NTSE SAT Chemistry Papers 11

This is NTSE SAT Chemistry Papers 11.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

A drop each of two non-corrosive and non-irritating liquids A and B at a temperature of \({\text{22}}^\circ {\text{C}}\)are placed on the skin. Liquid A gives a more cooling sensation than liquid B. Which of the following can be said about the liquids A and B?

A
Liquid A has higher boiling point than that of liquid B
B
Liquid A has higher latent heat of vaporisation than that of liquid B
C
Liquid A has lower latent heat of vaporisation than that of liquid B
Correct
D
The boiling points of liquid A and B are equal

There is a mixture of three solid compounds A, B and C. Out of these compounds A and C are soluble in water and compound C is sublimable also. In what sequence the following techniques can be used for their effective separation? I. Filtration II. Sublimation III. Crystallisation from water extract IV. Dissolution in water

A
(IV), (I), (II), (III)
B
(II), (IV), (I), (III)
Correct
C
(I), (II), (III), (IV)
D
(II), (I). (IV), (Ill)

Which of the following is a suitable example for illustrating the law of conservation of mass? (Atomic mass of O = 16; H = 1)

A
18g of water is completely converted into vapour state on heating
B
18g of water is formed by the combination of 16g oxygen with 2g of hydrogen
Correct
C
18g of water freezes at \({\text{4}}^\circ {\text{C}}\)to give same mass of ice
D
18g of water in liquid state is obtained by heating 18g of ice.

An element X has 7 electrons in its L shell. What is true about the element X? I. It belongs to period 9 of modern periodic table. II. Its atom contains 9 protons. III. It has a valency of 7. IV. Its atoms can accept an electron to acquire noble gas configuration.

A
(II) and (IV)
Correct
B
(II) and (III)
C
(III) and (IV)
D
(I) and (II)

The reaction between carbon and oxygen can be represented as \({\text{C}}\left( {\text{s}} \right){\text{ }} + {\text{ }}{{\text{O}}_2}\left( {\text{g}} \right){\text{ }} \to {\text{ C}}{{\text{O}}_2}\left( {\text{g}} \right){\text{ }} + {\text{ heat}}\) In which of the following type(s), the above reaction can be classified? I. Combustion reaction II. Displacement reaction III. Endothermic reaction IV. Combination reaction

A
(I) and (IV)
Correct
B
(I), (III) and (IV)
C
(I) only
D
(I) and (III)

A metal carbonate X on treatment with a mineral acid liberates a gas which when passed through aqueous solution of a substance Y gives back X. The substance Y on reaction with the gas obtained at anode during electrolysis of brine gives a compound Z which can decolorise coloured fabrics. The compounds X, Y and Z respectively are

A
\({\text{ Ca(OH}}{{\text{)}}_2}{\text{, CaC}}{{\text{O}}_3}{\text{, CaOC}}{{\text{l}}_2}\)
B
\({\text{ CaC}}{{\text{O}}_3}{\text{, Ca(OH}}{{\text{)}}_2}{\text{, CaOC}}{{\text{l}}_2}\)
Correct
C
\({\text{CaC}}{{\text{O}}_3}{\text{, CaOC}}{{\text{l}}_2}{\text{, Ca(OH}}{{\text{)}}_2}\)
D
\({\text{Ca(OH}}{{\text{)}}_2}{\text{, CaO, CaOC}}{{\text{l}}_2}\)

A salt can be between produced by reaction A. a weak acid and weak base B. metal oxide and water C. metal and a mineral acid D. metal oxide and a mineral acid

A
D, A and B
B
B, C and D
C
A, B and C
D
C, D and A
Correct

Which of the following is true about the two statements? Statement I: Reactivity of aluminium decreases when it is dipped in nitric acid. Statement II: A protective layer of aluminium nitrate is formed when aluminium is dipped in nitric acid.

