectrum of radiation, from infra-red to X-rays. When this radiation passes through the cooler outer layers, which are majorly composed of hydrogen (~91.2% of all atoms is hydrogen), some wavelengths get absorbed. Ignoring the other elements composing the outer layers and considering only hydrogen, can you guess the longest missing wavelength in the rainbows we see on Earth? |
|
| 2897. |
Among the following , the species having square planar geometry for central atom are (a) XeF_4 (b) SF_4 (c) (NiCl_4)^{2-} (d) (PdCl_4)^{2-} (1) a & d (2) a & b (3) b & c (4) c & d |
| Answer» Among the following , the species having square planar geometry for central atom are (a) XeF_4 (b) SF_4 (c) (NiCl_4)^{2-} (d) (PdCl_4)^{2-} (1) a & d (2) a & b (3) b & c (4) c & d | |
| 2898. |
Give the names and formulae of (a) two acidic oxides, and (b) two basic oxides. |
|
Answer» Give the names and formulae of (a) two acidic oxides, and (b) two basic oxides. |
|
| 2899. |
By which of the following methods, H2O2 can't be synthesised? |
|
Answer» By which of the following methods, H2O2 can't be synthesised? |
|
| 2900. |
The successive members of a homologous series differ by a mass of ______amu.14 |
Answer» The successive members of a homologous series differ by a mass of ______amu.
|
|