Focus Guide for 11th Chemistry

Focus Guide for 11th Chemistry. We covered all the Focus Guide for class 11th Chemistry pdf free download English medium MCQs in this post for free so that you can practice well for the exam.

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Focus Guide for 11th Chemistry Objective for Students

Ozone is an ......... of oxygen:

(a) Allotrope.

(b) Isotope.

(c) Isobar.

(d) Isotone.

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The process of losing electrons is known as .......

(a) Oxidation.

(b) Reduction.

(c) Radiation.

(d) Both oxidation and reduction.

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Anions are formed by .......

(a) Losing of electrons.

(b) Gaining of electrons.

(c) Gaining of neutrons.

(d) Losing of neutrons.

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Which one of the following Thermal is a bad Conductor?

(a) Aluminium.

(b) Copper.

(c) Glass.

(d) Silver.

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Rusting is .......

(a) Electrolysis.

(b) Oxidation.

(c) Redox reaction (Oxidation and Reduction).

(d) Reduction.

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Which of the following gases is heavier than oxygen?

(a) Carbon dioxide.

(b) Ammonia.

(c) Methane.

(d) Helium.

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Which among the following is an example of solid sol?

(a) Milk of magnesia.

(b) Foam.

(c) Coloured gemstones.

(d) Rubber.

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The process of gaining electrons is known as ....

(a) Oxidation.

(b) Reduction.

(c) Radiation.

(d) Both oxidation and reduction.

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Which of the following metals (shown by its symbol) is generally used for making filaments of a bulb?

(a) Fe.

(b) Au.

(c) Ag.

(d) W.

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Which of the following bonds are weakest in nature?

(a) Single bond.

(b) Double bond.

(c) Triple bond.

(d) Hydrogen bond.

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The rotary kiln rotates

1. 10-20 turns per hour

2. 20-40 turns per hour

3. 30-60 turns per hour

4. 60-100 turns per hour

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Which slowly allows the charge in to the cylinder

1. Hopper

2. Burner

3. Screw conveyer

4. None of these

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During passage of charge in the cylinder it loses in the beginning

1. Water

2. Carbon dioxide

3. Carbon monoxide

4. Sulphur dioxide

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At the burning end of the kiln the temperature is around

1. 1000-1100°C

2. 1100-1500°C

3. 1500-1700°C

4. 1700-1900°C

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Cement is a mixture of :

1. Sodium silicate and gypsum

2. Calcium silicates and calcium aluminates

3. Sand, clay and felspar

4. Calcium carbonate and sand

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Gray hard balls of cement is called

1. Clinker cement

2. Portland cement

3. Absolute cement

4. Zypsum cement

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Cement consists zypsum

1. 10-15%

2. 1-2%

3. 2-3%

4. 3-6%

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Glass is a substance

1. crystalline

2. non crystalline

3. amorphous

4. (2) and (3)

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Glass is a ……..

1. not a true solid

2. frozen liquid

3. super cooled liquid

4. all the above

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Glass is a mixture of

1. Calcium sillicates and calcium alluminates

2. Sodium silicate and calcium silicate

3. Sodium silicate, calcium silicate and sand

4. Sodium silicate and sand

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Fine powder of Soda ash, lime stone, and sand called

1. Cullet

2. Batch

3. Charge

4. raw meal

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Cullet is :

1. Broken glass

2. Liquefied glass

3. Super cooled glass

4. None of these

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Raw materials used for glass are heated to

1.500°C

2. 1000°C

3. 1500°C

4. 2000°C

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The impurities called in glass Industry

1. Cullet

2. Batch

3. Glass-gall

4. None of these

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What is the use of adding cullet to the raw materials of glass?

1. Helps in lowering the melting temperature of raw material

2. Helps in increasing the melting temperature of raw material

3. Helps in increasing the quantinty of glass

4. None

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The process of cooling liquid glass is called

1. Pelverisation

2. Polymerization

3. Annealing

4. Hydrogenation

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Annealing strengthens the

1. cement

2. polymer

3. ceramic

4. glass

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Different kinds of glasses are obtained by varying the composition of

1. Cullet

2. Metal oxide

3. Batch

4. None of these

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The glass used for window glass is

1. Pyrex glass

2. Soda glass

3. Quartz glass

4. Flint glass

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The glass used for optics is

1. Quartz galss

2. Flint glass

3. Boro silicate glass

4. Soft glass

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The glass used for laboratory glass ware is

1. pyrex glass

2. borosilicate glass

3. flint glass

4. both (1) and (2)

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Which of the following can be used in making electrical bulbs

1. Soda glass

2. Pyrex glass

3. Quartz glass

4. Hard glass

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Metal oxides or metal salts are added to liquid glass to get

1. Colourless glass

2. Colour glass

3. Condensed glass

4. Brittle glass

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Addition of copper sulphate to glass gives which colour?

