Question

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66. The elements whose oxides can turn phenolphthalein solution pink are:
6.) Na and K
(b) K and c
(c) Na and S
(d) K and P
67. "Is malleable and ductile". This best describes :
f) a metal
(b) a compound
(c) a non-metal
(cl) a solution
68. One of the following is not a neutral oxide. This is :
( (exco
(b) H.O
(c) NO
(D-Na,o
69. A basic oxide will be formed by the element :
(6) s
(c) P
(d) Kr
70. An acidic oxide is produced by the element :
(a) Na
(b)
(c) Ca
71. You are given a solution of AgNO3. Which of the following do you think cannot displace Ag from AgNO3
solution ?
(a) Magnesium (6) Zinc
(c) Gold
(d) Copper
72. Out of aluminium, copper, calcium and tin, the most reactive metal is :
(a) aluminium
(b) copper
(c) tin
(d) calcium
73. The least reactive metal among the following is :
(a) sodium
(b) silver
(c) copper
(d) lead
74. An element X reacts with hydrogen, when heated, to form a covalent hydride H.X. IF HX has a smell of
rotten eggs, the element X is likely to be:
(a) carbon
(b) sulphur
(c) chlorine
(d) phosphorus
75. Out of the following oxides, the amphoteric oxide is :
(a) Fe2O3
(b) ALO3
(c) P.O.
(d) NO
76. The metals which can produce amphoteric oxides are :
(a) sodium and aluminium
(b) zinc and potassium
(c) calcium and sodium
(d) aluminium and zinc
77. An element X forms two oxides XO and XO2. The oxide XO is neutral but XO2 is acidic in nature. The
element X is most likely to be :
(a) sulphur
(b) carbon
(c) calcium
(d) hydrogen
78. The elements whose oxides can turn litmus solution blue are :
(a) carbon and sulphur
(b) sodium and carbon
(c) potassium and magnesium
(d) magnesium and sulphur
es​

Answer 1

Answer:

77. carbon

78. magnesium and sulfur

74. chlorine

please Mark as brainliest

Answer 2

Answer:

66. a) Na and S

67. f) a metal

68. d) Na, o

69. (d) krypton

70. (c) Ca

71. (d) copper

72.(a)aluminum

73. (d) lead

74. (b) sulphur

75.

Fe2O3

Explanation:

76. (d) aluminum and zinc

77. (a) sulphur

78. (a) carbon and sulphur