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Q1.Which of the
following is precipitation as well as double displacement reaction? a) NaOH + HNO3 → NaNO3+ H2O b) Cu + 2AgNO3 → Cu(NO3)2 + 2Ag c) 2Hg + O2 → 2 HgO d) FeCl3 + NH4OH → Fe(OH)3 + 3NH4Cl Ans: D |
Q2. Exposure
of silver chloride to sunlight for a long duration turns grey due to Which
among the following statement(s) is(are) true?
1. the
formation of silver by decomposition of silver chloride.
2. Sublimation of silver chloride.
3. Decomposition of chlorine gas from silver
chloride.
4. Oxidation
of silver chloride.
(a) Only 1 (b) 1 and 3 (c) 2 and 3 (d) Only 4
Ans: a
Q3.Dissolution
of sugar in water is a physical change. Physical changes are changes affecting
the form of a chemical
substance
but not its chemical composition
Fe2O3+2Al→Al2O3+2Fe
The above
reaction is an example of a-
(a)
combination reaction
(b) double
displacement reaction
(c)
decomposition reaction
(d)
displacement reaction
Ans : d
Q4.Which
of the following statements about the given reaction are correct?
3Fe(s)+4H2O(g)→Fe3O4(s)+4H2(g)
(i) Iron
metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidizing agent
(a) (i), (ii) and (iii)
(b) (iii) and (iv)
(c) (i), (ii) and (iv)
(d) (ii) and (iv)
Ans: C
Q5.A shiny -
brown substance X on heating in air turns black and a new compound Y is formed.
Name the substance X and black compound Y.If hydrogen gas passed over it changes
back to X
A X = Fe and
Y = FeO
B X = Cu and
Y = Cu(OH)2
C X = Cu and
Y = CuO
D X = Al and
Y = AlO3
Ans: C
Q6.Four
students A,B,C and D were asked to carry out a decomposition reaction. Each one
followed a different method as mentioned:
1: Heated an
aqueous solution of iron sulfate in a test tube.
2. Added Zn
granules to iron sulfate in a test tube and then heated the mixture.
3. Heated
crystals of iron sulfate in a test tube.
4. Heated
crystals of iron sulfate along with the copper sulfate crystals in a china
dish. The student who adopted the correct method is:
- 1
- 2
- 3
- 4
Ans: C
Q7.Three
beakers labelled as A, B and C each containing 25 ml of water were taken. A
small amount of NaOH, anhydrous CuSO4 and NaCl were added to
the beakers A, B and C respectively. It was observed that there was an increase
in the temperature of the solution contained in beakers A and B, whereas in
case of beaker C, the temperature of the solution falls. Which one of the
following statement(s) is (are) correct?
(i) In beakers A and B, exothermic process has occurred.
(ii) In beakers A and B, endothermic process has occuBftd.
(iii) In beaker C exothermic process has occurred.
(iv) In beaker C endothermic process has occurred.
(a) (i) only
(b) (ii) only
(c) (i) and (iv)
(d) (iv), (ii) and (iii)
Answer
Answer: c
Q8.Name the
products formed when iron filings are heated with dilute hydrochloric acid
(a) Fe (III) chloride and water
(b) Fe (II) chloride and water
(c) Fe (II) chloride and hydrogen gas
(d) Fe (III) chloride and hydrogen gas
Answer/
Explanation
Answer: d
Explaination: Reason: 2Fe + 6HCl → 2FeCl3 (Iron
(III) chloride) + 3H2
Q9.A dilute
ferrous sulphate solution was gradu¬ally added to the beaker containing
acidified permanganate solution. The light purple colour of the solution fades
and finally disap¬pears. Which of the following is the correct explanation for
the observation?
(a) KMnO4 is an oxidising agent, it oxidises FeSO4.
(b) FeSO4 acts as an oxidising agent and oxidises KMNO4.
(c) The colour disappears due to dilution; no reaction is involved.
(d) KMnO4 is an unstable compound and de-composes in presence
of FeSO4. to a colourless compound.
Answer
Answer: a
Q10.Burning
Magnesium ribbon is brought in the gas jar of carbon dioxide. Which of the
following is correct ?
(i) It keeps
on burning
(ii) It gets
extinguished
(iii)
Although CO2 is non-supporter of combustion but burning magnesium breaks CO2
into carbon and oxygen, oxygen helps in burning.
(iv) Carbon
dioxide is a supporter of combustion.
(a) (i) and
(iv)
(b) (i) and
(iii)
(c) (i) and
(ii)
(d) (iii) and
(iv)
Answer
Answer: b
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