Science, asked by michaeljohnjohn85, 8 months ago

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Choose correct answer from the given alternatives and write it. [Each carries 1 Mark]

1) What is the chemical formula of marble ?

(B) CaCO
(D) Ca(OH)
(C) BaCO
(A) Na,CO

2) Which type of process is respiration ?

(A) Endothermic
(B) Exothermic
(C) (A) and (B) both
(D) None of these

3) Reaction of zinc with sulphuric acid gives zinc sulphate and Hydrogen. Which is the balancedequation for this chemical change ?

(B) Zn+2H,SO, 27nSO + H2
(A) Zn + H2sO4> ZnSO, + H2
(D) It is not given here
(C) 2Zn + HSO,> ZnSO, + 2H2

4) Which type of reactions are useful in black and white photography ?

(B) 2AgBr(s sunlight 2Agls)+Br,(g)
(A) 2AgCl()
(D) CaCO,) CaO()+ CO,(g)
(C) (A) and (B) both

5) If during any chemical reaction insoluble substance is produced in water then that reaction iscalled.. type of reaction.

(B) Double displacement
(C) Precipitation
(A) Combination
(D) Redox

6) MnO +4HCI MnCl2 + 2H,0 Cl, Give the type of reaction.

(A) Displacement
(B) Combination
(D) Redox
(C) Decomposition

7) If 10 g Hydrogen gas burns in more amount of air, what will be the mass of a rising water in it ?

(B) 45 g
(C) 10 g
(A) 90 g
(D) 18 g

8) Which is a reducing agent in reaction 30,(g)+ 2H,S(g) 2H,000+ 250,(g)

(D) SO
(A) O2
(B) H,O
(C) HS

9) Chemically, rusting is

(A) Hydrated ferrous oxide
(B) Ferric oxide
(C) Hydrated ferric oxide
(D) None of these

10) Silver articles are kept in open for long time, due to formation of which substance it becomesblack ?

(C) AgSo
(A) HS
(D) AgS
(B) Ags

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Answers

Answered by nagakalakoppalli

1) caco3

2) exothermic

3)no option

zn+ h2 so4 = znso4+ h2

4) a Agbr with sun light

5)c precipitation

6) I think redox reaction

7,8 questions are not clear

9)ferric oxide

10)HS

Answered by Anonymous

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