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Correct statements: 

a. There is no scattering of light in the outer space

c. The vision is more accurate and clear

It is a property of metals by virtue of which they can be drawn into thin wire without breaking.

Molecule containing minimum one double or triple bond in its molecules (unsaturated hydrocarbon) shows addition reaction.

As per question C₃H₆, C₂H₂ .

a. A – cathode. 

b. Chemical equation at ‘B’:

2Cl^- → Cl₂ + 2e^-

c. Solution turns pink. Because, after electrolysis K⁺ and OH^- ions are present in the remaining solution. That means KOH, an alkali is formed.

1. In front of retina. Objects can’t be seen clearly.

2. Yes

3. damages are formed in front of retina.

4. This can be overcome by using concave lens of suitable power.

Correct option is D) tie for

The character that will appear in F₁ generation is called as dominant character.

Power of accommodation is the ability of the eye lens to focus near and far objects clearly on the retina by adjusting its focal length with the help of ciliary muscles. 

• In telescope 
• In eye lenses 
• In-camera 
• In the microscope 
• In the magnifying a lenses

(a)  A white precipitate is sedimentate at the bottom of test tube. 

(b)  Na2SO₄ (aq) + BaCl₂ (aq) → BaSO₄ ↓(s) + 2NaCl (aq)

The doctor indicated about the type and power of lens.

Given f =  +15 cm, u = – 10 cm, v = ?

By mirror formula

1/v + 1/10 = 1/15 …. (i)

Put the given values in eq. (i) with their sign conventions 

1/v - 1/10 = 15

We get, v = 6 cm

image is formed at 6 cm away from the mirror on right side i.e. virtual

m = –v/u  =  –6/-10  = 0.6

Here, m is less than unity and also positive so image will be diminished, erect and virtual in nature. 

A ratio is an ordered pair of numbers a and b, written a / b where b does not equal 0. A proportion is an equation in which two ratios are set equal to each other. 

(a)  CO₂ 

(b)  A must be a metal carbonate. CaCO₃(s) + 2HCl → CaCl₂(s) + H₂O(l) + CO₂↑

Importance of DNA copying in reproduction : 

– Due to DNA copying during reproduction parental characters are transferred to progeny.

– DNA copying allows, equal separation and distribution of DNA in offspring. 

Respiratory pigment present in our blood – Haemoglobin. 

Function : haemoglobin binds with oxygen and helps in transport of oxygen to the tissues. 

Addition of acid with base to forms salt & water is neutralisation.

Reaction 1  NaOH + HNO₃ → NaNO₃ + H₂O

Reaction 2  NaOH + HCl → NaCl + H₂O

Time period :

The correct answer is Vatican City.

• Vatican City-
  • It is located in the continent of Vatican City Europe, this country is considered to be the smallest country in the world.
  • The population of this country, settled in an area of ​​only 44 hectares, is only 840.
• Tuvalu-
  • It (formerly Ellis Island) is a Polynesian island country located between Hawaii and Australia in the Pacific Ocean.
  • Its nearest countries are Kiribati, Samoa, and Fiji.
  • It is located in the South Pacific Ocean, Tuvalu is 4.6 meters above sea level and has a population of 11,000.
  • The island of Tuvalu is the fourth-smallest country in the world by area.
  • Funafuti is the capital of Tuvalu.
• The city of San Marino is the capital of the "Republic of San Marino" of Southern Europe.
• Nauru-
  • It is the world's smallest island country located in the Pacific Ocean near the Marshall Islands.
  • Its official name is "Nauru Republic".

Correct option is (B) 2KBr + I₂ → 2KI + Br₂

As we know the oxidizing power of halogens decrease as we move from top to bottom, it means the order of oxidizing strength will be

F₂ > Cl₂ > Br₂ > I₂

 ∵ Br₂ is more powerful oxidizing agent than I₂ it means I₂ can not reduce Br^- to Br₂.

∴ 2KBr  + I₂ → KI + Br₂ is not a feasible reaction.

