NCERT Solution
Class 11
Chemistry
Some Basic Concepts of Chemistry
how many significant figures should be present in...

Question:
How many significant figures should be present in the answer of the following calculations?

(i)

(ii) 5 × 5.364

(iii) 0.0125 + 0.7864 + 0.0215

Answer:

Rules for determining the significant figures

In addition or subtraction of the numbers having different precisions, the final result should be reported to the same number of decimal places as in the term having least number of decimal places

(i) = 1.648

Least precise number of calculation = 298.15

Number of significant figures in the answer

= Number of significant figures in the least precise number = 2 i.e 1.65

(ii) 5 × 5.364 = 26.820

Least precise number of calculation = 5.364

Number of significant figures in the answer = Number of significant figures in 5.364 = 3 i.e 26.820

(iii) 0.0125 + 0.7864 + 0.0215 = 0.8204

Since the least number of decimal places in each term is four, the number of significant figures in the answer is also 4 i.e 0.8204

1
0
0
Report?

Report a problem on Specifications:

Email id:

Comments

Next Question >

SELECT ex_no,question,question_no,id,chapter FROM question_mgmt as q WHERE courseId='2' AND subId='9' AND ex_no!=0 AND status=1 and id!=1246 ORDER BY views desc, last_viewed_on desc limit 0,10

Popular questions of class 11 Chemistry

The mass of an electron is 9.1 × 10^–31 kg. If its K.E. is 3.0 × 10^–25 J, calculate its wavelength.

Calculate the amount of carbon dioxide that could be produced when

(i) 1 mole of carbon is burnt in air.

(ii) 1 mole of carbon is burnt in 16 g of dioxygen.

(iii) 2 moles of carbon are burnt in 16 g of dioxygen.

Calculate the wavelength of an electron moving with a velocity of 2.05 × 10⁷ ms^–1.

Balance the following redox reactions by ion – electron method :

(a) MnO₄^–(aq) + I^–(aq) → MnO_{2 (s)} + I_2(s) (in basic medium)

(b) MnO₄ ^– (aq) + SO_{2 (g)}→ Mn²⁺ (aq) + HSO₄^– (aq) (in acidic solution)

(d) Cr₂O₇ ^2– + SO_2(g) → Cr³⁺ _(aq) + SO₄^2–(aq) (in acidic solution)

In a process, 701 J of heat is absorbed by a system and 394 J ofwork is done by the system. What is the change in internal energy for the process?

What will be the minimum pressure required to compress 500 dm³ of air at 1 bar to 200 dm³ at 30°C?

In a reaction A + B2 → AB2 Identify the limiting reagent, if any, in the following reaction mixtures.

(i) 300 atoms of A + 200 molecules of B

(ii) 2 mol A + 3 mol B

(iii) 100 atoms of A + 100 molecules of B

(iv) 5 mol A + 2.5 mol B

(v) 2.5 mol A + 5 mol B

At 0°C, the density of a certain oxide of a gas at 2 bar is same as that of dinitrogen at 5 bar. What is the molecular mass of the oxide?

Which one of the following will have largest number of atoms?

(i) 1 g Au (s)

(ii) 1 g Na (s)

(iii) 1 g Li (s)

(iv) 1 g of Cl2(g)

Density of a gas is found to be 5.46 g/dm³ at 27 °C at 2 bar pressure. What will be its density at STP?

SELECT ex_no,question,question_no,id,chapter FROM question_mgmt as q WHERE courseId='2' AND subId='9' AND ex_no!=0 AND status=1 and id!=1246 ORDER BY last_viewed_on desc limit 0,10

Recently Viewed Questions of Class 11 Chemistry

Write chemical reactions to justify that hydrogen peroxide can function as an oxidizing as well as reducing agent.

What are the oxidation number of the underlined elements in each of the following and how do you rationalise your results ?

(a) KI₃

(b) H₂S₄O₆

(d) CH₃CH₂OH

(e) CH₃COOH

Energy of an electron in the ground state of the hydrogen atom is –2.18 × 10^–18 J. Calculate the ionization enthalpy of atomic hydrogen in terms of J mol^–1.

The velocity associated with a proton moving in a potential difference of 1000 V is 4.37 × 10⁵ ms^–1. If the hockey ball of mass 0.1 kg is moving with this velocity, calculate the wavelength associated with this velocity.

In a reaction A + B2 → AB2 Identify the limiting reagent, if any, in the following reaction mixtures.

(i) 300 atoms of A + 200 molecules of B

(ii) 2 mol A + 3 mol B

(iii) 100 atoms of A + 100 molecules of B

(iv) 5 mol A + 2.5 mol B

(v) 2.5 mol A + 5 mol B

Write the conjugate acids for the following Brönsted bases: NH^–₂ , NH₃ and HCOO^–.

What would have happened if the greenhouse gases were totally missing in the earth's atmosphere? Discuss.

Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water.

Discuss the chemistry of Lassaigne's test.

Discuss the pattern of variation in the oxidation states of
(i) B to Tl and (ii) C to Pb.

Question:
How many significant figures should be present in the answer of the following calculations?

(i)

(ii) 5 × 5.364

(iii) 0.0125 + 0.7864 + 0.0215

< Previous Question

Next Question >

Popular questions of class 11 Chemistry

Recently Viewed Questions of Class 11 Chemistry

Comments

Comment(s) on this Question

NCERT Solutions

Quick Links

Resources

Support

Question: How many significant figures should be present in the answer of the following calculations? (i) (ii) 5 × 5.364 (iii) 0.0125 + 0.7864 + 0.0215

< Previous Question

Next Question >

Popular questions of class 11 Chemistry

Recently Viewed Questions of Class 11 Chemistry

Comments

Comment(s) on this Question

NCERT Solutions

Quick Links

Resources

Support

Question:
How many significant figures should be present in the answer of the following calculations?

(i)

(ii) 5 × 5.364

(iii) 0.0125 + 0.7864 + 0.0215