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Chemistry Preparation for SAT

(29 Posts)

This thread is dedicated to preparation for Chemistry section of SAT (Subject).

Question should not exceed 100 characters.Use add options for multiple choice questions and "Uploadimage/Add related data" for passage text papers.
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Harshit
Shared from SAT Subject (Chemistry) - 4 on Sep 28, 2020 11:48 AM

Zn + H2SO4 ZnSO4 + H2 (Laboratory preparation of hydrogen)

Why are zinc granules containing copper as impurity preferred for this reaction?

 
Because copper makes the reaction less violent.
Because copper acts as catalyst.
Because copper limits the rate of reaction.
Because copper allows easy collection of hydrogen gas.
Because copper makes reaction explosive.
Please type your answer before submitting.

If copper is speeding up the rate of reaction, why is it an impurity ?

Harshit
Shared from SAT Subject (Chemistry) - 4 on Sep 28, 2020 11:44 AM

Consider the following statements about a chemical change and choose which of the following are correct?
(i) It is a permanent change.
(ii) It results in the formation of a new substance.
(iii) The mass of individual substances remains constant during a chemical change.
(iv) It is a reversible change.

 
i, ii and iii
ii, iii and iv
i, ii and iv
I, iii and iv
None of these
Please type your answer before submitting.

Can someone explain this question ? How are chemical changes reversible ?

Harshit
Shared from SAT Subject (Chemistry) - 4 on Sep 28, 2020 11:44 AM

Which of the following observations is detected during catalytic oxidation of ammonia?

 
Reddish brown vapours are obtained.
Dirty green precipitates are obtained.
Pale blue coloured liquid is obtained.
White coloured precipitates are obtained.
No reaction takes place.
Please type your answer before submitting.

Can someone explain this question ? Question is asking about ammonia, but in answer, talking about oxidation of nitric oxide ?

Harshit
Shared from SAT Subject (Chemistry) - 4 on Sep 28, 2020 11:43 AM

Out of the following which is the absolute zero temperature(in °C)?

 
- 273
- 273.5
273
273.5
-273.15
Please type your answer before submitting.

Can someone explain this question ? K = C 273.15

Harshit
Shared from SAT Subject (Chemistry) - 4 on Sep 28, 2020 11:42 AM

Directions: The question below consists of two statements. Each statement in the left-hand column is referred to as I, and each statement in the right-hand column as II. For each question, determine whether I is true or false and whether II is true or false and click on the corresponding True and False oval spaces. If, but only if, statement II is a correct explanation of statement I, click on the oval space labeled CE.

Assertions (I)
Reasons (II)
Isotopes of an element have same chemical properties
BECAUSE
they have same atomic mass.

 
True
False
CE
Please type your answer before submitting.

Can someone explain this question ? Isotopes of an element have same chemical properties because of same valence electron configuration