Vertical velocity of ball  uy​=v1​

Horizontal velocity of ball  ux​=v2​

Horizontal range of projectile   R=2ux​uy​​/g

⟹ R=

2v1​v2​​/g = 2* 10*8/ 10= 16 m

Horizontal velocity of ball is trolley

S = u_Ht

R = u_Ht

S_g = u_gt - \(\frac12\)a_gt²

S_y = 0

u_yt - \(\frac12\)gt² = 0

u_yt = \(\frac12\)gt²

u_y = \(\frac{gt}2\)

t = \(\frac{2u_y}g\) 

t = \(\frac{2\times10}{10}\) 

t = 2 sec

Range observed by him is

Given u_H = 8m/s

R = u_Ht

R = 8 x 2

R = 16 m

Correct option: d. Deoxyribose sugar

Given:

One man and one Woman together can complete a piece of work = 12 days

A man can complete the work = 30 days

Concept used:

Total work = LCM

Formula used:

Efficiency = Work/Time

Calculation

Let efficiency of a man and a woman be M and F respectively

Total efficiency of a man and a woman = M + F

Work done a man and a woman in 12 days = 12(M + F)

Total work done a man in 30 days = 30M

According to the question,

⇒ 12(M + F) = 30M

⇒ 12 M + 12F = 30 M

⇒ 12F = 18 M

⇒ F ∶ M = 3 ∶ 2

Total work = total efficiency × together work done

Total work = 5 × 12 = 60

One woman completes the work = 60/3 = 20 days

∴ One woman completes the work in 20 days 

Correct option (3)  Alanine

In formic acid solution, millimole of COOH₂ = Molarity x Volume(ml)
                                              = 0.1 x 500
                                              = 50
  So, Millimole of H⁺ in COOH₂ = 2 x 50
In H₂SO4 solution, millimole of H₂SO₄ = 0.05 x 1500
                                                        = 75
  So, millimole of H⁺ in H₂SO₄ = 2 x 75
Total millimole of H⁺ = (100+150) = 250
Total volume of mixture = 1500+500 = 2000ml.
final concentration of H⁺ = 250/2000
                                   0.125 M
So, final pH= -log[H⁺] = -log(0.125)

= 0.90

Silver chloride form a soluble complex with aqueous ammonia

AgCl + 2NH₃ → [Ag(NH₃)₂]Cl

so silver chloride is more soluble in aqueous ammonia.

(c) Reverse osmosis

In Emerson’s first effect, the photosynthetic yield was dropped in the region above 600 nm.

When conc. H₂SO₄ is added to dry KNO₃, brown fumes are evolved. These fumes are of NO₂.

When orthoboric acid is heated strongly, it gives B₂O₃ .

Pyrene (a fire extinguisher)is CCl₄ .

Multiplying equation (1) and (2) each by 6 reversing (3), we get, 

6C_(graphite) + 6O_2(g) → 6CO_2(g); ΔH = -2370 kJ …(4) 

6H_2(g) + 3O_2(g) → 6H₂O(l); ΔH = -1616.4 kJ … (5) 

C₆H₁₂O_6(s) → 6C_(graphite) + 3O_2(g) ; ΔH = +1169.8 kJ …..(6) 

Adding (4), (5) and (6), 

C₆H₁₂O_6(s) +6O_2(g) → 6CO_2(g) +6H₂O_(g) ; 

ΔHg (C₆H₁₂O₆) = -2370.0 – 1616.4 + 1169.8 = -2816.6 k

(b) The order of boiling points of the group 15 hydrides is : BiH₃ > SbH₃ > NH₃ > AsH₃ > PH₃

 (a) Oxide in which central atom has higher charge and more electronegativity is more acidic,

 i.e. N₂O₅ > N₂O₄ > P₂O₅ > As₂O₃ .

 (a) Order of dipole moment NH₃ > PH₃ > AsH₃ > SbH₃ (Based upon electronegativity)