NTSE SAT Chemistry Papers 13

This is NTSE SAT Chemistry Papers 13.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

How many sub-atomic particles are present in an \(\alpha \)–particles used in Rutherford’s scattering experiment?

A
No. of protons – 4, No. of neutrons – 0, No. of electrons – 0
B
No. of protons – 2, No. of neutrons – 2, No. of electrons – 1
C
No. of protons – 2, No. of neutrons – 2, No. of electrons – 0
Correct
D
No. of protons – 2, No. of neutrons – 0, No. of electrons – 2

A certain sample of element Z contains 60% of \({}^{69}Z\) and 40% of \({}^{71}Z\). What is the relative atomic mass of element Z in this sample?

A
69.8
Correct
B
69.2
C
70.0
D
70.2

Compound A on strong heating in a boiling tube gives off reddish brown fumes and a yellow residue with a few drops of sodium solution, a white precipitate appeared. Identify the cation and anion present in the compound A.

A
Lead (II) and nitrate
Correct
B
Copper (II) and nitrate
C
Zinc and sulphate
D
Lead (II) and chloride

A substance A reacts with another substance B to product C and a gas D. If a mixture of the gas D and ammonia is passed through an aqueous solution of C, baking soda is formed. The substances A and B are

A
\({\text{N}}{{\text{a}}_2}{\text{C}}{{\text{O}}_3}\)and \({{\text{H}}_2}{\text{O}}\)
B
HCl and \({\text{N}}{{\text{a}}_2}{\text{C}}{{\text{O}}_3}\)
Correct
C
Na and HCl
D
HCl and NaOH

A metal occurs in nature as its ore X which on heating in air converts to Y. Y with unreacted X to give the metal. The metal is

A
Fe
B
Zn
C
Hg
D
Cu
Correct

Assertion (A): Nitrate ores are rarely available Reason (R): Bond dissociation energy of nitrogen is very high

A
Both A and R is false
B
A is correct and R is false
C
Both A and R are correct but R is not the correct explanation of A
D
Both A and R are true and R is the correct explanation of A
Correct

The number of structural isomers of the compound having molecular formula \({C_4}{H_9}Br\) is

A
2
B
5
C
4
Correct
D
3

The total number of electrons and the number of electros involved in the formation of various bonds present in one molecule of propanal \(\left( {{C_2}{H_5}CHO} \right)\) are respectively.

A
32 and 20
Correct
B
32 and 18
C
24 and 20
D
24 and 18

Consider following as a portion of the periodic table from Group No. 13 to 17. Which of the following statement/s is/are true about the elements shown in it? (I) Atomic size of Y is greater than that of W (II) Atomic size of W is smaller than that of X (III) V, W, Y and Z are less electropositive than X (IV) V, W, X and Y are more electronegative than Z

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

A brown and bright element ‘x’ when heated in presence of air turns in to black substance ‘y’. If Hydrogen gas is passed over this heating material again ‘x’ is obtained ‘x’ ad ‘y’ are

A
S and \(S{O_2}\)
B
C and \(C{O_2}\)
C
Na and NaH
D
Cu and CuO
Correct

Element ‘x’ which is solid and having high melting point, form a Chloride \('x\,\,C{l_3}'\). The element ‘x’ would be in which group of Periodic table-

A
Si
Correct
B
Mg
C
Na
D
Al

An element A belongs to third period and second group of periodic table. The number of valence electron / electrons of element A is

A
Four
B
Two
Correct
C
One
D
Three

Number of molecules in 14 g of carbon monoxide is

A
\(6.022 \times {10^{23}}\)
B
\(3.011 \times {10^{23}}\)
Correct
C
\(12.044 \times {10^{23}}\)
D
\(1.5050 \times {10^{23}}\)

______________ are alloys of Iron, Aluminium, Nickel and Cobalt

A
Alnicos
Correct
B
Brass
C
Bronze
D
Solder

The constituent present in baking powder is:

A
Sodium lactate
B
Sodium benzoate
C
Tartaric acid
Correct
D
Acetic acid