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Chemistry - Chemical Reactions and Equations

Avatto > > NTSE > > Practice Questions Ntse > > Chemistry > > Chemical Reactions and Equations

21. While preparing CO₂ in laboratory on which of the
following substances hydrochloric acid is poured? (NTSE Gujarat, Stage-I, 2015-16)

A
Pieces of zinc
B
Crystals of copper sulphate
C
Pieces of marble
D
Ammonium chloride

Answer
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Option : C
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22. KN0₃(s) when mixed with water then the
temperature of solution falls. This reaction is (NTSE Maharashtra, Stage-I, 2015-16)

A
Endothermic reaction
B
Exothermic reaction
C
Cooling reaction
D
Heating reaction

Answer
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Option : A
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23. Which of the following is not an example of single displacement reaction? (NTSE Maharashtra, Stage-I, 2015-16)

A
CuO + H₂→H₂0 + Cu
B
Zn + CuS0₄ → ZnS0₄ + Cu
C
AgN0₃ + NaCI ~ AgCI + NaN0₃
D
Zn + 2HCI → ZnCI₂ + H₂

Answer
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Option : C
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24. When in the blue solution of Copper sulphate, zinc strip is dipped, after sometime the colour changes to (NTSE Madhya Pradesh, Stage-I, 2015-16)

A
Pink
B
Green
C
Colourless
D
Remains blue

Answer
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Option : C
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25. Identify A and 8 in the following reaction

4NH₃ + 30₂ → A + 6H₂0
A + 0₂ → 8 (NTSE Chhattisgarh, Stage-I, 2015-16)

A
NO and N_2</sub
B
NO and H₂0
C
H₂O and NO
D
N₂ and NO

Answer
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Option : D
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Practice Questions Ntse

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