1. Yellow

2. Red

3. Blue

4. Purple

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Addition of cupric oxide to glass gives which colour?

1. Red

2. Green

3. Orange

4. Brown

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The most significant form of energy currency in living organisms is the bond energy present in

(A) carbonic acid

(B) ribonucleic acid

(C) adenosine triphosphate

(D) deoxyribonucleic acid

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Assertion: The living state is a non-equilibrium steady state. Reason: Living beings need to carry out work incessantly.

(A) Both assertion and reason are true and the reason is the correct explanation of the assertion

(B) Both assertion and reason are true but the reason is not the correct explanation of assertion.

(C) The assertion is true but the reason is false.

(D) Both assertion and reason are false.

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Identify the nucleic acids that behave like enzymes.

(A) Co-enzymes

(B) Ribozymes

(C) Co-factors

(D) Hormones

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Which of the following does NOT alter the activity of the enzyme?

(A) Changed substrate concentration

(B) Optimum pH

(C) High temperature

(D) Binding of inhibitors to enzyme

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Which of the following are often used in the control of bacterial pathogens?

(A) Competitive inhibitors

(B) Apozymes

(C) Lyases

(D) Ribozymes

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From the following identify the INCORRECT statement regarding cellulose.

(A) Plant cell walls are made of cellulose.

(B) Starch is a variant of cellulose.

(C) It is a homopolymer.

(D) They are the storehouse of energy in plant tissue.

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Identify the structure that is absolutely necessary for the biological activities of proteins.

(A) Primary

(B) Secondary

(C) Tertiary

(D) Quaternary

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The distance between two consecutive base pairs in a dsDNA is

(A) 34 Å

(B) 3.4 Å

(C) 3.6 Å

(D) 10 Å

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Complete the analogy. Carbohydrate: Glycosidic bond:: Nucleic acid: ……..

(A) lonic bond

(B) Phosphodiester bond

(C) Peptide bond

(D) Covalent bond

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Which of the following is responsible for changing the structure of amino acids, in solutions of different pH?

(A) The presence of an H atom

(B) Ionizable nature of-NH₂ and COOH groups

(C) Presence of a - carbon atom

(D) Presence of R-functional groups

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Identify the most abundant protein in the animal world.

(A) Insulin

(B) Cellulose

(C) Collagen

(D) RuBisCo

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Assertion: Iodine does not form a blue-colored complex with cellulose. Reasons: Cellulose forms a complex helical structure.

(A) Both assertion and reason are true and the reason is the correct explanation of assertion.

(B) Both assertion and reason are true but the reason is not the correct explanation of assertion.

(C) The assertion is true but the reason is false.

(D) Both assertion and reason are false.

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Identify the elements that are present at a higher concentration in the living matter as compared to non-living matter.

(A) Oxygen and Nitrogen

(B) Carbon and Hydrogen

(C) Phosphorous and Oxygen

(D) Sulphur and Nitrogen

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The term biomolecules refer to

(A) all the carbon compounds in living tissues.

(B) the total ash content obtained after drying of tissue.

(C) only inorganic compounds present in the acid-soluble fraction

(D) inorganic elements and compounds of living organisms.

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From the following identify the odd one out based on the general determinants of the chemical and physical properties of amino acids.

(A) Carboxyl group

(B) Amide group

(C) R functional group

(D) Amino group

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0.189 g of an organic compound gave 0.287 g of silver chloride by Carius method. Find the percentage of chlorine in the compound. (At. Mass of Ag = 108)

(A) 18.87%

(B) 37.57%

(C) 48.49%

(D) 57.75 %

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0.185 g of an organic compound produced 0.319 g of AgBr by Carius method. Find the percentage of bromine in the compound (At. Mass of Ag = 108, Br = 80)

(A) 23.37%

(B) 47.74%

(C) 73.77%

(D) 88.87%

Show Answer

In the structure of 4-isopropyl-2,4,5-trimethylheptane, number of 1°, 2° and 3° hydrogens are …….. respectively

(A) 18, 6, 2

(B) 21,4,3

(C) 18,4, 3

(D) 21,5,4

Show Answer

Glycerol is purified by distillation under reduced pressure, because ………

(A) it is stabilized by intra-molecular hydrogen bonding

(B) it has high molecular mass

(C) it is viscous

(D) it decomposes at its boiling point

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1.5 g of an organic compound in a quantitative determination of phoshorous gave 2.5 g of Mg2P2O7. Calculate the percentage of phosphorous in the compound. (Mg = 24, P = 31)

(A) 15.57%

(B) 31.14%

(C) 46.55%

(D) 62.28%

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In Kjeldahl's method, CuSO4 acts as a ……….

(A) reducing agent

(B) oxidising agent

(C) dehydrating agent

(D) catalyst

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The geometrical shape of carbocation is ……….

(A) linear with one lone pair of electrons

(B) trigonal planar with empty unhybridized p-orbital

(C) planar with unhybridized orbital containing unpaired electron

(D) tetrahedral with sp³ hybrid orbital containing lone pair of electrons.

