NTSE SAT Chemistry Papers 07

This is NTSE SAT Chemistry Papers 07 .. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

Examine the following statements and select the correct option. A. Electrolytic conduction is a a physical change.B. In Electrolytic conduction , positive as well as negative ions conduct electricity.

A
Both ‘A’ and ‘B’ are true
B
‘A’ is false but ‘B’ is true
Correct
C
Both ‘A’ and ‘B’ are false
D
‘A’ is true and ‘B’ is false

If metal ‘A’ displaces metal ‘B’ from it solution, it shows

A
Metal ‘A’ is not at all reactive compared to ‘B’
B
Metal ‘A’ is more reactive than metal ‘B’
Correct
C
Metal ‘A’ is equally reactive as metal ‘B’
D
Metal ‘A’ is less reactive than Metal ‘B’

The example for exothermic reaction is

A
melting of ice cubes
B
Cooking egg
C
decomposition of vegetable matter into compost
D
Baking bread
Correct

The chips manufactures usually flush bags of chips with this ‘gas’ to prevent the chips form being oxidized and become rancid.

A
Oxygen
B
Hydrogen
C
Chlorine
D
Nitrogen
Correct

The pH value of Gastric juice, Lemon juice, Milk of magnesia Sodium hydroxide solution respectively

A
2.2, 1.2, 10, 14
B
1.2,2.2,10,14
Correct
C
1.2, 2.2,14,10
D
2.2,1.2,14,10

Match the terms used in metallurgy with their meanings. Column I A. Roasting B. Calcination C. Gangue D. Flux Column II i. Heating the ore just below its melting point in the absence of air ii. Unwanted impurities present in the ore iii. Heating the ore just below its melting point in the presence of air iv. Process of increasing the percentage of desired component of the ore v. Substance added to ores ot remove unwanted impurities

A
A—i; B—iii; C—v; D—ii
B
A—i; B—iii; C—ii; D—v
C
A—iii; B—i; C—ii; D—v
Correct
D
A—iii; B—i; C—iv; D—ii

"The properties of elements are periodic functions of their atomic number " is given by

A
Mendeleev
B
Doberiener
C
Newlands
D
Moseley
Correct

Which of the statements about the reaction given below are incorrect?\({\text{2PbO(s) + C(s)}} \to 2{\text{Pb(s) + C}}{{\text{O}}_{\text{2}}}{\text{(g)}}\)1. Lead is getting reduced2. Carbon dioxide is gelling oxidized3. Carbon is getting oxidized4. Lead oxide is getting reduced

A
All
B
(i) and (iii)
C
(i) and (ii)
Correct
D
(i), (ii) and (iii)

Plaster of Paris is produced by heating gypsum in a kiln (furnace). The temperature at which it should be heated is :

A
173 K
B
373 K
Correct
C
473 K
D
273K

Which of the following will replace hydrogen from acids to form salts?

A
Na
Correct
B
P
C
S
D
O

Element x forms a chloride with formula \(XC{l_3}\)X would most likely be in the same group of the Periodic Table as:

A
Al
Correct
B
Mg
C
Si
D
Na

Which of the following will undergo substitution reaction?

A
\({C_2}{H_4}\)
B
\({C_3}{H_6}\)
C
\({C_3}{H_4}\)
D
None
Correct

Which of the following pairs will give displacement reactions?

A
NaCI solution and copper metal
B
\(MgC{l_2}\)solution and aluminum metal
C
\(AgN{O_3}\)solution and copper metal
Correct
D
\(FeS{O_4}\)solution and silver metal

A solution of \(CuS{O_4}\)was kept in an iron pot. After a few days. the iron pot was found to have a number of holes in it. Which of the following pots can be used for storing \(CuS{O_4}\)solution?

A
None
B
Silver pot
C
Both
Correct
D
Copper pot

A student was given three samples in test tubes I, II and III respectively. On dipping a pH paper in them, he observed that the colour of pH paper turned orange in test tube I, blue in lest tube II and green in test tube III. If arranged in decreasing order of their hydrogen ion \(\left( {{H^ + }} \right)\)concentration, the sequence of these test tubes would be:

A
I, II, III
B
I, III, II
Correct
C
II, III, I
D
III, I, II