A
Both the statements are correct but II is not correct explanation of l
B
I is correct but II is incorrect
Correct
C
Both the statements are correct and II is also the correct explanation of I
D
I is incorrect but II is correct.

A silvery white metal X reacts with water at room temperature to produce a water soluble compound Y and a colourless gas Z. The reactions is highly exothermic and the Z catches fire immediately during the reaction. The solution of Y in water on reacting with stoichiometric amount of dilute solution of hydrochloric acid gives a solution of pH = 7.0. The compounds X, Y and Z respectively are:

A
\({\text{Na}},{\text{ NaOH and }}{{\text{H}}_2}\)
Correct
B
\({\text{K}},{\text{ KCl and }}{{\text{H}}_2}\)
C
\({\text{Al}},{\text{ Al}}{\left( {{\text{OH}}} \right)_3}{\text{ and }}{{\text{H}}_2}\)
D
\({\text{Ag}},{\text{ AgOH and }}{{\text{H}}_2}\)

A compound X is obtained by the reaction of alkaline \({\text{KMn}}{{\text{O}}_3}\)with another compound Y followed by acidification. Compound X also reacts with compound Y in presence of few drops of \({{\text{H}}_2}{\text{S}}{{\text{O}}_4}\) to form a sweet smelling compound Z. The compound X Y and Z are respectively.

A
Ethanol, Ethene, Ethanoic acid
B
Ethanoic acid, Ethanol, Ethylethanoate
Correct
C
Ethanol, Ethanoic Acid, Sodium Ethanoate
D
Ethanoic Acid, Ethanal, Ethene

Which of the following pairs of compounds of carbon will undergo combustion as well as addition reactions.

A
\({{\text{C}}_2}{{\text{H}}_2}{\text{ and }}{{\text{C}}_3}{{\text{H}}_6}\)
Correct
B
\({{\text{C}}_2}{{\text{H}}_4}{{\text{O}}_2}{\text{ and }}{{\text{C}}_3}{{\text{H}}_6}{\text{O}}\)
C
\({{\text{C}}_2}{{\text{H}}_6}{\text{O and }}{{\text{C}}_3}{{\text{H}}_8}{\text{O}}\)
D
\({\text{C}}{{\text{H}}_4}{\text{ and }}{{\text{C}}_2}{{\text{H}}_6}\)

An element X combines with hydrogen to form a compound\({\text{X}}{{\text{H}}_3}\). The element X is placed on the right side of the periodic table. What is true about the element X? A. Has valence electrons B. Is a metal and is solid C. Is a non-metal and is a gas D. Has a 5 valence electrons E. \({\text{X}}{{\text{H}}_3}\)reacts with water to form a basic compound

A
C, D and E
Correct
B
B, C and D
C
A, B and C
D
E, A and B

An element X (atomic number 12) reacts with another element Y (atomic number 17) to form a compound Z. Which of the following statements are true regarding this compound? I. Molecular formula of Z is \({\text{X}}{{\text{Y}}_2}\) II. It is soluble in water III. X and Y are joined by sharing of electrons IV. It would conduct electricity in the molten state.

A
(I), (III) and (IV)
B
(II) and (IV)
Correct
C
(II) and (III)
D
(I) and (III)

Which of the following are the correct examples of matter?

A
Silver foil, hot air and chalk
Correct
B
Air, wood and vacuum
C
Sand, oxygen and light flash
D
Glass bottle, water and noise

Two identical beakers labeled as (X) and (Y) contain 100 \(c{m^3}\) of water each at \({20^\circ }C\). To the water in the beaker (X) 100g of water at \({0^\circ }C\) was added and stirred to mix thoroughly. To the beaker (Y) 100g of ice at \({0^\circ }C\) was added and stirred till it melted into water. The water in the beaker (Y) will be

A
Heavier than water in beaker X
B
Lighter than water in better X
C
Hotter than water in beaker X
D
Colder than water in beaker X
Correct