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Salicylaldehyde is separated from p-hydroxybenzaldehyde using ……….

(A) column chromatography

(B) distillation in vacuum

(C) steam distillation

(D) crystallization

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0.25 g of an organic compound gave 0.35 g of BaSO4. Find the percentage of sulphur in the compound. (Ba = 137, S = 32)

(A) 19.23%

(B) 37.04%

(C) 55.40%

(D) 74.09%

Show Answer

In Dumas method, 0.5 g of an organic compound gave 35 mL of nitrogen at STP. The percentage of nitrogen is ………

(A) 10.25

(B) 8.75

(C) 5.64

(D) 12.24

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An electrophilic reagent must have ……….

(A) completely filled atomic orbitals

(B) vacant orbital

(C) an orbital containing one electron

(D) an orbital containing two electrons

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The CI-C-Cl angle in 1,1,2,2-tetracholoroethene and tetrachloromethane are ………. respectively.

(A) 120° and 109.5°

(B) 90° and 109.5⁰

(C) 109.5° and 90°

(D) 109.5° and 120⁰

Show Answer

During nitrogen estimation of an organic compound by Kjeldahl's method, the ammonia evolved by 0.4 g of the compound is neutralized by 8 mL of IM H₂SO4. Calculate the percentage of nitrogen in the compound.

(A) 84 %

(B) 32%

(C) 20%

(D) 56%

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In which of the following molecules C-atom is present in both sp and sp' states?

(A) Ethane

(B) 1,3-Butadiene

(C) Acetonitrile

(D) Propan-2-one

Show Answer

A certain organic compound was found to contain 33.8% C, 5.6% H and 49.6% chlorine. Find the empirical formula of the organic compound.

(A) C5H8Cl₂O

(B) C5H5Cl5O

(C) C4H6Cl4O

(D) C4H8Cl₂O

Show Answer

Which of the following is INCORRECT statement?

(A) Inductive effect implies the atoms ability to cause bond polarization.

(B) Resonance structures of molecule do not have identical arrangement of atoms.

(C) Electromeric effect involves temporary displacement of electrons.

(D) Hypercojugation is known as no-bond resonance.

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Number of hyperconjugation structures shown by isopropyl cation are ………

(A) four

(B) nine

(C) six

(D) three

Show Answer

Identify the INCORRECT statement w.r.t. Kjeldahl's method of nitrogen estimation.

(A) Presence of nitrogen in isoquinoline can be estimated.

(B) Potassium sulphate is used as boiling point elevator for H₂SO4.

(C) Copper sulphate acts as a catalyst.

(D) Nitrogen is first converted into ammonium sulphate.

Show Answer

Which of the following statements is CORRECT?

(A) Alkyl free radical has a planar structure.

(B) Carbanion has a pyramidal structure.

(C) Carbocation has a trigonal planar structure.

(D) All of these.

Show Answer

How many sigma and pi-bonds are present in the molecule of 1,2-dicyanoethene?

(A) 3 sigma and 3 pi

(B) 5 sigma and 2 pi

(C) 7 sigma and 5 pi

(D) 2 sigma and 3 pi

Show Answer

0.25 g of an organic compound was analyzed nitrogen by Dumas method. 32.9 mL of for moist nitrogen was collected at 25° C and 755.8 mm of Hg pressure. Calculate the percentage of nitrogen in the sample. (Aq. tension of water at 25° C is 23.8 mm of Hg)

(A) 45.5%

(B) 20.05%

(C) 14.5%

(D) 33.3 %

Show Answer

Empirical formula of an organic compound having molecular mass 60 is CH₂O. What is its molecular formula?

(A) C4H8O4

(B) C₂H4O₂

(C) C3H6O3

(D) C6H12O6

Show Answer

Find the CORRECT decreasing order of -I effect with reference to hydrogen.

(A) - NO₂>-COOH>-F>- CN

(B) -COOH > NO₂>-F> - CN

(C) - F>-CN>-COOH > NO₂

(D) -NO₂>-CN>-COOH > - F

Show Answer

Which of the following compounds have sp hybridized carbon atom? i. CH₂ = C = CH₂ ii. CH₂=CH-CN iii. CH, – CH = CH, iv. O=CH,

(A) (i) (iv)

(B) (ii)

(C) (ii) (iii)

(D) (i) (ii)

Show Answer

Kjeldahl's method CANNOT be used for the estimation of nitrogen in ……… i. C6H5-N=N-C6H5 ii. C6H5CONH2, C5H5N iv. C6H5NO₂

(A) (i), (ii)

(B) (ii), (iii)

(C) (i), (iii), (iv)

(D) (ii), (iv)

Show Answer

In ………. chromatography, both stationary and mobile phases are liquid.

(A) column

(B) paper

(C) thin layer

(D) both (A) and (B)

Show Answer

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